Replace gnu::unique_ptr with std::unique_ptr

  Now that GCC is compiled as C++11 there is no need to keep the C++03
implementation of gnu::unique_ptr.

This removes the unique-ptr.h header and replaces it with <memory> in
system.h, and changes the INCLUDE_UNIQUE_PTR macro to INCLUDE_MEMORY.
Uses of gnu::unique_ptr and gnu::move can be replaced with
std::unique_ptr and std::move. There are no uses of unique_xmalloc_ptr
or xmalloc_deleter in GCC.


Bootstrapped and tested on powerpc64le-linux. OK for trunk?



gcc/analyzer/ChangeLog:

	* engine.cc: Define INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR.

gcc/c-family/ChangeLog:

	* known-headers.cc: Define INCLUDE_MEMORY instead of
	INCLUDE_UNIQUE_PTR.
	* name-hint.h: Likewise.
	(class name_hint): Use std::unique_ptr instead of gnu::unique_ptr.

gcc/c/ChangeLog:

	* c-decl.c: Define INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR.
	* c-parser.c: Likewise.

gcc/cp/ChangeLog:

	* error.c: Define INCLUDE_MEMORY instead of
	INCLUDE_UNIQUE_PTR.
	* lex.c: Likewise.
	* name-lookup.c: Likewise.
	(class namespace_limit_reached): Use std::unique_ptr instead of
	gnu::unique_ptr.
	(suggest_alternatives_for): Use std::move instead of gnu::move.
	(suggest_alternatives_in_other_namespaces): Likewise.
	* parser.c: Define INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR.

gcc/ChangeLog:

	* Makefile.in: Remove unique-ptr-tests.o.
	* selftest-run-tests.c (selftest::run_tests): Remove
	unique_ptr_tests_cc_tests.
	* selftest.h (unique_ptr_tests_cc_tests): Remove.
	* system.h: Check INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR
	and include <memory> instead of "unique-ptr.h".
	* unique-ptr-tests.cc: Removed.

include/ChangeLog:

	* unique-ptr.h: Removed.
---
 gcc/Makefile.in               |   1 -
 gcc/analyzer/engine.cc        |   2 +-
 gcc/c-family/known-headers.cc |   2 +-
 gcc/c-family/name-hint.h      |  12 +-
 gcc/c/c-decl.c                |   2 +-
 gcc/c/c-parser.c              |   2 +-
 gcc/cp/error.c                |   2 +-
 gcc/cp/lex.c                  |   2 +-
 gcc/cp/name-lookup.c          |  10 +-
 gcc/cp/parser.c               |   2 +-
 gcc/selftest-run-tests.c      |   1 -
 gcc/selftest.h                |   1 -
 gcc/system.h                  |   8 +-
 gcc/unique-ptr-tests.cc       | 236 --------------------
 include/unique-ptr.h          | 405 ----------------------------------
 15 files changed, 21 insertions(+), 667 deletions(-)
 delete mode 100644 gcc/unique-ptr-tests.cc
 delete mode 100644 include/unique-ptr.h
  

On Tue, Nov 09, 2021 at 05:51:27PM +0000, Jonathan Wakely via Gcc-patches wrote:
> Now that GCC is compiled as C++11 there is no need to keep the C++03
> implementation of gnu::unique_ptr.
> 
> This removes the unique-ptr.h header and replaces it with <memory> in
> system.h, and changes the INCLUDE_UNIQUE_PTR macro to INCLUDE_MEMORY.
> Uses of gnu::unique_ptr and gnu::move can be replaced with
> std::unique_ptr and std::move. There are no uses of unique_xmalloc_ptr
> or xmalloc_deleter in GCC.
> 
> 
> Bootstrapped and tested on powerpc64le-linux. OK for trunk?
> 
> 
> 
> gcc/analyzer/ChangeLog:
> 
> 	* engine.cc: Define INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR.
> 
> gcc/c-family/ChangeLog:
> 
> 	* known-headers.cc: Define INCLUDE_MEMORY instead of
> 	INCLUDE_UNIQUE_PTR.
> 	* name-hint.h: Likewise.
> 	(class name_hint): Use std::unique_ptr instead of gnu::unique_ptr.
> 
> gcc/c/ChangeLog:
> 
> 	* c-decl.c: Define INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR.
> 	* c-parser.c: Likewise.
> 
> gcc/cp/ChangeLog:
> 
> 	* error.c: Define INCLUDE_MEMORY instead of
> 	INCLUDE_UNIQUE_PTR.
> 	* lex.c: Likewise.
> 	* name-lookup.c: Likewise.
> 	(class namespace_limit_reached): Use std::unique_ptr instead of
> 	gnu::unique_ptr.
> 	(suggest_alternatives_for): Use std::move instead of gnu::move.
> 	(suggest_alternatives_in_other_namespaces): Likewise.
> 	* parser.c: Define INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR.
> 
> gcc/ChangeLog:
> 
> 	* Makefile.in: Remove unique-ptr-tests.o.
> 	* selftest-run-tests.c (selftest::run_tests): Remove
> 	unique_ptr_tests_cc_tests.
> 	* selftest.h (unique_ptr_tests_cc_tests): Remove.
> 	* system.h: Check INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR
> 	and include <memory> instead of "unique-ptr.h".
> 	* unique-ptr-tests.cc: Removed.
> 
> include/ChangeLog:
> 
> 	* unique-ptr.h: Removed.

LGTM.

