libstdc++-v3/testsuite/20_util/tuple/tuple_size.cc

// { dg-do compile { target c++11 } }

// Copyright (C) 2007-2023 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/>.

// Tuple

#include <tuple>
#include <testsuite_hooks.h>

using namespace std;

int
main()
{
  static_assert(tuple_size<tuple<>>::value == 0, "");
  static_assert(tuple_size<tuple<int>>::value == 1, "");
  static_assert(tuple_size<tuple<void>>::value == 1, "");
  typedef tuple<int,const int&,void> test_tuple1;
  static_assert(tuple_size<test_tuple1>::value == 3, "");
  static_assert(tuple_size<tuple<tuple<void>>>::value == 1, "");

  static_assert(tuple_size<const tuple<>>::value == 0, "");
  static_assert(tuple_size<const tuple<int>>::value == 1, "");
  static_assert(tuple_size<const tuple<void>>::value == 1, "");
  static_assert(tuple_size<const test_tuple1>::value == 3, "");
  static_assert(tuple_size<const tuple<tuple<void>>>::value == 1, "");

  static_assert(tuple_size<volatile tuple<>>::value == 0, "");
  static_assert(tuple_size<volatile tuple<int>>::value == 1, "");
  static_assert(tuple_size<volatile tuple<void>>::value == 1, "");
  static_assert(tuple_size<volatile test_tuple1>::value == 3, "");
  static_assert(tuple_size<volatile tuple<tuple<void>>>::value == 1, "");

  static_assert(tuple_size<const volatile tuple<>>::value == 0, "");
  static_assert(tuple_size<const volatile tuple<int>>::value == 1, "");
  static_assert(tuple_size<const volatile tuple<void>>::value == 1, "");
  static_assert(tuple_size<const volatile test_tuple1>::value == 3, "");
  static_assert(tuple_size<const volatile tuple<tuple<void>>>::value == 1,"");
}