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 int main(int, char**)
  23 {
  24     {
  25         typedef double T;
  26         typedef std::array<T, 3> C;
  27         const C c = {1, 2, 3.5};
  28         assert(std::get<0>(c) == 1);
  29         assert(std::get<1>(c) == 2);
  30         assert(std::get<2>(c) == 3.5);
  31     }
  32 #if TEST_STD_VER > 11
  33     {
  34         typedef double T;
  35         typedef std::array<T, 3> C;
  36         constexpr const C c = {1, 2, 3.5};
  37         static_assert(std::get<0>(c) == 1, "");
  38         static_assert(std::get<1>(c) == 2, "");
  39         static_assert(std::get<2>(c) == 3.5, "");
  40     }
  41 #endif
  42
  43   return 0;
  44 }