	Jakub
  

Ping

On 09/11/21 17:51 +0000, Jonathan Wakely wrote:
>Now that GCC is compiled as C++11 there is no need to keep the C++03
>implementation of gnu::unique_ptr.
>
>This removes the unique-ptr.h header and replaces it with <memory> in
>system.h, and changes the INCLUDE_UNIQUE_PTR macro to INCLUDE_MEMORY.
>Uses of gnu::unique_ptr and gnu::move can be replaced with
>std::unique_ptr and std::move. There are no uses of unique_xmalloc_ptr
>or xmalloc_deleter in GCC.
>
>
>Bootstrapped and tested on powerpc64le-linux. OK for trunk?
>
>
>
>gcc/analyzer/ChangeLog:
>
>	* engine.cc: Define INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR.
>
>gcc/c-family/ChangeLog:
>
>	* known-headers.cc: Define INCLUDE_MEMORY instead of
>	INCLUDE_UNIQUE_PTR.
>	* name-hint.h: Likewise.
>	(class name_hint): Use std::unique_ptr instead of gnu::unique_ptr.
>
>gcc/c/ChangeLog:
>
>	* c-decl.c: Define INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR.
>	* c-parser.c: Likewise.
>
>gcc/cp/ChangeLog:
>
>	* error.c: Define INCLUDE_MEMORY instead of
>	INCLUDE_UNIQUE_PTR.
>	* lex.c: Likewise.
>	* name-lookup.c: Likewise.
>	(class namespace_limit_reached): Use std::unique_ptr instead of
>	gnu::unique_ptr.
>	(suggest_alternatives_for): Use std::move instead of gnu::move.
>	(suggest_alternatives_in_other_namespaces): Likewise.
>	* parser.c: Define INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR.
>
>gcc/ChangeLog:
>
>	* Makefile.in: Remove unique-ptr-tests.o.
>	* selftest-run-tests.c (selftest::run_tests): Remove
>	unique_ptr_tests_cc_tests.
>	* selftest.h (unique_ptr_tests_cc_tests): Remove.
>	* system.h: Check INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR
>	and include <memory> instead of "unique-ptr.h".
>	* unique-ptr-tests.cc: Removed.
>
>include/ChangeLog:
>
>	* unique-ptr.h: Removed.
>---
> gcc/Makefile.in               |   1 -
> gcc/analyzer/engine.cc        |   2 +-
> gcc/c-family/known-headers.cc |   2 +-
> gcc/c-family/name-hint.h      |  12 +-
> gcc/c/c-decl.c                |   2 +-
> gcc/c/c-parser.c              |   2 +-
> gcc/cp/error.c                |   2 +-
> gcc/cp/lex.c                  |   2 +-
> gcc/cp/name-lookup.c          |  10 +-
> gcc/cp/parser.c               |   2 +-
> gcc/selftest-run-tests.c      |   1 -
> gcc/selftest.h                |   1 -
> gcc/system.h                  |   8 +-
> gcc/unique-ptr-tests.cc       | 236 --------------------
> include/unique-ptr.h          | 405 ----------------------------------
> 15 files changed, 21 insertions(+), 667 deletions(-)
> delete mode 100644 gcc/unique-ptr-tests.cc
> delete mode 100644 include/unique-ptr.h
>
>diff --git a/gcc/Makefile.in b/gcc/Makefile.in
>index 571e9c28e29..1e8e4449ffb 100644
>--- a/gcc/Makefile.in
>+++ b/gcc/Makefile.in
>@@ -1693,7 +1693,6 @@ OBJS = \
> 	tree.o \
> 	tristate.o \
> 	typed-splay-tree.o \
>-	unique-ptr-tests.o \
> 	valtrack.o \
> 	value-pointer-equiv.o \
> 	value-query.o \
>diff --git a/gcc/analyzer/engine.cc b/gcc/analyzer/engine.cc
>index f21f8e5b78a..1312741bb47 100644
>--- a/gcc/analyzer/engine.cc
>+++ b/gcc/analyzer/engine.cc
>@@ -19,7 +19,7 @@ along with GCC; see the file COPYING3.  If not see
> <http://www.gnu.org/licenses/>.  */
>
> #include "config.h"
>-#define INCLUDE_UNIQUE_PTR
>+#define INCLUDE_MEMORY
> #include "system.h"
> #include "coretypes.h"
> #include "tree.h"
>diff --git a/gcc/c-family/known-headers.cc b/gcc/c-family/known-headers.cc
>index a3912468a8d..572cca177fa 100644
>--- a/gcc/c-family/known-headers.cc
>+++ b/gcc/c-family/known-headers.cc
>@@ -18,7 +18,7 @@ along with GCC; see the file COPYING3.  If not see
> <http://www.gnu.org/licenses/>.  */
>
> #include "config.h"
>-#define INCLUDE_UNIQUE_PTR
>+#define INCLUDE_MEMORY
> #include "system.h"
> #include "coretypes.h"
> #include "c-family/c-common.h"
>diff --git a/gcc/c-family/name-hint.h b/gcc/c-family/name-hint.h
>index ea433243ba4..3141552ea59 100644
>--- a/gcc/c-family/name-hint.h
>+++ b/gcc/c-family/name-hint.h
>@@ -20,12 +20,12 @@ along with GCC; see the file COPYING3.  If not see
> #ifndef GCC_NAME_HINT_H
> #define GCC_NAME_HINT_H
>
>-/* This header uses gnu::unique_ptr, but unique-ptr.h can't be directly
>+/* This header uses std::unique_ptr, but <memory> can't be directly
>    included due to issues with macros.  Hence it must be included from
>-   system.h by defining INCLUDE_UNIQUE_PTR in any source file using it.  */
>+   system.h by defining INCLUDE_MEMORY in any source file using it.  */
>
>-#ifndef GNU_UNIQUE_PTR_H
>-# error "You must define INCLUDE_UNIQUE_PTR before including system.h to use name-hint.h"
>+#ifndef INCLUDE_MEMORY
>+# error "You must define INCLUDE_MEMORY before including system.h to use name-hint.h"
> #endif
>
> enum lookup_name_fuzzy_kind {
>@@ -106,7 +106,7 @@ public:
>
>   /* Take ownership of this name_hint's deferred_diagnostic, for use
>      in chaining up deferred diagnostics.  */
>-  gnu::unique_ptr<deferred_diagnostic> take_deferred () { return move (m_deferred); }
>+  std::unique_ptr<deferred_diagnostic> take_deferred () { return move (m_deferred); }
>
>   /* Call this on a name_hint if the corresponding warning was not emitted,
>      in which case we should also not emit the deferred_diagnostic.  */
>@@ -119,7 +119,7 @@ public:
>
> private:
>   const char *m_suggestion;
>-  gnu::unique_ptr<deferred_diagnostic> m_deferred;
>+  std::unique_ptr<deferred_diagnostic> m_deferred;
> };
>
> extern name_hint lookup_name_fuzzy (tree, enum lookup_name_fuzzy_kind,
>diff --git a/gcc/c/c-decl.c b/gcc/c/c-decl.c
>index 186fa1692c1..603c1e05dd3 100644
>--- a/gcc/c/c-decl.c
>+++ b/gcc/c/c-decl.c
>@@ -26,7 +26,7 @@ along with GCC; see the file COPYING3.  If not see
>
> #include "config.h"
> #define INCLUDE_STRING
>-#define INCLUDE_UNIQUE_PTR
>+#define INCLUDE_MEMORY
> #include "system.h"
> #include "coretypes.h"
> #include "target.h"
>diff --git a/gcc/c/c-parser.c b/gcc/c/c-parser.c
>index 80dd61d599e..ff5b89abfde 100644
>--- a/gcc/c/c-parser.c
>+++ b/gcc/c/c-parser.c
>@@ -36,7 +36,7 @@ along with GCC; see the file COPYING3.  If not see
>    location rather than implicitly using input_location.  */
>
> #include "config.h"
>-#define INCLUDE_UNIQUE_PTR
>+#define INCLUDE_MEMORY
> #include "system.h"
> #include "coretypes.h"
> #include "target.h"
>diff --git a/gcc/cp/error.c b/gcc/cp/error.c
>index 012a4ecddf4..3e420aba3ba 100644
>--- a/gcc/cp/error.c
>+++ b/gcc/cp/error.c
>@@ -19,7 +19,7 @@ along with GCC; see the file COPYING3.  If not see
>
> #include "config.h"
> /* For use with name_hint.  */
>-#define INCLUDE_UNIQUE_PTR
>+#define INCLUDE_MEMORY
> #include "system.h"
> #include "coretypes.h"
> #include "cp-tree.h"
>diff --git a/gcc/cp/lex.c b/gcc/cp/lex.c
>index 43abd019e6e..06de6cfe3b3 100644
>--- a/gcc/cp/lex.c
>+++ b/gcc/cp/lex.c
>@@ -23,7 +23,7 @@ along with GCC; see the file COPYING3.  If not see
>
> #include "config.h"
> /* For use with name_hint.  */
>-#define INCLUDE_UNIQUE_PTR
>+#define INCLUDE_MEMORY
> #include "system.h"
> #include "coretypes.h"
> #include "cp-tree.h"
>diff --git a/gcc/cp/name-lookup.c b/gcc/cp/name-lookup.c
>index 035bcf51278..5be332569eb 100644
>--- a/gcc/cp/name-lookup.c
>+++ b/gcc/cp/name-lookup.c
>@@ -19,7 +19,7 @@ along with GCC; see the file COPYING3.  If not see
> <http://www.gnu.org/licenses/>.  */
>
> #include "config.h"
>-#define INCLUDE_UNIQUE_PTR
>+#define INCLUDE_MEMORY
> #include "system.h"
> #include "coretypes.h"
> #include "cp-tree.h"
>@@ -6383,7 +6383,7 @@ class namespace_limit_reached : public deferred_diagnostic
> {
>  public:
>   namespace_limit_reached (location_t loc, unsigned limit, tree name,
>-			   gnu::unique_ptr<deferred_diagnostic> wrapped)
>+			   std::unique_ptr<deferred_diagnostic> wrapped)
>   : deferred_diagnostic (loc),
>     m_limit (limit), m_name (name),
>     m_wrapped (move (wrapped))
>@@ -6403,7 +6403,7 @@ class namespace_limit_reached : public deferred_diagnostic
>  private:
>   unsigned m_limit;
>   tree m_name;
>-  gnu::unique_ptr<deferred_diagnostic> m_wrapped;
>+  std::unique_ptr<deferred_diagnostic> m_wrapped;
> };
>
> /* Subclass of deferred_diagnostic, for use when issuing a single suggestion.
>@@ -6647,7 +6647,7 @@ suggest_alternatives_for (location_t location, tree name,
>   if (!result)
>     result = suggest_alternatives_for_1 (location, name, suggest_misspellings);
>
>-  return ns_hints.maybe_decorate_with_limit (gnu::move (result));
>+  return ns_hints.maybe_decorate_with_limit (std::move (result));
> }
>
> /* The second half of suggest_alternatives_for, for when no exact matches
>@@ -6692,7 +6692,7 @@ suggest_alternatives_in_other_namespaces (location_t location, tree name)
>
>   name_hint result = ns_hints.convert_candidates_to_name_hint ();
>
>-  return ns_hints.maybe_decorate_with_limit (gnu::move (result));
>+  return ns_hints.maybe_decorate_with_limit (std::move (result));
> }
>
> /* A well-known name within the C++ standard library, returned by
>diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
>index 32de97b08bd..a678340d67d 100644
>--- a/gcc/cp/parser.c
>+++ b/gcc/cp/parser.c
>@@ -19,7 +19,7 @@ along with GCC; see the file COPYING3.  If not see
> <http://www.gnu.org/licenses/>.  */
>
> #include "config.h"
>-#define INCLUDE_UNIQUE_PTR
>+#define INCLUDE_MEMORY
> #include "system.h"
> #include "coretypes.h"
> #include "cp-tree.h"
>diff --git a/gcc/selftest-run-tests.c b/gcc/selftest-run-tests.c
>index 6a8f291f5dd..8eb1239b59c 100644
>--- a/gcc/selftest-run-tests.c
>+++ b/gcc/selftest-run-tests.c
>@@ -71,7 +71,6 @@ selftest::run_tests ()
>   sreal_c_tests ();
>   fibonacci_heap_c_tests ();
>   typed_splay_tree_c_tests ();
>-  unique_ptr_tests_cc_tests ();
>   opt_proposer_c_tests ();
>   opts_c_tests ();
>   json_cc_tests ();
>diff --git a/gcc/selftest.h b/gcc/selftest.h
>index 24ef57cb6cc..e6c7fc35afa 100644
