libstdc++-v3/testsuite/experimental/tuple/tuple_size.cc

   1 // { dg-do compile { target c++14 } }
   2
   3 // Copyright (C) 2014-2017 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <experimental/tuple>
  21
  22 using std::tuple;
  23 using std::tuple_size;
  24 using std::experimental::tuple_size_v;
  25
  26 // These tests are rather simple, the front-end tests already test
  27 // variable templates, and the library tests for the underlying
  28 // traits are more elaborate. These are just simple sanity tests.
  29
  30 static_assert(tuple_size_v<tuple<int>> == 1
  31               && tuple_size<tuple<int>>::value == 1, "");
  32
  33 static_assert(tuple_size_v<tuple<int, int>> == 2
  34               && tuple_size<tuple<int, int>>::value == 2, "");