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

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2007-2022 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 // Tuple
  21
  22 #include <tuple>
  23 #include <testsuite_hooks.h>
  24
  25 using namespace std;
  26
  27 int
  28 main()
  29 {
  30   static_assert(tuple_size<tuple<>>::value == 0, "");
  31   static_assert(tuple_size<tuple<int>>::value == 1, "");
  32   static_assert(tuple_size<tuple<void>>::value == 1, "");
  33   typedef tuple<int,const int&,void> test_tuple1;
  34   static_assert(tuple_size<test_tuple1>::value == 3, "");
  35   static_assert(tuple_size<tuple<tuple<void>>>::value == 1, "");
  36
  37   static_assert(tuple_size<const tuple<>>::value == 0, "");
  38   static_assert(tuple_size<const tuple<int>>::value == 1, "");
  39   static_assert(tuple_size<const tuple<void>>::value == 1, "");
  40   static_assert(tuple_size<const test_tuple1>::value == 3, "");
  41   static_assert(tuple_size<const tuple<tuple<void>>>::value == 1, "");
  42
  43   static_assert(tuple_size<volatile tuple<>>::value == 0, "");
  44   static_assert(tuple_size<volatile tuple<int>>::value == 1, "");
  45   static_assert(tuple_size<volatile tuple<void>>::value == 1, "");
  46   static_assert(tuple_size<volatile test_tuple1>::value == 3, "");
  47   static_assert(tuple_size<volatile tuple<tuple<void>>>::value == 1, "");
  48
  49   static_assert(tuple_size<const volatile tuple<>>::value == 0, "");
  50   static_assert(tuple_size<const volatile tuple<int>>::value == 1, "");
  51   static_assert(tuple_size<const volatile tuple<void>>::value == 1, "");
  52   static_assert(tuple_size<const volatile test_tuple1>::value == 3, "");
  53   static_assert(tuple_size<const volatile tuple<tuple<void>>>::value == 1,"");
  54 }