libcxx/test/std/containers/sequences/array/contiguous.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 // <array>
  10
  11 // An array is a contiguous container
  12
  13 #include <array>
  14 #include <cassert>
  15 #include <memory>
  16
  17 #include "test_macros.h"
  18
  19 template <class Container>
  20 TEST_CONSTEXPR_CXX14 void assert_contiguous(Container const& c)
  21 {
  22     for (std::size_t i = 0; i < c.size(); ++i)
  23         assert(*(c.begin() + i) == *(std::addressof(*c.begin()) + i));
  24 }
  25
  26 TEST_CONSTEXPR_CXX17 bool tests()
  27 {
  28     assert_contiguous(std::array<double, 0>());
  29     assert_contiguous(std::array<double, 1>());
  30     assert_contiguous(std::array<double, 2>());
  31     assert_contiguous(std::array<double, 3>());
  32
  33     assert_contiguous(std::array<char, 0>());
  34     assert_contiguous(std::array<char, 1>());
  35     assert_contiguous(std::array<char, 2>());
  36     assert_contiguous(std::array<char, 3>());
  37
  38     return true;
  39 }
  40
  41 int main(int, char**)
  42 {
  43     tests();
  44 #if TEST_STD_VER >= 17 // begin() & friends are constexpr in >= C++17 only
  45     static_assert(tests(), "");
  46 #endif
  47     return 0;
  48 }