libcxx/test/std/containers/views/mdspan/layout_left/properties.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 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
  10
  11 // <mdspan>
  12
  13 // namespace std {
  14 //   template<class Extents>
  15 //   class layout_left::mapping {
  16 //
  17 //     ...
  18 //     static constexpr bool is_always_unique() noexcept { return true; }
  19 //     static constexpr bool is_always_exhaustive() noexcept { return true; }
  20 //     static constexpr bool is_always_strided() noexcept { return true; }
  21 //
  22 //     static constexpr bool is_unique() noexcept { return true; }
  23 //     static constexpr bool is_exhaustive() noexcept { return true; }
  24 //     static constexpr bool is_strided() noexcept { return true; }
  25 //     ...
  26 //   };
  27 // }
  28
  29 #include <cassert>
  30 #include <cstddef>
  31 #include <mdspan>
  32 #include <span> // dynamic_extent
  33 #include <utility>
  34
  35 #include "test_macros.h"
  36
  37 template <class E>
  38 constexpr void test_layout_mapping_left() {
  39   using M = std::layout_left::mapping<E>;
  40   assert(M::is_unique() == true);
  41   assert(M::is_exhaustive() == true);
  42   assert(M::is_strided() == true);
  43   assert(M::is_always_unique() == true);
  44   assert(M::is_always_exhaustive() == true);
  45   assert(M::is_always_strided() == true);
  46   ASSERT_NOEXCEPT(std::declval<M>().is_unique());
  47   ASSERT_NOEXCEPT(std::declval<M>().is_exhaustive());
  48   ASSERT_NOEXCEPT(std::declval<M>().is_strided());
  49   ASSERT_NOEXCEPT(M::is_always_unique());
  50   ASSERT_NOEXCEPT(M::is_always_exhaustive());
  51   ASSERT_NOEXCEPT(M::is_always_strided());
  52 }
  53
  54 constexpr bool test() {
  55   constexpr size_t D = std::dynamic_extent;
  56   test_layout_mapping_left<std::extents<int>>();
  57   test_layout_mapping_left<std::extents<signed char, 4, 5>>();
  58   test_layout_mapping_left<std::extents<unsigned, D, 4>>();
  59   test_layout_mapping_left<std::extents<size_t, D, D, D, D>>();
  60   return true;
  61 }
  62
  63 int main(int, char**) {
  64   test();
  65   static_assert(test());
  66   return 0;
  67 }