libcxx/test/std/thread/thread.semaphore/ctor.compile.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 // UNSUPPORTED: no-threads
  10 // UNSUPPORTED: c++03, c++11
  11
  12 // <semaphore>
  13
  14 // constexpr explicit counting_semaphore(ptrdiff_t desired);
  15
  16 #include <semaphore>
  17 #include <type_traits>
  18
  19 #include "test_macros.h"
  20
  21 static_assert(!std::is_default_constructible<std::binary_semaphore>::value, "");
  22 static_assert(!std::is_default_constructible<std::counting_semaphore<>>::value, "");
  23
  24 static_assert(!std::is_convertible<int, std::binary_semaphore>::value, "");
  25 static_assert(!std::is_convertible<int, std::counting_semaphore<>>::value, "");
  26
  27 #if TEST_STD_VER > 17
  28 // Test constexpr-constructibility. (But not destructibility.)
  29 constinit std::binary_semaphore bs(1);
  30 constinit std::counting_semaphore<> cs(1);
  31 #endif