>--- a/gcc/selftest.h
>+++ b/gcc/selftest.h
>@@ -262,7 +262,6 @@ extern void tree_cfg_c_tests ();
> extern void tree_diagnostic_path_cc_tests ();
> extern void tristate_cc_tests ();
> extern void typed_splay_tree_c_tests ();
>-extern void unique_ptr_tests_cc_tests ();
> extern void vec_c_tests ();
> extern void vec_perm_indices_c_tests ();
> extern void wide_int_cc_tests ();
>diff --git a/gcc/system.h b/gcc/system.h
>index 4ac656c9c3c..2cd201743c3 100644
>--- a/gcc/system.h
>+++ b/gcc/system.h
>@@ -737,12 +737,10 @@ extern int vsnprintf (char *, size_t, const char *, va_list);
>
> /* Some of the headers included by <memory> can use "abort" within a
>    namespace, e.g. "_VSTD::abort();", which fails after we use the
>-   preprocessor to redefine "abort" as "fancy_abort" below.
>-   Given that unique-ptr.h can use "free", we need to do this after "free"
>-   is declared but before "abort" is overridden.  */
>+   preprocessor to redefine "abort" as "fancy_abort" below.  */
>
>-#ifdef INCLUDE_UNIQUE_PTR
>-# include "unique-ptr.h"
>+#ifdef INCLUDE_MEMORY
>+# include <memory>
> #endif
>
> #ifdef INCLUDE_MALLOC_H
>diff --git a/gcc/unique-ptr-tests.cc b/gcc/unique-ptr-tests.cc
>deleted file mode 100644
>index 975dd57398e..00000000000
>--- a/gcc/unique-ptr-tests.cc
>+++ /dev/null
>@@ -1,236 +0,0 @@
>-/* Unit tests for unique-ptr.h.
>-   Copyright (C) 2017-2021 Free Software Foundation, Inc.
>-
>-This file is part of GCC.
>-
>-GCC is free software; you can redistribute it and/or modify it under
>-the terms of the GNU General Public License as published by the Free
>-Software Foundation; either version 3, or (at your option) any later
>-version.
>-
>-GCC is distributed in the hope that it will be useful, but WITHOUT ANY
>-WARRANTY; without even the implied warranty of MERCHANTABILITY or
>-FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
>-for more details.
>-
>-You should have received a copy of the GNU General Public License
>-along with GCC; see the file COPYING3.  If not see
>-<http://www.gnu.org/licenses/>.  */
>-
>-#include "config.h"
>-#define INCLUDE_UNIQUE_PTR
>-#include "system.h"
>-#include "coretypes.h"
>-#include "selftest.h"
>-
>-#if CHECKING_P
>-
>-namespace selftest {
>-
>-namespace {
>-
>-/* A class for counting ctor and dtor invocations.  */
>-
>-class stats
>-{
>-public:
>-  stats () : ctor_count (0), dtor_count (0) {}
>-
>-  int ctor_count;
>-  int dtor_count;
>-};
>-
>-/* A class that uses "stats" to track its ctor and dtor invocations.  */
>-
>-class foo
>-{
>-public:
>-  foo (stats &s) : m_s (s) { ++m_s.ctor_count; }
>-  ~foo () { ++m_s.dtor_count; }
>-
>-  int example_method () const { return 42; }
>-
>-private:
>-  foo (const foo&);
>-  foo & operator= (const foo &);
>-
>-private:
>-  stats &m_s;
>-};
>-
>-/* A struct for testing unique_ptr<T[]>.  */
>-
>-class has_default_ctor
>-{
>-public:
>-  has_default_ctor () : m_field (42) {}
>-  int m_field;
>-};
>-
>-/* A dummy struct for testing unique_xmalloc_ptr.  */
>-
>-struct dummy
>-{
>-  int field;
>-};
>-
>-} // anonymous namespace
>-
>-/* Verify that the default ctor inits ptrs to NULL.  */
>-
>-static void
>-test_null_ptr ()
>-{
>-  gnu::unique_ptr<void *> p;
>-  ASSERT_EQ (NULL, p);
>-
>-  gnu::unique_xmalloc_ptr<void *> q;
>-  ASSERT_EQ (NULL, q);
>-}
>-
>-/* Verify that deletion happens when a unique_ptr goes out of scope.  */
>-
>-static void
>-test_implicit_deletion ()
>-{
>-  stats s;
>-  ASSERT_EQ (0, s.ctor_count);
>-  ASSERT_EQ (0, s.dtor_count);
>-
>-  {
>-    gnu::unique_ptr<foo> f (new foo (s));
>-    ASSERT_NE (NULL, f);
>-    ASSERT_EQ (1, s.ctor_count);
>-    ASSERT_EQ (0, s.dtor_count);
>-  }
>-
>-  /* Verify that the foo was implicitly deleted.  */
>-  ASSERT_EQ (1, s.ctor_count);
>-  ASSERT_EQ (1, s.dtor_count);
>-}
>-
>-/* Verify that we can assign to a NULL unique_ptr.  */
>-
>-static void
>-test_overwrite_of_null ()
>-{
>-  stats s;
>-  ASSERT_EQ (0, s.ctor_count);
>-  ASSERT_EQ (0, s.dtor_count);
>-
>-  {
>-    gnu::unique_ptr<foo> f;
>-    ASSERT_EQ (NULL, f);
>-    ASSERT_EQ (0, s.ctor_count);
>-    ASSERT_EQ (0, s.dtor_count);
>-
>-    /* Overwrite with a non-NULL value.  */
>-    f = gnu::unique_ptr<foo> (new foo (s));
>-    ASSERT_EQ (1, s.ctor_count);
>-    ASSERT_EQ (0, s.dtor_count);
>-  }
>-
>-  /* Verify that the foo is implicitly deleted.  */
>-  ASSERT_EQ (1, s.ctor_count);
>-  ASSERT_EQ (1, s.dtor_count);
>-}
>-
>-/* Verify that we can assign to a non-NULL unique_ptr.  */
>-
>-static void
>-test_overwrite_of_non_null ()
>-{
>-  stats s;
>-  ASSERT_EQ (0, s.ctor_count);
>-  ASSERT_EQ (0, s.dtor_count);
>-
>-  {
>-    gnu::unique_ptr<foo> f (new foo (s));
>-    ASSERT_NE (NULL, f);
>-    ASSERT_EQ (1, s.ctor_count);
>-    ASSERT_EQ (0, s.dtor_count);
>-
>-    /* Overwrite with a different value.  */
>-    f = gnu::unique_ptr<foo> (new foo (s));
>-    ASSERT_EQ (2, s.ctor_count);
>-    ASSERT_EQ (1, s.dtor_count);
>-  }
>-
>-  /* Verify that the 2nd foo was implicitly deleted.  */
>-  ASSERT_EQ (2, s.ctor_count);
>-  ASSERT_EQ (2, s.dtor_count);
>-}
>-
>-/* Verify that unique_ptr's overloaded ops work.  */
>-
>-static void
>-test_overloaded_ops ()
>-{
>-  stats s;
>-  gnu::unique_ptr<foo> f (new foo (s));
>-  ASSERT_EQ (42, f->example_method ());
>-  ASSERT_EQ (42, (*f).example_method ());
>-  ASSERT_EQ (f, f);
>-  ASSERT_NE (NULL, f.get ());
>-
>-  gnu::unique_ptr<foo> g (new foo (s));
>-  ASSERT_NE (f, g);
>-}
>-
>-/* Verify that the gnu::unique_ptr specialization for T[] works.  */
>-
>-static void
>-test_array_new ()
>-{
>-  const int num = 10;
>-  gnu::unique_ptr<has_default_ctor[]> p (new has_default_ctor[num]);
>-  ASSERT_NE (NULL, p.get ());
>-  /* Verify that operator[] works, and that the default ctor was called
>-     on each element.  */
>-  for (int i = 0; i < num; i++)
>-    ASSERT_EQ (42, p[i].m_field);
>-}
>-
>-/* Verify that gnu::unique_xmalloc_ptr works.  */
>-
>-static void
>-test_xmalloc ()
>-{
>-  gnu::unique_xmalloc_ptr<dummy> p (XNEW (dummy));
>-  ASSERT_NE (NULL, p.get ());
>-}
>-
>-/* Verify the gnu::unique_xmalloc_ptr specialization for T[].  */
>-
>-static void
>-test_xmalloc_array ()
>-{
>-  const int num = 10;
>-  gnu::unique_xmalloc_ptr<dummy[]> p (XNEWVEC (dummy, num));
>-  ASSERT_NE (NULL, p.get ());
>-
>-  /* Verify that operator[] works.  */
>-  for (int i = 0; i < num; i++)
>-    p[i].field = 42;
>-  for (int i = 0; i < num; i++)
>-    ASSERT_EQ (42, p[i].field);
>-}
>-
>-/* Run all of the selftests within this file.  */
>-
>-void
>-unique_ptr_tests_cc_tests ()
>-{
>-  test_null_ptr ();
>-  test_implicit_deletion ();
>-  test_overwrite_of_null ();
>-  test_overwrite_of_non_null ();
>-  test_overloaded_ops ();
>-  test_array_new ();
>-  test_xmalloc ();
>-  test_xmalloc_array ();
>-}
>-
>-} // namespace selftest
>-
>-#endif /* #if CHECKING_P */
>diff --git a/include/unique-ptr.h b/include/unique-ptr.h
>deleted file mode 100644
>index d1b2ba5b62d..00000000000
>--- a/include/unique-ptr.h
>+++ /dev/null
>@@ -1,405 +0,0 @@
>-/* gnu::unique_ptr, a simple std::unique_ptr replacement for C++03.
>-
>-   Copyright (C) 2007-2021 Free Software Foundation, Inc.
>-
>-   This file is part of GCC.
>-
>-   This program is free software; you can redistribute it and/or modify
>-   it under the terms of the GNU General Public License as published by
>-   the Free Software Foundation; either version 3 of the License, or
>-   (at your option) any later version.
>-
>-   This program is distributed in the hope that it will be useful,
>-   but WITHOUT ANY WARRANTY; without even the implied warranty of
>-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>-   GNU General Public License for more details.
>-
>-   You should have received a copy of the GNU General Public License
>-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
>-
>-/* gnu::unique_ptr defines a C++ owning smart pointer that exposes a
>-   subset of the std::unique_ptr API.
>-
>-   In fact, when compiled with a C++11 compiler, gnu::unique_ptr
>-   actually _is_ std::unique_ptr.  When compiled with a C++03 compiler
>-   OTOH, it's an hand coded std::unique_ptr emulation that assumes
>-   code is correct and doesn't try to be too smart.
>-
>-   This supports custom deleters, but not _stateful_ deleters, so you
>-   can't use those in C++11 mode either.  Only the managed pointer is
>-   stored in the smart pointer.  That could be changed; it simply
>-   wasn't found necessary.
>-
>-   At the end of the file you'll find a gnu::unique_ptr partial
>-   specialization that uses a custom (stateless) deleter:
>-   gnu::unique_xmalloc_ptr.  That is used to manage pointers to
>-   objects allocated with xmalloc.
>-
>-   The C++03 version was originally based on GCC 7.0's std::auto_ptr
>-   and then heavily customized to behave more like C++11's
>-   std::unique_ptr, but at this point, it no longer shares much at all
>-   with the original file.  But, that's the history and the reason for
>-   the copyright's starting year.
>-
>-   The C++03 version lets you shoot yourself in the foot, since
>-   similarly to std::auto_ptr, the copy constructor and assignment
>-   operators actually move.  Also, in the name of simplicity, no
>-   effort is spent on using SFINAE to prevent invalid conversions,
>-   etc.  This is not really a problem, because the goal here is to
>-   allow code that would be correct using std::unique_ptr to be
>-   equally correct in C++03 mode, and, just as efficient.  If client
>-   code compiles correctly with a C++11 (or newer) compiler, we know
>-   we're not doing anything invalid by mistake.
>-
>-   Usage notes:
>-
>-   - Putting gnu::unique_ptr in standard containers is not supported,
>-     since C++03 containers are not move-aware (and our emulation
>-     relies on copy actually moving).
>-
