tuple (make_tuple, [...]): Declare constexpr.

2011-09-15  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/tuple (make_tuple, forward_as_tuple): Declare constexpr.
	(_Tuple_impl<>::_Tuple_impl(_Tuple_impl<>&&)): Likewise.
	* testsuite/20_util/tuple/creation_functions/constexpr.cc: Enable
	make_tuple test.
	* testsuite/20_util/weak_ptr/comparison/cmp_neg.cc: Adjust dg-warning
	line number.

From-SVN: r178904

libstdc++-v3/ChangeLog

+2011-09-15  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	* include/std/tuple (make_tuple, forward_as_tuple): Declare constexpr.
+	(_Tuple_impl<>::_Tuple_impl(_Tuple_impl<>&&)): Likewise.
+	* testsuite/20_util/tuple/creation_functions/constexpr.cc: Enable
+	make_tuple test.
+	* testsuite/20_util/weak_ptr/comparison/cmp_neg.cc: Adjust dg-warning
+	line number.
+
 2011-09-14  François Dumont  <fdumont@gcc.gnu.org>
 	    Paolo Carlini  <paolo.carlini@oracle.com>
 

libstdc++-v3/include/std/tuple

@@ -273,6 +273,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
       constexpr _Tuple_impl(const _Tuple_impl&) = default;
 
+      constexpr
       _Tuple_impl(_Tuple_impl&& __in)
       noexcept(__and_<is_nothrow_move_constructible<_Head>,
 	              is_nothrow_move_constructible<_Inherited>>::value)
@@ -285,7 +286,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	  _Base(_Tuple_impl<_Idx, _UElements...>::_M_head(__in)) { }
 
       template<typename _UHead, typename... _UTails>
-        _Tuple_impl(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
+        constexpr _Tuple_impl(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
 	: _Inherited(std::move
 		     (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))),
 	  _Base(std::forward<_UHead>
@@ -872,7 +873,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   // NB: DR 705.
   template<typename... _Elements>
-    inline tuple<typename __decay_and_strip<_Elements>::__type...>
+    constexpr tuple<typename __decay_and_strip<_Elements>::__type...>
     make_tuple(_Elements&&... __args)
     {
       typedef tuple<typename __decay_and_strip<_Elements>::__type...>
@@ -881,7 +882,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     }
 
   template<typename... _Elements>
-    inline tuple<_Elements&&...>
+    constexpr tuple<_Elements&&...>
     forward_as_tuple(_Elements&&... __args) noexcept
     { return tuple<_Elements&&...>(std::forward<_Elements>(__args)...); }
 

libstdc++-v3/testsuite/20_util/tuple/creation_functions/constexpr.cc

@@ -29,7 +29,6 @@ bool test __attribute__((unused)) = true;
 
 
 // make_tuple
-#if 0
 void
 test_make_tuple()
 {
@@ -43,7 +42,6 @@ test_make_tuple()
     constexpr tuple_type p1 = std::make_tuple(22, 22.222, 77799);
   }
 }
-#endif
 
 // get
 void
@@ -77,10 +75,7 @@ test_tuple_cat()
 int
 main()
 {
-#if 0
   test_make_tuple();
-#endif
-
   test_get();
   test_tuple_cat();
 

libstdc++-v3/testsuite/20_util/weak_ptr/comparison/cmp_neg.cc

@@ -51,7 +51,7 @@ main()
 // { dg-warning "note" "" { target *-*-* } 485 }
 // { dg-warning "note" "" { target *-*-* } 479 }
 // { dg-warning "note" "" { target *-*-* } 468 }
-// { dg-warning "note" "" { target *-*-* } 840 }
+// { dg-warning "note" "" { target *-*-* } 841 }
 // { dg-warning "note" "" { target *-*-* } 1056 }
 // { dg-warning "note" "" { target *-*-* } 1050 }
 // { dg-warning "note" "" { target *-*-* } 342 }