libcxx/test/std/containers/sequences/array/array.tuple/get_const.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 // template <size_t I, class T, size_t N> const T& get(const array<T, N>& a);
  12
  13 #include <array>
  14 #include <cassert>
  15
  16 #include "test_macros.h"
  17
  18 // std::array is explicitly allowed to be initialized with A a = { init-list };.
  19 // Disable the missing braces warning for this reason.
  20 #include "disable_missing_braces_warning.h"
  21
  22 TEST_CONSTEXPR_CXX14 bool tests()
  23 {
  24     {
  25         std::array<double, 1> const array = {3.3};
  26         assert(std::get<0>(array) == 3.3);
  27     }
  28     {
  29         std::array<double, 2> const array = {3.3, 4.4};
  30         assert(std::get<0>(array) == 3.3);
  31         assert(std::get<1>(array) == 4.4);
  32     }
  33     {
  34         std::array<double, 3> const array = {3.3, 4.4, 5.5};
  35         assert(std::get<0>(array) == 3.3);
  36         assert(std::get<1>(array) == 4.4);
  37         assert(std::get<2>(array) == 5.5);
  38     }
  39     {
  40         std::array<double, 1> const array = {3.3};
  41         static_assert(std::is_same<double const&, decltype(std::get<0>(array))>::value, "");
  42     }
  43
  44     return true;
  45 }
  46
  47 int main(int, char**)
  48 {
  49     tests();
  50 #if TEST_STD_VER >= 14
  51     static_assert(tests(), "");
  52 #endif
  53     return 0;
  54 }