libcxx/test/std/containers/views/span.tuple/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 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
   9
  10 // <span>
  11
  12 // tuple_size<span<T, N> >::value
  13
  14 #include <span>
  15
  16 #include "test_macros.h"
  17
  18 template <class T, std::size_t N>
  19 void test()
  20 {
  21     {
  22     typedef std::span<T, N> C;
  23     static_assert((std::tuple_size<C>::value == N), "");
  24     }
  25     {
  26     typedef std::span<T const, N> C;
  27     static_assert((std::tuple_size<C>::value == N), "");
  28     }
  29     {
  30     typedef std::span<T volatile, N> C;
  31     static_assert((std::tuple_size<C>::value == N), "");
  32     }
  33     {
  34     typedef std::span<T const volatile, N> C;
  35     static_assert((std::tuple_size<C>::value == N), "");
  36     }
  37 }
  38
  39 int main(int, char**)
  40 {
  41     test<double, 0>();
  42     test<double, 3>();
  43     test<double, 5>();
  44
  45   return 0;
  46 }