libcxx/test/std/containers/sequences/array/empty.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 // class array
  12
  13 // constexpr bool empty() const noexcept;
  14
  15 #include <array>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19
  20 TEST_CONSTEXPR_CXX14 bool tests()
  21 {
  22     {
  23         typedef std::array<int, 2> C;
  24         C c = {};
  25         ASSERT_NOEXCEPT(c.empty());
  26         assert(!c.empty());
  27     }
  28     {
  29         typedef std::array<int, 0> C;
  30         C c = {};
  31         ASSERT_NOEXCEPT(c.empty());
  32         assert(c.empty());
  33     }
  34
  35     return true;
  36 }
  37
  38 int main(int, char**)
  39 {
  40     tests();
  41 #if TEST_STD_VER >= 14
  42     static_assert(tests(), "");
  43 #endif
  44
  45 #if TEST_STD_VER >= 11
  46     // Sanity check for constexpr in C++11
  47     {
  48         constexpr std::array<int, 3> array = {};
  49         static_assert(!array.empty(), "");
  50     }
  51 #endif
  52
  53     return 0;
  54 }