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74 lines
1.7 KiB
C++
74 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// <optional>
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// constexpr T* optional<T>::operator->();
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#ifdef _LIBCPP_DEBUG
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#define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : std::exit(0))
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#endif
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#include <optional>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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using std::optional;
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struct X
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{
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int test() noexcept {return 3;}
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};
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struct Y
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{
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constexpr int test() {return 3;}
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};
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constexpr int
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test()
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{
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optional<Y> opt{Y{}};
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return opt->test();
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}
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int main(int, char**)
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{
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{
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std::optional<X> opt; ((void)opt);
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ASSERT_SAME_TYPE(decltype(opt.operator->()), X*);
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// ASSERT_NOT_NOEXCEPT(opt.operator->());
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// FIXME: This assertion fails with GCC because it can see that
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// (A) operator->() is constexpr, and
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// (B) there is no path through the function that throws.
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// It's arguable if this is the correct behavior for the noexcept
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// operator.
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// Regardless this function should still be noexcept(false) because
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// it has a narrow contract.
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}
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{
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optional<X> opt(X{});
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assert(opt->test() == 3);
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}
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{
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static_assert(test() == 3, "");
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}
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#ifdef _LIBCPP_DEBUG
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{
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optional<X> opt;
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assert(opt->test() == 3);
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assert(false);
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}
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#endif // _LIBCPP_DEBUG
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return 0;
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}
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