libstdc++-v3/testsuite/20_util/pair/astuple/astuple.cc

   1 // { dg-do compile }
   2 // { dg-options "-std=gnu++11" }
   3
   4 // Copyright (C) 2013 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11 //
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <utility>
  22 #include <type_traits>
  23
  24 typedef std::pair<int, long> test_type;
  25
  26 static_assert( std::tuple_size<test_type>::value == 2, "size is 2" );
  27
  28 template<std::size_t N, typename T>
  29   using Tuple_elt = typename std::tuple_element<N, T>::type;
  30
  31 using std::is_same;
  32
  33 static_assert( is_same<Tuple_elt<0, test_type>, test_type::first_type>::value,
  34                "first type is int" );
  35
  36 static_assert( is_same<Tuple_elt<1, test_type>, test_type::second_type>::value,
  37                "second type is long" );