libcxx/test/std/utilities/utility/pairs/pair.astuple/tuple_size.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <utility>
  10
  11 // template <class T1, class T2> struct pair
  12
  13 // tuple_size<pair<T1, T2> >::value
  14
  15 #include <utility>
  16
  17 #include "test_macros.h"
  18
  19 int main(int, char**)
  20 {
  21     {
  22         typedef std::pair<int, short> P1;
  23         static_assert((std::tuple_size<P1>::value == 2), "");
  24     }
  25     {
  26         typedef std::pair<int, short> const P1;
  27         static_assert((std::tuple_size<P1>::value == 2), "");
  28     }
  29     {
  30         typedef std::pair<int, short> volatile P1;
  31         static_assert((std::tuple_size<P1>::value == 2), "");
  32     }
  33     {
  34         typedef std::pair<int, short> const volatile P1;
  35         static_assert((std::tuple_size<P1>::value == 2), "");
  36     }
  37
  38   return 0;
  39 }