>-   - Since there's no nullptr in C++03, gnu::unique_ptr allows
>-     implicit initialization and assignment from NULL instead.
>-
>-   - To check whether there's an associated managed object, all these
>-     work as expected:
>-
>-      if (ptr)
>-      if (!ptr)
>-      if (ptr != NULL)
>-      if (ptr == NULL)
>-      if (NULL != ptr)
>-      if (NULL == ptr)
>-*/
>-
>-#ifndef GNU_UNIQUE_PTR_H
>-#define GNU_UNIQUE_PTR_H 1
>-
>-#if __cplusplus >= 201103
>-# include <memory>
>-#endif
>-
>-namespace gnu
>-{
>-
>-#if __cplusplus >= 201103
>-
>-/* In C++11 mode, all we need is import the standard
>-   std::unique_ptr.  */
>-template<typename T> using unique_ptr = std::unique_ptr<T>;
>-
>-/* Pull in move as well.  */
>-using std::move;
>-
>-#else /* C++11 */
>-
>-/* Default destruction policy used by gnu::unique_ptr when no deleter
>-   is specified.  Uses delete.  */
>-
>-template<typename T>
>-struct default_delete
>-{
>-  void operator () (T *ptr) const { delete ptr; }
>-};
>-
>-/* Specialization for arrays.  Uses delete[].  */
>-
>-template<typename T>
>-struct default_delete<T[]>
>-{
>-  void operator () (T *ptr) const { delete [] ptr; }
>-};
>-
>-namespace detail
>-{
>-/* Type used to support implicit construction from NULL:
>-
>-     gnu::unique_ptr<foo> func (....)
>-     {
>-     return NULL;
>-     }
>-
>-   and assignment from NULL:
>-
>-     gnu::unique_ptr<foo> ptr (....);
>-     ...
>-     ptr = NULL;
>-
>-  It is intentionally not defined anywhere.  */
>-struct nullptr_t;
>-
>-/* Base class of our unique_ptr emulation.  Contains code common to
>-   both unique_ptr<T, D> and unique_ptr<T[], D>.  */
>-
>-template<typename T, typename D>
>-class unique_ptr_base
>-{
>-public:
>-  typedef T *pointer;
>-  typedef T element_type;
>-  typedef D deleter_type;
>-
>-  /* Takes ownership of a pointer.  P is a pointer to an object of
>-     element_type type.  Defaults to NULL.  */
>-  explicit unique_ptr_base (element_type *p = NULL) throw () : m_ptr (p) {}
>-
>-  /* The "move" constructor.  Really a copy constructor that actually
>-     moves.  Even though std::unique_ptr is not copyable, our little
>-     simpler emulation allows it, because:
>-
>-       - There are no rvalue references in C++03.  Our move emulation
>-       instead relies on copy/assignment moving, like std::auto_ptr.
>-       - RVO/NRVO requires an accessible copy constructor
>-  */
>-  unique_ptr_base (const unique_ptr_base &other) throw ()
>-    : m_ptr (const_cast<unique_ptr_base &> (other).release ()) {}
>-
>-  /* Converting "move" constructor.  Really an lvalue ref converting
>-     constructor that actually moves.  This allows constructs such as:
>-
>-      unique_ptr<Derived> func_returning_unique_ptr (.....);
>-      ...
>-      unique_ptr<Base> ptr = func_returning_unique_ptr (.....);
>-  */
>-  template<typename T1, typename D1>
>-  unique_ptr_base (const unique_ptr_base<T1, D1> &other) throw ()
>-    : m_ptr (const_cast<unique_ptr_base<T1, D1> &> (other).release ()) {}
>-
>-  /* The "move" assignment operator.  Really an lvalue ref copy
>-     assignment operator that actually moves.  See comments above.  */
>-  unique_ptr_base &operator= (const unique_ptr_base &other) throw ()
>-  {
>-    reset (const_cast<unique_ptr_base &> (other).release ());
>-    return *this;
>-  }
>-
>-  /* Converting "move" assignment.  Really an lvalue ref converting
>-     copy assignment operator that moves.  See comments above.  */
>-  template<typename T1, typename D1>
>-  unique_ptr_base &operator= (const unique_ptr_base<T1, D1> &other) throw ()
>-  {
>-    reset (const_cast<unique_ptr_base<T1, D1> &> (other).release ());
>-    return *this;
>-  }
>-
>-  /* std::unique_ptr does not allow assignment, except from nullptr.
>-     nullptr doesn't exist in C++03, so we allow assignment from NULL
>-     instead [ptr = NULL;].
>-  */
>-  unique_ptr_base &operator= (detail::nullptr_t *) throw ()
>-  {
>-    reset ();
>-    return *this;
>-  }
>-
>-  ~unique_ptr_base () { call_deleter (); }
>-
>-  /* "explicit operator bool ()" emulation using the safe bool
>-     idiom.  */
>-private:
>-  typedef void (unique_ptr_base::*explicit_operator_bool) () const;
>-  void this_type_does_not_support_comparisons () const {}
>-
>-public:
>-  operator explicit_operator_bool () const
>-  {
>-    return (m_ptr != NULL
>-	    ? &unique_ptr_base::this_type_does_not_support_comparisons
>-	    : 0);
>-  }
>-
>-  element_type *get () const throw () { return m_ptr; }
>-
>-  element_type *release () throw ()
>-  {
>-    pointer tmp = m_ptr;
>-    m_ptr = NULL;
>-    return tmp;
>-  }
>-
>-  void reset (element_type *p = NULL) throw ()
>-  {
>-    if (p != m_ptr)
>-      {
>-	call_deleter ();
>-	m_ptr = p;
>-      }
>-  }
>-
>-private:
>-
>-  /* Call the deleter.  Note we assume the deleter is "stateless".  */
>-  void call_deleter ()
>-  {
>-    D d;
>-
>-    d (m_ptr);
>-  }
>-
>-  element_type *m_ptr;
>-};
>-
>-} /* namespace detail */
>-
>-/* Macro used to create a unique_ptr_base "partial specialization" --
>-   a subclass that uses a specific deleter.  Basically this re-defines
>-   the necessary constructors.  This is necessary because C++03
>-   doesn't support inheriting constructors with "using".  While at it,
>-   we inherit the assignment operator.  TYPE is the name of the type
>-   being defined.  Assumes that 'base_type' is a typedef of the
>-   baseclass TYPE is inheriting from.  */
>-#define DEFINE_GNU_UNIQUE_PTR(TYPE)						\
>-public:									\
>-  explicit TYPE (T *p = NULL) throw ()					\
>-    : base_type (p) {}							\
>-									\
>-  TYPE (const TYPE &other) throw () : base_type (other) {}		\
>-									\
>-  TYPE (detail::nullptr_t *) throw () : base_type (NULL) {}		\
>-									\
>-  template<typename T1, typename D1>					\
>-  TYPE (const detail::unique_ptr_base<T1, D1> &other) throw ()		\
>-    : base_type (other) {}						\
>-									\
>-  using base_type::operator=;
>-
>-/* Define single-object gnu::unique_ptr.  */
>-
>-template <typename T, typename D = default_delete<T> >
>-class unique_ptr : public detail::unique_ptr_base<T, D>
>-{
>-  typedef detail::unique_ptr_base<T, D> base_type;
>-
>-  DEFINE_GNU_UNIQUE_PTR (unique_ptr)
>-
>-public:
>-  /* Dereferencing.  */
>-  T &operator* () const throw () { return *this->get (); }
>-  T *operator-> () const throw () { return this->get (); }
>-};
>-
>-/* Define gnu::unique_ptr specialization for T[].  */
>-
>-template <typename T, typename D>
>-class unique_ptr<T[], D> : public detail::unique_ptr_base<T, D>
>-{
>-  typedef detail::unique_ptr_base<T, D> base_type;
>-
>-  DEFINE_GNU_UNIQUE_PTR (unique_ptr)
>-
>-public:
>-  /* Indexing operator.  */
>-  T &operator[] (size_t i) const { return this->get ()[i]; }
>-};
>-
>-/* Comparison operators.  */
>-
>-template <typename T, typename D,
>-	  typename U, typename E>
>-inline bool
>-operator== (const detail::unique_ptr_base<T, D> &x,
>-	    const detail::unique_ptr_base<U, E> &y)
>-{ return x.get() == y.get(); }
>-
>-template <typename T, typename D,
>-	  typename U, typename E>
>-inline bool
>-operator!= (const detail::unique_ptr_base<T, D> &x,
>-	    const detail::unique_ptr_base<U, E> &y)
>-{ return x.get() != y.get(); }
>-
>-template<typename T, typename D,
>-	 typename U, typename E>
>-inline bool
>-operator< (const detail::unique_ptr_base<T, D> &x,
>-	   const detail::unique_ptr_base<U, E> &y)
>-{ return x.get() < y.get (); }
>-
>-template<typename T, typename D,
>-	 typename U, typename E>
>-inline bool
>-operator<= (const detail::unique_ptr_base<T, D> &x,
>-	    const detail::unique_ptr_base<U, E> &y)
>-{ return !(y < x); }
>-
>-template<typename T, typename D,
>-	 typename U, typename E>
>-inline bool
>-operator> (const detail::unique_ptr_base<T, D> &x,
>-	   const detail::unique_ptr_base<U, E> &y)
>-{ return y < x; }
>-
>-template<typename T, typename D,
>-	 typename U, typename E>
>-inline bool
>-operator>= (const detail::unique_ptr_base<T, D> &x,
>-	    const detail::unique_ptr_base<U, E> &y)
>-{ return !(x < y); }
>-
>-/* std::move "emulation".  This is as simple as it can be -- no
>-   attempt is made to emulate rvalue references.  This relies on T
>-   having move semantics like std::auto_ptr.
>-   I.e., copy/assignment actually moves.  */
>-
>-template<typename T>
>-const T&
>-move (T& v)
>-{
>-  return v;
>-}
>-
>-#endif /* C++11 */
>-
>-/* Define gnu::unique_xmalloc_ptr, a gnu::unique_ptr that manages
>-   xmalloc'ed memory.  */
>-
>-/* The deleter for gnu::unique_xmalloc_ptr.  Uses free.  */
>-template <typename T>
>-struct xmalloc_deleter
>-{
>-  void operator() (T *ptr) const { free (ptr); }
>-};
>-
>-/* Same, for arrays.  */
>-template <typename T>
>-struct xmalloc_deleter<T[]>
>-{
>-  void operator() (T *ptr) const { free (ptr); }
>-};
>-
>-#if __cplusplus >= 201103
>-
>-/* In C++11, we just import the standard unique_ptr to our namespace
>-   with a custom deleter.  */
>-
>-template<typename T> using unique_xmalloc_ptr
>-  = std::unique_ptr<T, xmalloc_deleter<T>>;
>-
>-#else /* C++11 */
>-
>-/* In C++03, we don't have template aliases, so we need to define a
>-   subclass instead, and re-define the constructors, because C++03
>-   doesn't support inheriting constructors either.  */
>-
>-template <typename T>
>-class unique_xmalloc_ptr : public unique_ptr<T, xmalloc_deleter<T> >
>-{
>-  typedef unique_ptr<T, xmalloc_deleter<T> > base_type;
>-
>-  DEFINE_GNU_UNIQUE_PTR (unique_xmalloc_ptr)
>-};
>-
>-/* Define gnu::unique_xmalloc_ptr specialization for T[].  */
>-
>-template <typename T>
>-class unique_xmalloc_ptr<T[]> : public unique_ptr<T[], xmalloc_deleter<T[]> >
>-{
>-  typedef unique_ptr<T[], xmalloc_deleter<T[]> > base_type;
>-
>-  DEFINE_GNU_UNIQUE_PTR (unique_xmalloc_ptr)
>-};
>-
>-#endif /* C++11 */
>-
>-} /* namespace gnu */
>-
>-#endif /* GNU_UNIQUE_PTR_H */
  

