libcxx/test/std/containers/views/mdspan/default_accessor/access.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 // constexpr reference access(data_handle_type p, size_t i) const noexcept;
  14 //
  15 // Effects: Equivalent to: return p[i];
  16
  17 #include <mdspan>
  18 #include <cassert>
  19 #include <type_traits>
  20
  21 #include "test_macros.h"
  22
  23 #include "../MinimalElementType.h"
  24
  25 template <class T>
  26 constexpr void test_access() {
  27   ElementPool<std::remove_const_t<T>, 10> data;
  28   T* ptr = data.get_ptr();
  29   std::default_accessor<T> acc;
  30   for(int i = 0; i < 10; i++) {
  31     static_assert(std::is_same_v<decltype(acc.access(ptr, i)), typename std::default_accessor<T>::reference>);
  32     ASSERT_NOEXCEPT(acc.access(ptr, i));
  33     assert(&acc.access(ptr, i) == ptr + i);
  34   }
  35 }
  36
  37 constexpr bool test() {
  38   test_access<int>();
  39   test_access<const int>();
  40   test_access<MinimalElementType>();
  41   test_access<const MinimalElementType>();
  42   return true;
  43 }
  44
  45 int main(int, char**) {
  46   test();
  47   static_assert(test());
  48   return 0;
  49 }