[patch] N3545 change to std::integral_constant

[Jonathan Wakely]

Another C++14 feature.

        * include/std/type-traits (integral_constant::operator()): Implement
        N3545.
        * testsuite/20_util/integral_constant/call_operator.cc: New.
        * testsuite/20_util/declval/requirements/1_neg.cc: Adjust dg-error
        line numbers.
        * testsuite/20_util/make_signed/requirements/typedefs_neg.cc:
        Likewise.
        * testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc:
        Likewise.

Tested x86_64-linux, committed to trunk.
-------------- next part --------------
commit e3b2b5a9475b7146469e6cb4c35a140c7506df63
Author: Jonathan Wakely <jwakely.gcc@gmail.com>
Date:   Sat Jun 8 16:45:53 2013 +0100

    	* include/std/type-traits (integral_constant::operator()): Implement
    	N3545.
    	* testsuite/20_util/integral_constant/call_operator.cc: New.
    	* testsuite/20_util/declval/requirements/1_neg.cc: Adjust dg-error
    	line numbers.
    	* testsuite/20_util/make_signed/requirements/typedefs_neg.cc:
    	Likewise.
    	* testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc:
    	Likewise.

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index a0a8327..99d0a5b 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -60,6 +60,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       typedef _Tp                           value_type;
       typedef integral_constant<_Tp, __v>   type;
       constexpr operator value_type() const { return value; }
+#if __cplusplus > 201103L
+      constexpr value_type operator()() const { return value; }
+#endif
     };
   
   template<typename _Tp, _Tp __v>
diff --git a/libstdc++-v3/testsuite/20_util/declval/requirements/1_neg.cc b/libstdc++-v3/testsuite/20_util/declval/requirements/1_neg.cc
index ad82190..5b5a8eb 100644
--- a/libstdc++-v3/testsuite/20_util/declval/requirements/1_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/declval/requirements/1_neg.cc
@@ -19,7 +19,7 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
-// { dg-error "static assertion failed" "" { target *-*-* } 1859 }
+// { dg-error "static assertion failed" "" { target *-*-* } 1862 }
 
 #include <utility>
 
diff --git a/libstdc++-v3/testsuite/20_util/integral_constant/call_operator.cc b/libstdc++-v3/testsuite/20_util/integral_constant/call_operator.cc
new file mode 100644
index 0000000..c5b0385
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/integral_constant/call_operator.cc
@@ -0,0 +1,36 @@
+// { dg-do compile }
+// { dg-options "-std=gnu++1y" }
+//
+// Copyright (C) 2013 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library 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.
+//
+// This library 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 library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <type_traits>
+#include <cassert> //testsuite_hooks.h>
+
+typedef std::integral_constant<int, 1>       ic_one;
+typedef std::integral_constant<int, 0>       ic_zero;
+typedef std::integral_constant<int, -1>      ic_minus_one;
+
+typedef std::integral_constant<bool, true>   ic_true;
+typedef std::integral_constant<bool, false>  ic_false;
+
+static_assert( ic_one{}() == 1, "1" );
+static_assert( ic_zero{}() == 0, "0" );
+static_assert( ic_minus_one{}() == -1, "-1" );
+
+static_assert( ic_true{}() == true, "true" );
+static_assert( ic_false{}() == false, "false" );
diff --git a/libstdc++-v3/testsuite/20_util/make_signed/requirements/typedefs_neg.cc b/libstdc++-v3/testsuite/20_util/make_signed/requirements/typedefs_neg.cc
index 077e327..afb7336 100644
--- a/libstdc++-v3/testsuite/20_util/make_signed/requirements/typedefs_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/make_signed/requirements/typedefs_neg.cc
@@ -48,5 +48,5 @@ void test01()
 // { dg-error "required from here" "" { target *-*-* } 40 }
 // { dg-error "required from here" "" { target *-*-* } 42 }
 
-// { dg-error "invalid use of incomplete type" "" { target *-*-* } 1601 }
-// { dg-error "declaration of" "" { target *-*-* } 1565 }
+// { dg-error "invalid use of incomplete type" "" { target *-*-* } 1604 }
+// { dg-error "declaration of" "" { target *-*-* } 1568 }
diff --git a/libstdc++-v3/testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc b/libstdc++-v3/testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc
index 2bc1cbb..ba5f582 100644
--- a/libstdc++-v3/testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc
@@ -48,5 +48,5 @@ void test01()
 // { dg-error "required from here" "" { target *-*-* } 40 }
 // { dg-error "required from here" "" { target *-*-* } 42 }
 
-// { dg-error "invalid use of incomplete type" "" { target *-*-* } 1519 }
-// { dg-error "declaration of" "" { target *-*-* } 1483 }
+// { dg-error "invalid use of incomplete type" "" { target *-*-* } 1522 }
+// { dg-error "declaration of" "" { target *-*-* } 1486 }