On 10/12/21 21:20 +0000, Jonathan Wakely wrote:
>Ping

Oh sorry, Jakub already replied to this (after I mentioned it on IRC)
and approved it. 

Un-ping!


>On 09/11/21 17:51 +0000, Jonathan Wakely wrote:
>>Now that GCC is compiled as C++11 there is no need to keep the C++03
>>implementation of gnu::unique_ptr.
>>
>>This removes the unique-ptr.h header and replaces it with <memory> in
>>system.h, and changes the INCLUDE_UNIQUE_PTR macro to INCLUDE_MEMORY.
>>Uses of gnu::unique_ptr and gnu::move can be replaced with
>>std::unique_ptr and std::move. There are no uses of unique_xmalloc_ptr
>>or xmalloc_deleter in GCC.
>>
>>
>>Bootstrapped and tested on powerpc64le-linux. OK for trunk?
>>
>>
>>
>>gcc/analyzer/ChangeLog:
>>
>>	* engine.cc: Define INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR.
>>
>>gcc/c-family/ChangeLog:
>>
>>	* known-headers.cc: Define INCLUDE_MEMORY instead of
>>	INCLUDE_UNIQUE_PTR.
>>	* name-hint.h: Likewise.
>>	(class name_hint): Use std::unique_ptr instead of gnu::unique_ptr.
>>
>>gcc/c/ChangeLog:
>>
>>	* c-decl.c: Define INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR.
>>	* c-parser.c: Likewise.
>>
>>gcc/cp/ChangeLog:
>>
>>	* error.c: Define INCLUDE_MEMORY instead of
>>	INCLUDE_UNIQUE_PTR.
>>	* lex.c: Likewise.
>>	* name-lookup.c: Likewise.
>>	(class namespace_limit_reached): Use std::unique_ptr instead of
>>	gnu::unique_ptr.
>>	(suggest_alternatives_for): Use std::move instead of gnu::move.
>>	(suggest_alternatives_in_other_namespaces): Likewise.
>>	* parser.c: Define INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR.
>>
>>gcc/ChangeLog:
>>
>>	* Makefile.in: Remove unique-ptr-tests.o.
>>	* selftest-run-tests.c (selftest::run_tests): Remove
>>	unique_ptr_tests_cc_tests.
>>	* selftest.h (unique_ptr_tests_cc_tests): Remove.
>>	* system.h: Check INCLUDE_MEMORY instead of INCLUDE_UNIQUE_PTR
>>	and include <memory> instead of "unique-ptr.h".
>>	* unique-ptr-tests.cc: Removed.
>>
>>include/ChangeLog:
>>
>>	* unique-ptr.h: Removed.
>>---
>>gcc/Makefile.in               |   1 -
>>gcc/analyzer/engine.cc        |   2 +-
>>gcc/c-family/known-headers.cc |   2 +-
>>gcc/c-family/name-hint.h      |  12 +-
>>gcc/c/c-decl.c                |   2 +-
>>gcc/c/c-parser.c              |   2 +-
>>gcc/cp/error.c                |   2 +-
>>gcc/cp/lex.c                  |   2 +-
>>gcc/cp/name-lookup.c          |  10 +-
>>gcc/cp/parser.c               |   2 +-
>>gcc/selftest-run-tests.c      |   1 -
>>gcc/selftest.h                |   1 -
>>gcc/system.h                  |   8 +-
>>gcc/unique-ptr-tests.cc       | 236 --------------------
>>include/unique-ptr.h          | 405 ----------------------------------
>>15 files changed, 21 insertions(+), 667 deletions(-)
>>delete mode 100644 gcc/unique-ptr-tests.cc
>>delete mode 100644 include/unique-ptr.h
>>
>>diff --git a/gcc/Makefile.in b/gcc/Makefile.in
>>index 571e9c28e29..1e8e4449ffb 100644
>>--- a/gcc/Makefile.in
>>+++ b/gcc/Makefile.in
>>@@ -1693,7 +1693,6 @@ OBJS = \
>>	tree.o \
>>	tristate.o \
>>	typed-splay-tree.o \
>>-	unique-ptr-tests.o \
>>	valtrack.o \
>>	value-pointer-equiv.o \
>>	value-query.o \
>>diff --git a/gcc/analyzer/engine.cc b/gcc/analyzer/engine.cc
>>index f21f8e5b78a..1312741bb47 100644
>>--- a/gcc/analyzer/engine.cc
>>+++ b/gcc/analyzer/engine.cc
>>@@ -19,7 +19,7 @@ along with GCC; see the file COPYING3.  If not see
>><http://www.gnu.org/licenses/>.  */
>>
>>#include "config.h"
>>-#define INCLUDE_UNIQUE_PTR
>>+#define INCLUDE_MEMORY
>>#include "system.h"
>>#include "coretypes.h"
>>#include "tree.h"
>>diff --git a/gcc/c-family/known-headers.cc b/gcc/c-family/known-headers.cc
>>index a3912468a8d..572cca177fa 100644
>>--- a/gcc/c-family/known-headers.cc
>>+++ b/gcc/c-family/known-headers.cc
>>@@ -18,7 +18,7 @@ along with GCC; see the file COPYING3.  If not see
>><http://www.gnu.org/licenses/>.  */
>>
>>#include "config.h"
>>-#define INCLUDE_UNIQUE_PTR
>>+#define INCLUDE_MEMORY
>>#include "system.h"
>>#include "coretypes.h"
>>#include "c-family/c-common.h"
>>diff --git a/gcc/c-family/name-hint.h b/gcc/c-family/name-hint.h
>>index ea433243ba4..3141552ea59 100644
>>--- a/gcc/c-family/name-hint.h
>>+++ b/gcc/c-family/name-hint.h
>>@@ -20,12 +20,12 @@ along with GCC; see the file COPYING3.  If not see
>>#ifndef GCC_NAME_HINT_H
>>#define GCC_NAME_HINT_H
>>
>>-/* This header uses gnu::unique_ptr, but unique-ptr.h can't be directly
>>+/* This header uses std::unique_ptr, but <memory> can't be directly
>>   included due to issues with macros.  Hence it must be included from
>>-   system.h by defining INCLUDE_UNIQUE_PTR in any source file using it.  */
>>+   system.h by defining INCLUDE_MEMORY in any source file using it.  */
>>
>>-#ifndef GNU_UNIQUE_PTR_H
>>-# error "You must define INCLUDE_UNIQUE_PTR before including system.h to use name-hint.h"
>>+#ifndef INCLUDE_MEMORY
>>+# error "You must define INCLUDE_MEMORY before including system.h to use name-hint.h"
>>#endif
>>
>>enum lookup_name_fuzzy_kind {
>>@@ -106,7 +106,7 @@ public:
>>
>>  /* Take ownership of this name_hint's deferred_diagnostic, for use
>>     in chaining up deferred diagnostics.  */
>>-  gnu::unique_ptr<deferred_diagnostic> take_deferred () { return move (m_deferred); }
>>+  std::unique_ptr<deferred_diagnostic> take_deferred () { return move (m_deferred); }
>>
>>  /* Call this on a name_hint if the corresponding warning was not emitted,
>>     in which case we should also not emit the deferred_diagnostic.  */
>>@@ -119,7 +119,7 @@ public:
>>
>>private:
>>  const char *m_suggestion;
>>-  gnu::unique_ptr<deferred_diagnostic> m_deferred;
>>+  std::unique_ptr<deferred_diagnostic> m_deferred;
>>};
>>
>>extern name_hint lookup_name_fuzzy (tree, enum lookup_name_fuzzy_kind,
>>diff --git a/gcc/c/c-decl.c b/gcc/c/c-decl.c
>>index 186fa1692c1..603c1e05dd3 100644
>>--- a/gcc/c/c-decl.c
>>+++ b/gcc/c/c-decl.c
>>@@ -26,7 +26,7 @@ along with GCC; see the file COPYING3.  If not see
>>
>>#include "config.h"
>>#define INCLUDE_STRING
>>-#define INCLUDE_UNIQUE_PTR
>>+#define INCLUDE_MEMORY
>>#include "system.h"
>>#include "coretypes.h"
>>#include "target.h"
>>diff --git a/gcc/c/c-parser.c b/gcc/c/c-parser.c
>>index 80dd61d599e..ff5b89abfde 100644
>>--- a/gcc/c/c-parser.c
>>+++ b/gcc/c/c-parser.c
>>@@ -36,7 +36,7 @@ along with GCC; see the file COPYING3.  If not see
>>   location rather than implicitly using input_location.  */
>>
>>#include "config.h"
>>-#define INCLUDE_UNIQUE_PTR
>>+#define INCLUDE_MEMORY
>>#include "system.h"
>>#include "coretypes.h"
>>#include "target.h"
>>diff --git a/gcc/cp/error.c b/gcc/cp/error.c
>>index 012a4ecddf4..3e420aba3ba 100644
>>--- a/gcc/cp/error.c
>>+++ b/gcc/cp/error.c
>>@@ -19,7 +19,7 @@ along with GCC; see the file COPYING3.  If not see
>>
>>#include "config.h"
>>/* For use with name_hint.  */
>>-#define INCLUDE_UNIQUE_PTR
>>+#define INCLUDE_MEMORY
>>#include "system.h"
>>#include "coretypes.h"
>>#include "cp-tree.h"
>>diff --git a/gcc/cp/lex.c b/gcc/cp/lex.c
>>index 43abd019e6e..06de6cfe3b3 100644
>>--- a/gcc/cp/lex.c
>>+++ b/gcc/cp/lex.c
>>@@ -23,7 +23,7 @@ along with GCC; see the file COPYING3.  If not see
>>
>>#include "config.h"
>>/* For use with name_hint.  */
>>-#define INCLUDE_UNIQUE_PTR
>>+#define INCLUDE_MEMORY
>>#include "system.h"
>>#include "coretypes.h"
>>#include "cp-tree.h"
>>diff --git a/gcc/cp/name-lookup.c b/gcc/cp/name-lookup.c
>>index 035bcf51278..5be332569eb 100644
>>--- a/gcc/cp/name-lookup.c
>>+++ b/gcc/cp/name-lookup.c
>>@@ -19,7 +19,7 @@ along with GCC; see the file COPYING3.  If not see
>><http://www.gnu.org/licenses/>.  */
>>
>>#include "config.h"
>>-#define INCLUDE_UNIQUE_PTR
