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 // GCC 5 doesn't implement the required constexpr support
  12 // UNSUPPORTED: gcc-5
  13
  14 // An array is a contiguous container
  15
  16 #include <array>
  17 #include <cassert>
  18
  19 #include "test_macros.h"
  20
  21 template <class Container>
  22 TEST_CONSTEXPR_CXX14 void assert_contiguous(Container const& c)
  23 {
  24     for (size_t i = 0; i < c.size(); ++i)
  25         assert(*(c.begin() + i) == *(std::addressof(*c.begin()) + i));
  26 }
  27
  28 TEST_CONSTEXPR_CXX17 bool tests()
  29 {
  30     assert_contiguous(std::array<double, 0>());
  31     assert_contiguous(std::array<double, 1>());
  32     assert_contiguous(std::array<double, 2>());
  33     assert_contiguous(std::array<double, 3>());
  34
  35     assert_contiguous(std::array<char, 0>());
  36     assert_contiguous(std::array<char, 1>());
  37     assert_contiguous(std::array<char, 2>());
  38     assert_contiguous(std::array<char, 3>());
  39
  40     return true;
  41 }
  42
  43 int main(int, char**)
  44 {
  45     tests();
  46 #if TEST_STD_VER >= 17 // begin() & friends are constexpr in >= C++17 only
  47     static_assert(tests(), "");
  48 #endif
  49     return 0;
  50 }