src/third_party/llvm-project/libcxx/test/std/experimental/language.support/support.coroutines/coroutine.handle/coroutine.handle.capacity/operator_bool.pass.cpp

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++98, c++03, c++11

// <experimental/coroutine>

// template <class Promise = void>
// struct coroutine_handle;

// constexpr explicit operator bool() const noexcept

#include <experimental/coroutine>
#include <type_traits>
#include <cassert>

#include "test_macros.h"

namespace coro = std::experimental;

template <class C>
void do_test() {
  static_assert(std::is_nothrow_constructible<bool, C>::value, "");
  static_assert(!std::is_convertible<C, bool>::value, "");
  {
    constexpr C c; ((void)c);
    static_assert(bool(c) == false, "");
  }
  { // null case
    const C c = {}; ((void)c);
    ASSERT_NOEXCEPT(bool(c));
    if (c)
      assert(false);
    else
      assert(true);
    assert(c.address() == nullptr);
    assert(bool(c) == false);
  }
  { // non-null case
    char dummy = 42;
    C c = C::from_address((void*)&dummy);
    assert(c.address() == &dummy);
    assert(bool(c) == true);
  }
}

int main()
{
  do_test<coro::coroutine_handle<>>();
  do_test<coro::coroutine_handle<int>>();
}