>>+#define INCLUDE_MEMORY
>>#include "system.h"
>>#include "coretypes.h"
>>#include "cp-tree.h"
>>@@ -6383,7 +6383,7 @@ class namespace_limit_reached : public deferred_diagnostic
>>{
>> public:
>>  namespace_limit_reached (location_t loc, unsigned limit, tree name,
>>-			   gnu::unique_ptr<deferred_diagnostic> wrapped)
>>+			   std::unique_ptr<deferred_diagnostic> wrapped)
>>  : deferred_diagnostic (loc),
>>    m_limit (limit), m_name (name),
>>    m_wrapped (move (wrapped))
>>@@ -6403,7 +6403,7 @@ class namespace_limit_reached : public deferred_diagnostic
>> private:
>>  unsigned m_limit;
>>  tree m_name;
>>-  gnu::unique_ptr<deferred_diagnostic> m_wrapped;
>>+  std::unique_ptr<deferred_diagnostic> m_wrapped;
>>};
>>
>>/* Subclass of deferred_diagnostic, for use when issuing a single suggestion.
>>@@ -6647,7 +6647,7 @@ suggest_alternatives_for (location_t location, tree name,
>>  if (!result)
>>    result = suggest_alternatives_for_1 (location, name, suggest_misspellings);
>>
>>-  return ns_hints.maybe_decorate_with_limit (gnu::move (result));
>>+  return ns_hints.maybe_decorate_with_limit (std::move (result));
>>}
>>
>>/* The second half of suggest_alternatives_for, for when no exact matches
>>@@ -6692,7 +6692,7 @@ suggest_alternatives_in_other_namespaces (location_t location, tree name)
>>
>>  name_hint result = ns_hints.convert_candidates_to_name_hint ();
>>
>>-  return ns_hints.maybe_decorate_with_limit (gnu::move (result));
>>+  return ns_hints.maybe_decorate_with_limit (std::move (result));
>>}
>>
>>/* A well-known name within the C++ standard library, returned by
>>diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
>>index 32de97b08bd..a678340d67d 100644
>>--- a/gcc/cp/parser.c
>>+++ b/gcc/cp/parser.c
>>@@ -19,7 +19,7 @@ along with GCC; see the file COPYING3.  If not see
>><http://www.gnu.org/licenses/>.  */
>>
>>#include "config.h"
>>-#define INCLUDE_UNIQUE_PTR
>>+#define INCLUDE_MEMORY
>>#include "system.h"
>>#include "coretypes.h"
>>#include "cp-tree.h"
>>diff --git a/gcc/selftest-run-tests.c b/gcc/selftest-run-tests.c
>>index 6a8f291f5dd..8eb1239b59c 100644
>>--- a/gcc/selftest-run-tests.c
>>+++ b/gcc/selftest-run-tests.c
>>@@ -71,7 +71,6 @@ selftest::run_tests ()
>>  sreal_c_tests ();
>>  fibonacci_heap_c_tests ();
>>  typed_splay_tree_c_tests ();
>>-  unique_ptr_tests_cc_tests ();
>>  opt_proposer_c_tests ();
>>  opts_c_tests ();
>>  json_cc_tests ();
>>diff --git a/gcc/selftest.h b/gcc/selftest.h
>>index 24ef57cb6cc..e6c7fc35afa 100644
>>--- a/gcc/selftest.h
>>+++ b/gcc/selftest.h
>>@@ -262,7 +262,6 @@ extern void tree_cfg_c_tests ();
>>extern void tree_diagnostic_path_cc_tests ();
>>extern void tristate_cc_tests ();
>>extern void typed_splay_tree_c_tests ();
>>-extern void unique_ptr_tests_cc_tests ();
>>extern void vec_c_tests ();
>>extern void vec_perm_indices_c_tests ();
>>extern void wide_int_cc_tests ();
>>diff --git a/gcc/system.h b/gcc/system.h
>>index 4ac656c9c3c..2cd201743c3 100644
>>--- a/gcc/system.h
>>+++ b/gcc/system.h
>>@@ -737,12 +737,10 @@ extern int vsnprintf (char *, size_t, const char *, va_list);
>>
>>/* Some of the headers included by <memory> can use "abort" within a
>>   namespace, e.g. "_VSTD::abort();", which fails after we use the
>>-   preprocessor to redefine "abort" as "fancy_abort" below.
>>-   Given that unique-ptr.h can use "free", we need to do this after "free"
>>-   is declared but before "abort" is overridden.  */
>>+   preprocessor to redefine "abort" as "fancy_abort" below.  */
>>
>>-#ifdef INCLUDE_UNIQUE_PTR
>>-# include "unique-ptr.h"
>>+#ifdef INCLUDE_MEMORY
>>+# include <memory>
>>#endif
>>
>>#ifdef INCLUDE_MALLOC_H
>>diff --git a/gcc/unique-ptr-tests.cc b/gcc/unique-ptr-tests.cc
>>deleted file mode 100644
>>index 975dd57398e..00000000000
>>--- a/gcc/unique-ptr-tests.cc
>>+++ /dev/null
>>@@ -1,236 +0,0 @@
>>-/* Unit tests for unique-ptr.h.
>>-   Copyright (C) 2017-2021 Free Software Foundation, Inc.
>>-
>>-This file is part of GCC.
>>-
>>-GCC is free software; you can redistribute it and/or modify it under
>>-the terms of the GNU General Public License as published by the Free
>>-Software Foundation; either version 3, or (at your option) any later
>>-version.
>>-
>>-GCC is distributed in the hope that it will be useful, but WITHOUT ANY
>>-WARRANTY; without even the implied warranty of MERCHANTABILITY or
>>-FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
>>-for more details.
>>-
>>-You should have received a copy of the GNU General Public License
>>-along with GCC; see the file COPYING3.  If not see
>>-<http://www.gnu.org/licenses/>.  */
>>-
>>-#include "config.h"
>>-#define INCLUDE_UNIQUE_PTR
>>-#include "system.h"
>>-#include "coretypes.h"
>>-#include "selftest.h"
>>-
>>-#if CHECKING_P
>>-
>>-namespace selftest {
>>-
>>-namespace {
>>-
>>-/* A class for counting ctor and dtor invocations.  */
>>-
>>-class stats
>>-{
>>-public:
>>-  stats () : ctor_count (0), dtor_count (0) {}
>>-
>>-  int ctor_count;
>>-  int dtor_count;
>>-};
>>-
>>-/* A class that uses "stats" to track its ctor and dtor invocations.  */
>>-
>>-class foo
>>-{
>>-public:
>>-  foo (stats &s) : m_s (s) { ++m_s.ctor_count; }
>>-  ~foo () { ++m_s.dtor_count; }
>>-
>>-  int example_method () const { return 42; }
>>-
>>-private:
>>-  foo (const foo&);
>>-  foo & operator= (const foo &);
>>-
>>-private:
>>-  stats &m_s;
>>-};
>>-
>>-/* A struct for testing unique_ptr<T[]>.  */
>>-
>>-class has_default_ctor
>>-{
>>-public:
>>-  has_default_ctor () : m_field (42) {}
>>-  int m_field;
>>-};
>>-
>>-/* A dummy struct for testing unique_xmalloc_ptr.  */
>>-
>>-struct dummy
>>-{
>>-  int field;
>>-};
>>-
>>-} // anonymous namespace
>>-
>>-/* Verify that the default ctor inits ptrs to NULL.  */
>>-
>>-static void
>>-test_null_ptr ()
>>-{
>>-  gnu::unique_ptr<void *> p;
>>-  ASSERT_EQ (NULL, p);
>>-
>>-  gnu::unique_xmalloc_ptr<void *> q;
>>-  ASSERT_EQ (NULL, q);
>>-}
>>-
>>-/* Verify that deletion happens when a unique_ptr goes out of scope.  */
>>-
>>-static void
>>-test_implicit_deletion ()
>>-{
>>-  stats s;
>>-  ASSERT_EQ (0, s.ctor_count);
>>-  ASSERT_EQ (0, s.dtor_count);
>>-
>>-  {
>>-    gnu::unique_ptr<foo> f (new foo (s));
>>-    ASSERT_NE (NULL, f);
>>-    ASSERT_EQ (1, s.ctor_count);
>>-    ASSERT_EQ (0, s.dtor_count);
>>-  }
>>-
>>-  /* Verify that the foo was implicitly deleted.  */
>>-  ASSERT_EQ (1, s.ctor_count);
>>-  ASSERT_EQ (1, s.dtor_count);
>>-}
>>-
>>-/* Verify that we can assign to a NULL unique_ptr.  */
>>-
>>-static void
>>-test_overwrite_of_null ()
>>-{
>>-  stats s;
>>-  ASSERT_EQ (0, s.ctor_count);
>>-  ASSERT_EQ (0, s.dtor_count);
>>-
>>-  {
>>-    gnu::unique_ptr<foo> f;
>>-    ASSERT_EQ (NULL, f);
>>-    ASSERT_EQ (0, s.ctor_count);
>>-    ASSERT_EQ (0, s.dtor_count);
>>-
>>-    /* Overwrite with a non-NULL value.  */
>>-    f = gnu::unique_ptr<foo> (new foo (s));
>>-    ASSERT_EQ (1, s.ctor_count);
>>-    ASSERT_EQ (0, s.dtor_count);
>>-  }
>>-
>>-  /* Verify that the foo is implicitly deleted.  */
>>-  ASSERT_EQ (1, s.ctor_count);
>>-  ASSERT_EQ (1, s.dtor_count);
>>-}
>>-
>>-/* Verify that we can assign to a non-NULL unique_ptr.  */
>>-
>>-static void
>>-test_overwrite_of_non_null ()
>>-{
>>-  stats s;
>>-  ASSERT_EQ (0, s.ctor_count);
>>-  ASSERT_EQ (0, s.dtor_count);
>>-
>>-  {
>>-    gnu::unique_ptr<foo> f (new foo (s));
>>-    ASSERT_NE (NULL, f);
>>-    ASSERT_EQ (1, s.ctor_count);
>>-    ASSERT_EQ (0, s.dtor_count);
>>-
>>-    /* Overwrite with a different value.  */
>>-    f = gnu::unique_ptr<foo> (new foo (s));
>>-    ASSERT_EQ (2, s.ctor_count);
>>-    ASSERT_EQ (1, s.dtor_count);
