[v12,25/26] c++: Implement __is_nothrow_invocable built-in trait

Message ID 20240221085142.3779280-25-kmatsui@gcc.gnu.org
State Superseded
Headers
Series None |

Commit Message

Ken Matsui Feb. 21, 2024, 8:51 a.m. UTC
  This patch implements built-in trait for std::is_nothrow_invocable.

gcc/cp/ChangeLog:

	* cp-trait.def: Define __is_nothrow_invocable.
	* constraint.cc (diagnose_trait_expr): Handle
	CPTK_IS_NOTHROW_INVOCABLE.
	* semantics.cc (trait_expr_value): Likewise.
	(finish_trait_expr): Likewise.

gcc/testsuite/ChangeLog:

	* g++.dg/ext/is_nothrow_invocable.C: New test.

Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
 gcc/cp/constraint.cc                          |  6 ++
 gcc/cp/cp-trait.def                           |  1 +
 gcc/cp/semantics.cc                           |  4 ++
 .../g++.dg/ext/is_nothrow_invocable.C         | 66 +++++++++++++++++++
 4 files changed, 77 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/ext/is_nothrow_invocable.C
  

Patch

diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc
index c87b126fdb1..43d4f2102d6 100644
--- a/gcc/cp/constraint.cc
+++ b/gcc/cp/constraint.cc
@@ -3824,6 +3824,12 @@  diagnose_trait_expr (tree expr, tree args)
     case CPTK_IS_NOTHROW_CONVERTIBLE:
 	  inform (loc, "  %qT is not nothrow convertible from %qE", t2, t1);
       break;
+    case CPTK_IS_NOTHROW_INVOCABLE:
+	if (!t2)
+	  inform (loc, "  %qT is not nothrow invocable", t1);
+	else
+	  inform (loc, "  %qT is not nothrow invocable by %qE", t1, t2);
+	break;
     case CPTK_IS_OBJECT:
       inform (loc, "  %qT is not an object type", t1);
       break;
diff --git a/gcc/cp/cp-trait.def b/gcc/cp/cp-trait.def
index 6cb2b55f4ea..a9714921e94 100644
--- a/gcc/cp/cp-trait.def
+++ b/gcc/cp/cp-trait.def
@@ -84,6 +84,7 @@  DEFTRAIT_EXPR (IS_MEMBER_POINTER, "__is_member_pointer", 1)
 DEFTRAIT_EXPR (IS_NOTHROW_ASSIGNABLE, "__is_nothrow_assignable", 2)
 DEFTRAIT_EXPR (IS_NOTHROW_CONSTRUCTIBLE, "__is_nothrow_constructible", -1)
 DEFTRAIT_EXPR (IS_NOTHROW_CONVERTIBLE, "__is_nothrow_convertible", 2)
+DEFTRAIT_EXPR (IS_NOTHROW_INVOCABLE, "__is_nothrow_invocable", -1)
 DEFTRAIT_EXPR (IS_OBJECT, "__is_object", 1)
 DEFTRAIT_EXPR (IS_POINTER_INTERCONVERTIBLE_BASE_OF, "__is_pointer_interconvertible_base_of", 2)
 DEFTRAIT_EXPR (IS_POD, "__is_pod", 1)
diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc
index 149c0631d62..dba7b43a109 100644
--- a/gcc/cp/semantics.cc
+++ b/gcc/cp/semantics.cc
@@ -12494,6 +12494,9 @@  trait_expr_value (cp_trait_kind kind, tree type1, tree type2)
     case CPTK_IS_NOTHROW_CONVERTIBLE:
       return is_nothrow_convertible (type1, type2);
 
+    case CPTK_IS_NOTHROW_INVOCABLE:
+      return expr_noexcept_p (build_invoke (type1, type2, tf_none), tf_none);
+
     case CPTK_IS_OBJECT:
       return (type_code1 != FUNCTION_TYPE
 	      && type_code1 != REFERENCE_TYPE
@@ -12689,6 +12692,7 @@  finish_trait_expr (location_t loc, cp_trait_kind kind, tree type1, tree type2)
     case CPTK_IS_NOTHROW_ASSIGNABLE:
     case CPTK_IS_NOTHROW_CONSTRUCTIBLE:
     case CPTK_IS_NOTHROW_CONVERTIBLE:
+    case CPTK_IS_NOTHROW_INVOCABLE:
     case CPTK_IS_TRIVIALLY_ASSIGNABLE:
     case CPTK_IS_TRIVIALLY_CONSTRUCTIBLE:
     case CPTK_REF_CONSTRUCTS_FROM_TEMPORARY:
diff --git a/gcc/testsuite/g++.dg/ext/is_nothrow_invocable.C b/gcc/testsuite/g++.dg/ext/is_nothrow_invocable.C
new file mode 100644
index 00000000000..b95307bb3a3
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/is_nothrow_invocable.C
@@ -0,0 +1,66 @@ 
+// { dg-do compile { target c++11 } }
+
+#define SA(X) static_assert((X),#X)
+
+struct T { T(int) { } };
+struct NT { NT(int) noexcept { } };
+struct Ex { explicit Ex(int) noexcept { } };
+
+using func_type = void(*)();
+SA( ! __is_nothrow_invocable(func_type) );
+
+#if __cpp_noexcept_function_type
+using func_type_nt = void(*)() noexcept;
+SA(   __is_nothrow_invocable(func_type_nt) );
+#endif
+
+struct X { };
+using mem_type = int X::*;
+
+SA( ! __is_nothrow_invocable(mem_type) );
+SA( ! __is_nothrow_invocable(mem_type, int) );
+SA( ! __is_nothrow_invocable(mem_type, int&) );
+SA(   __is_nothrow_invocable(mem_type, X&) );
+
+using memfun_type = int (X::*)();
+
+SA( ! __is_nothrow_invocable(memfun_type) );
+SA( ! __is_nothrow_invocable(memfun_type, int) );
+SA( ! __is_nothrow_invocable(memfun_type, int&) );
+SA( ! __is_nothrow_invocable(memfun_type, X&) );
+SA( ! __is_nothrow_invocable(memfun_type, X*) );
+
+#if __cpp_noexcept_function_type
+using memfun_type_nt = int (X::*)() noexcept;
+
+SA( ! __is_nothrow_invocable(memfun_type_nt) );
+SA( ! __is_nothrow_invocable(memfun_type_nt, int) );
+SA( ! __is_nothrow_invocable(memfun_type_nt, int&) );
+SA(   __is_nothrow_invocable(memfun_type_nt, X&) );
+SA(   __is_nothrow_invocable(memfun_type_nt, X*) );
+#endif
+
+struct F {
+  int& operator()();
+  long& operator()() const noexcept;
+  short& operator()(int) &&;
+  char& operator()(int) const& noexcept;
+private:
+  void operator()(int, int) noexcept;
+};
+using CF = const F;
+
+SA( ! __is_nothrow_invocable(F ) );
+SA(   __is_nothrow_invocable(CF) );
+
+SA( ! __is_nothrow_invocable(F,   int) );
+SA(   __is_nothrow_invocable(F&,  int) );
+
+SA(   __is_nothrow_invocable(CF,   int) );
+SA(   __is_nothrow_invocable(CF&,  int) );
+SA( ! __is_nothrow_invocable(F, int, int) );
+
+struct FX {
+  X operator()() const noexcept { return {}; }
+};
+SA(   __is_nothrow_invocable(FX) );