PR78361 recognise noexcept functions as referenceable

2017-01-13  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/78361
	* testsuite/20_util/add_pointer/value.cc: Test forming function
	pointers.

2017-01-13  Michael Brune  <lucdanton@free.fr>

	PR libstdc++/78361
	* include/std/type_traits (__is_referenceable): Handle noexcept
	function types.

From-SVN: r244432

libstdc++-v3/ChangeLog

+2017-01-13  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/78361
+	* testsuite/20_util/add_pointer/value.cc: Test forming function
+	pointers.
+
+2017-01-13  Michael Brune  <lucdanton@free.fr>
+
+	PR libstdc++/78361
+	* include/std/type_traits (__is_referenceable): Handle noexcept
+	function types.
+
 2017-01-12  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/77528

libstdc++-v3/include/std/type_traits

@@ -641,13 +641,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     : public __or_<is_object<_Tp>, is_reference<_Tp>>::type
     { };
 
-  template<typename _Res, typename... _Args>
-    struct __is_referenceable<_Res(_Args...)>
+  template<typename _Res, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
+    struct __is_referenceable<_Res(_Args...) _GLIBCXX_NOEXCEPT_QUAL>
     : public true_type
     { };
 
-  template<typename _Res, typename... _Args>
-    struct __is_referenceable<_Res(_Args......)>
+  template<typename _Res, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
+    struct __is_referenceable<_Res(_Args......) _GLIBCXX_NOEXCEPT_QUAL>
     : public true_type
     { };
 

libstdc++-v3/testsuite/20_util/add_pointer/value.cc

@@ -34,3 +34,18 @@ void test01()
 		ClassType**>::value, "");
   static_assert(is_same<add_pointer<ClassType>::type, ClassType*>::value, "");
 }
+
+void test02()
+{
+  using std::add_pointer;
+  using std::is_same;
+
+  void f1();
+  using f1_type = decltype(f1);
+  using pf1_type = decltype(&f1);
+  static_assert(is_same<add_pointer<f1_type>::type, pf1_type>::value, "");
+  void f2() noexcept; // PR libstdc++/78361
+  using f2_type = decltype(f2);
+  using pf2_type = decltype(&f2);
+  static_assert(is_same<add_pointer<f2_type>::type, pf2_type>::value, "");
+}