>>-  }
>>-
>>-  /* Verify that the 2nd foo was implicitly deleted.  */
>>-  ASSERT_EQ (2, s.ctor_count);
>>-  ASSERT_EQ (2, s.dtor_count);
>>-}
>>-
>>-/* Verify that unique_ptr's overloaded ops work.  */
>>-
>>-static void
>>-test_overloaded_ops ()
>>-{
>>-  stats s;
>>-  gnu::unique_ptr<foo> f (new foo (s));
>>-  ASSERT_EQ (42, f->example_method ());
>>-  ASSERT_EQ (42, (*f).example_method ());
>>-  ASSERT_EQ (f, f);
>>-  ASSERT_NE (NULL, f.get ());
>>-
>>-  gnu::unique_ptr<foo> g (new foo (s));
>>-  ASSERT_NE (f, g);
>>-}
>>-
>>-/* Verify that the gnu::unique_ptr specialization for T[] works.  */
>>-
>>-static void
>>-test_array_new ()
>>-{
>>-  const int num = 10;
>>-  gnu::unique_ptr<has_default_ctor[]> p (new has_default_ctor[num]);
>>-  ASSERT_NE (NULL, p.get ());
>>-  /* Verify that operator[] works, and that the default ctor was called
>>-     on each element.  */
>>-  for (int i = 0; i < num; i++)
>>-    ASSERT_EQ (42, p[i].m_field);
>>-}
>>-
>>-/* Verify that gnu::unique_xmalloc_ptr works.  */
>>-
>>-static void
>>-test_xmalloc ()
>>-{
>>-  gnu::unique_xmalloc_ptr<dummy> p (XNEW (dummy));
>>-  ASSERT_NE (NULL, p.get ());
>>-}
>>-
>>-/* Verify the gnu::unique_xmalloc_ptr specialization for T[].  */
>>-
>>-static void
>>-test_xmalloc_array ()
>>-{
>>-  const int num = 10;
>>-  gnu::unique_xmalloc_ptr<dummy[]> p (XNEWVEC (dummy, num));
>>-  ASSERT_NE (NULL, p.get ());
>>-
>>-  /* Verify that operator[] works.  */
>>-  for (int i = 0; i < num; i++)
>>-    p[i].field = 42;
>>-  for (int i = 0; i < num; i++)
>>-    ASSERT_EQ (42, p[i].field);
>>-}
>>-
>>-/* Run all of the selftests within this file.  */
>>-
>>-void
>>-unique_ptr_tests_cc_tests ()
>>-{
>>-  test_null_ptr ();
>>-  test_implicit_deletion ();
>>-  test_overwrite_of_null ();
>>-  test_overwrite_of_non_null ();
>>-  test_overloaded_ops ();
>>-  test_array_new ();
>>-  test_xmalloc ();
>>-  test_xmalloc_array ();
>>-}
>>-
>>-} // namespace selftest
>>-
>>-#endif /* #if CHECKING_P */
>>diff --git a/include/unique-ptr.h b/include/unique-ptr.h
>>deleted file mode 100644
>>index d1b2ba5b62d..00000000000
>>--- a/include/unique-ptr.h
>>+++ /dev/null
>>@@ -1,405 +0,0 @@
>>-/* gnu::unique_ptr, a simple std::unique_ptr replacement for C++03.
>>-
>>-   Copyright (C) 2007-2021 Free Software Foundation, Inc.
>>-
>>-   This file is part of GCC.
>>-
>>-   This program is free software; you can redistribute it and/or modify
>>-   it under the terms of the GNU General Public License as published by
>>-   the Free Software Foundation; either version 3 of the License, or
>>-   (at your option) any later version.
>>-
>>-   This program is distributed in the hope that it will be useful,
>>-   but WITHOUT ANY WARRANTY; without even the implied warranty of
>>-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>-   GNU General Public License for more details.
>>-
>>-   You should have received a copy of the GNU General Public License
>>-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
>>-
>>-/* gnu::unique_ptr defines a C++ owning smart pointer that exposes a
>>-   subset of the std::unique_ptr API.
>>-
>>-   In fact, when compiled with a C++11 compiler, gnu::unique_ptr
>>-   actually _is_ std::unique_ptr.  When compiled with a C++03 compiler
>>-   OTOH, it's an hand coded std::unique_ptr emulation that assumes
>>-   code is correct and doesn't try to be too smart.
>>-
>>-   This supports custom deleters, but not _stateful_ deleters, so you
>>-   can't use those in C++11 mode either.  Only the managed pointer is
>>-   stored in the smart pointer.  That could be changed; it simply
>>-   wasn't found necessary.
>>-
>>-   At the end of the file you'll find a gnu::unique_ptr partial
>>-   specialization that uses a custom (stateless) deleter:
>>-   gnu::unique_xmalloc_ptr.  That is used to manage pointers to
>>-   objects allocated with xmalloc.
>>-
>>-   The C++03 version was originally based on GCC 7.0's std::auto_ptr
>>-   and then heavily customized to behave more like C++11's
>>-   std::unique_ptr, but at this point, it no longer shares much at all
>>-   with the original file.  But, that's the history and the reason for
>>-   the copyright's starting year.
>>-
>>-   The C++03 version lets you shoot yourself in the foot, since
>>-   similarly to std::auto_ptr, the copy constructor and assignment
>>-   operators actually move.  Also, in the name of simplicity, no
>>-   effort is spent on using SFINAE to prevent invalid conversions,
>>-   etc.  This is not really a problem, because the goal here is to
>>-   allow code that would be correct using std::unique_ptr to be
>>-   equally correct in C++03 mode, and, just as efficient.  If client
>>-   code compiles correctly with a C++11 (or newer) compiler, we know
>>-   we're not doing anything invalid by mistake.
>>-
>>-   Usage notes:
>>-
>>-   - Putting gnu::unique_ptr in standard containers is not supported,
>>-     since C++03 containers are not move-aware (and our emulation
>>-     relies on copy actually moving).
>>-
>>-   - Since there's no nullptr in C++03, gnu::unique_ptr allows
>>-     implicit initialization and assignment from NULL instead.
>>-
>>-   - To check whether there's an associated managed object, all these
>>-     work as expected:
>>-
>>-      if (ptr)
>>-      if (!ptr)
>>-      if (ptr != NULL)
>>-      if (ptr == NULL)
>>-      if (NULL != ptr)
>>-      if (NULL == ptr)
>>-*/
>>-
>>-#ifndef GNU_UNIQUE_PTR_H
>>-#define GNU_UNIQUE_PTR_H 1
>>-
>>-#if __cplusplus >= 201103
>>-# include <memory>
>>-#endif
>>-
>>-namespace gnu
>>-{
>>-
>>-#if __cplusplus >= 201103
>>-
>>-/* In C++11 mode, all we need is import the standard
>>-   std::unique_ptr.  */
>>-template<typename T> using unique_ptr = std::unique_ptr<T>;
>>-
>>-/* Pull in move as well.  */
>>-using std::move;
>>-
>>-#else /* C++11 */
>>-
>>-/* Default destruction policy used by gnu::unique_ptr when no deleter
>>-   is specified.  Uses delete.  */
>>-
>>-template<typename T>
>>-struct default_delete
>>-{
>>-  void operator () (T *ptr) const { delete ptr; }
>>-};
>>-
>>-/* Specialization for arrays.  Uses delete[].  */
>>-
>>-template<typename T>
>>-struct default_delete<T[]>
>>-{
>>-  void operator () (T *ptr) const { delete [] ptr; }
>>-};
>>-
>>-namespace detail
>>-{
>>-/* Type used to support implicit construction from NULL:
>>-
>>-     gnu::unique_ptr<foo> func (....)
>>-     {
>>-     return NULL;
>>-     }
>>-
>>-   and assignment from NULL:
>>-
>>-     gnu::unique_ptr<foo> ptr (....);
>>-     ...
>>-     ptr = NULL;
>>-
>>-  It is intentionally not defined anywhere.  */
>>-struct nullptr_t;
>>-
>>-/* Base class of our unique_ptr emulation.  Contains code common to
>>-   both unique_ptr<T, D> and unique_ptr<T[], D>.  */
>>-
>>-template<typename T, typename D>
>>-class unique_ptr_base
>>-{
>>-public:
>>-  typedef T *pointer;
>>-  typedef T element_type;
>>-  typedef D deleter_type;
>>-
>>-  /* Takes ownership of a pointer.  P is a pointer to an object of
>>-     element_type type.  Defaults to NULL.  */
>>-  explicit unique_ptr_base (element_type *p = NULL) throw () : m_ptr (p) {}
>>-
>>-  /* The "move" constructor.  Really a copy constructor that actually
>>-     moves.  Even though std::unique_ptr is not copyable, our little
>>-     simpler emulation allows it, because:
>>-
>>-       - There are no rvalue references in C++03.  Our move emulation
>>-       instead relies on copy/assignment moving, like std::auto_ptr.
>>-       - RVO/NRVO requires an accessible copy constructor
>>-  */
>>-  unique_ptr_base (const unique_ptr_base &other) throw ()
>>-    : m_ptr (const_cast<unique_ptr_base &> (other).release ()) {}
>>-
>>-  /* Converting "move" constructor.  Really an lvalue ref converting
>>-     constructor that actually moves.  This allows constructs such as:
>>-
>>-      unique_ptr<Derived> func_returning_unique_ptr (.....);
>>-      ...
>>-      unique_ptr<Base> ptr = func_returning_unique_ptr (.....);
>>-  */
>>-  template<typename T1, typename D1>
>>-  unique_ptr_base (const unique_ptr_base<T1, D1> &other) throw ()
>>-    : m_ptr (const_cast<unique_ptr_base<T1, D1> &> (other).release ()) {}
>>-
>>-  /* The "move" assignment operator.  Really an lvalue ref copy
>>-     assignment operator that actually moves.  See comments above.  */
>>-  unique_ptr_base &operator= (const unique_ptr_base &other) throw ()
>>-  {
>>-    reset (const_cast<unique_ptr_base &> (other).release ());
>>-    return *this;
>>-  }
>>-
>>-  /* Converting "move" assignment.  Really an lvalue ref converting
>>-     copy assignment operator that moves.  See comments above.  */
>>-  template<typename T1, typename D1>
>>-  unique_ptr_base &operator= (const unique_ptr_base<T1, D1> &other) throw ()
>>-  {
>>-    reset (const_cast<unique_ptr_base<T1, D1> &> (other).release ());
>>-    return *this;
>>-  }
>>-
>>-  /* std::unique_ptr does not allow assignment, except from nullptr.
>>-     nullptr doesn't exist in C++03, so we allow assignment from NULL
>>-     instead [ptr = NULL;].
>>-  */
>>-  unique_ptr_base &operator= (detail::nullptr_t *) throw ()
>>-  {
>>-    reset ();
>>-    return *this;
>>-  }
>>-
>>-  ~unique_ptr_base () { call_deleter (); }
>>-
>>-  /* "explicit operator bool ()" emulation using the safe bool
>>-     idiom.  */
>>-private:
>>-  typedef void (unique_ptr_base::*explicit_operator_bool) () const;
>>-  void this_type_does_not_support_comparisons () const {}
>>-
>>-public:
>>-  operator explicit_operator_bool () const
>>-  {
>>-    return (m_ptr != NULL
>>-	    ? &unique_ptr_base::this_type_does_not_support_comparisons
>>-	    : 0);
>>-  }
>>-
>>-  element_type *get () const throw () { return m_ptr; }
>>-
>>-  element_type *release () throw ()
>>-  {
>>-    pointer tmp = m_ptr;
>>-    m_ptr = NULL;
>>-    return tmp;
>>-  }
>>-
>>-  void reset (element_type *p = NULL) throw ()
>>-  {
>>-    if (p != m_ptr)
>>-      {
>>-	call_deleter ();
>>-	m_ptr = p;
>>-      }
>>-  }
>>-
>>-private:
>>-
>>-  /* Call the deleter.  Note we assume the deleter is "stateless".  */
>>-  void call_deleter ()
>>-  {
>>-    D d;
>>-
>>-    d (m_ptr);
>>-  }
>>-
>>-  element_type *m_ptr;
>>-};
>>-
>>-} /* namespace detail */
>>-
>>-/* Macro used to create a unique_ptr_base "partial specialization" --
>>-   a subclass that uses a specific deleter.  Basically this re-defines
>>-   the necessary constructors.  This is necessary because C++03
>>-   doesn't support inheriting constructors with "using".  While at it,
>>-   we inherit the assignment operator.  TYPE is the name of the type
>>-   being defined.  Assumes that 'base_type' is a typedef of the
>>-   baseclass TYPE is inheriting from.  */
>>-#define DEFINE_GNU_UNIQUE_PTR(TYPE)						\
>>-public:									\
>>-  explicit TYPE (T *p = NULL) throw ()					\
>>-    : base_type (p) {}							\
>>-									\
>>-  TYPE (const TYPE &other) throw () : base_type (other) {}		\
>>-									\
>>-  TYPE (detail::nullptr_t *) throw () : base_type (NULL) {}		\
>>-									\
>>-  template<typename T1, typename D1>					\
>>-  TYPE (const detail::unique_ptr_base<T1, D1> &other) throw ()		\
>>-    : base_type (other) {}						\
>>-									\
>>-  using base_type::operator=;
>>-
>>-/* Define single-object gnu::unique_ptr.  */
>>-
>>-template <typename T, typename D = default_delete<T> >
>>-class unique_ptr : public detail::unique_ptr_base<T, D>
>>-{
>>-  typedef detail::unique_ptr_base<T, D> base_type;
>>-
>>-  DEFINE_GNU_UNIQUE_PTR (unique_ptr)
>>-
>>-public:
>>-  /* Dereferencing.  */
>>-  T &operator* () const throw () { return *this->get (); }
>>-  T *operator-> () const throw () { return this->get (); }
>>-};
>>-
>>-/* Define gnu::unique_ptr specialization for T[].  */
>>-
>>-template <typename T, typename D>
>>-class unique_ptr<T[], D> : public detail::unique_ptr_base<T, D>
>>-{
>>-  typedef detail::unique_ptr_base<T, D> base_type;
>>-
>>-  DEFINE_GNU_UNIQUE_PTR (unique_ptr)
>>-
>>-public:
>>-  /* Indexing operator.  */
>>-  T &operator[] (size_t i) const { return this->get ()[i]; }
>>-};
>>-
>>-/* Comparison operators.  */
>>-
>>-template <typename T, typename D,
>>-	  typename U, typename E>
>>-inline bool
>>-operator== (const detail::unique_ptr_base<T, D> &x,
>>-	    const detail::unique_ptr_base<U, E> &y)
>>-{ return x.get() == y.get(); }
>>-
>>-template <typename T, typename D,
>>-	  typename U, typename E>
>>-inline bool
>>-operator!= (const detail::unique_ptr_base<T, D> &x,
>>-	    const detail::unique_ptr_base<U, E> &y)
>>-{ return x.get() != y.get(); }
>>-
>>-template<typename T, typename D,
>>-	 typename U, typename E>
>>-inline bool
>>-operator< (const detail::unique_ptr_base<T, D> &x,
>>-	   const detail::unique_ptr_base<U, E> &y)
>>-{ return x.get() < y.get (); }
>>-
>>-template<typename T, typename D,
>>-	 typename U, typename E>
>>-inline bool
>>-operator<= (const detail::unique_ptr_base<T, D> &x,
>>-	    const detail::unique_ptr_base<U, E> &y)
>>-{ return !(y < x); }
>>-
>>-template<typename T, typename D,
>>-	 typename U, typename E>
>>-inline bool
>>-operator> (const detail::unique_ptr_base<T, D> &x,
>>-	   const detail::unique_ptr_base<U, E> &y)
>>-{ return y < x; }
>>-
>>-template<typename T, typename D,
>>-	 typename U, typename E>
>>-inline bool
>>-operator>= (const detail::unique_ptr_base<T, D> &x,
>>-	    const detail::unique_ptr_base<U, E> &y)
>>-{ return !(x < y); }
>>-
>>-/* std::move "emulation".  This is as simple as it can be -- no
>>-   attempt is made to emulate rvalue references.  This relies on T
>>-   having move semantics like std::auto_ptr.
>>-   I.e., copy/assignment actually moves.  */
>>-
>>-template<typename T>
>>-const T&
>>-move (T& v)
>>-{
>>-  return v;
>>-}
>>-
>>-#endif /* C++11 */
>>-
>>-/* Define gnu::unique_xmalloc_ptr, a gnu::unique_ptr that manages
>>-   xmalloc'ed memory.  */
>>-
>>-/* The deleter for gnu::unique_xmalloc_ptr.  Uses free.  */
>>-template <typename T>
>>-struct xmalloc_deleter
>>-{
>>-  void operator() (T *ptr) const { free (ptr); }
>>-};
>>-
>>-/* Same, for arrays.  */
>>-template <typename T>
>>-struct xmalloc_deleter<T[]>
>>-{
>>-  void operator() (T *ptr) const { free (ptr); }
>>-};
>>-
>>-#if __cplusplus >= 201103
>>-
>>-/* In C++11, we just import the standard unique_ptr to our namespace
>>-   with a custom deleter.  */
>>-
>>-template<typename T> using unique_xmalloc_ptr
>>-  = std::unique_ptr<T, xmalloc_deleter<T>>;
>>-
>>-#else /* C++11 */
>>-
>>-/* In C++03, we don't have template aliases, so we need to define a
>>-   subclass instead, and re-define the constructors, because C++03
>>-   doesn't support inheriting constructors either.  */
>>-
>>-template <typename T>
>>-class unique_xmalloc_ptr : public unique_ptr<T, xmalloc_deleter<T> >
>>-{
>>-  typedef unique_ptr<T, xmalloc_deleter<T> > base_type;
>>-
>>-  DEFINE_GNU_UNIQUE_PTR (unique_xmalloc_ptr)
>>-};
>>-
>>-/* Define gnu::unique_xmalloc_ptr specialization for T[].  */
>>-
>>-template <typename T>
>>-class unique_xmalloc_ptr<T[]> : public unique_ptr<T[], xmalloc_deleter<T[]> >
>>-{
>>-  typedef unique_ptr<T[], xmalloc_deleter<T[]> > base_type;
>>-
>>-  DEFINE_GNU_UNIQUE_PTR (unique_xmalloc_ptr)
>>-};
>>-
>>-#endif /* C++11 */
>>-
>>-} /* namespace gnu */
>>-
>>-#endif /* GNU_UNIQUE_PTR_H */