346a29908e
Found while running libc++'s test suite with MSVC's STL. This is structured into a series of commits for easier reviewing; I could also split this into smaller PRs if desired. * Add void-casts for `invoke_r` calls to fix MSVC STL `[[nodiscard]]` warnings. + Our rationale is that if someone is calling `invoke_r<NonVoidType>`, it sure looks like they care about the return value. * Add `[[maybe_unused]]` to silence `-Wunused-parameter` warnings. + This happens because the parameters are used within `LIBCPP_ASSERT`, which vanishes for MSVC's STL. This also motivates the following changes. * Add `[[maybe_unused]]` to fix `-Wunused-variable` warnings. * Always void-cast `debug_comparisons` to fix `-Wunused-variable` warnings. + As this was already unused with a void-cast in one `_LIBCPP_HARDENING_MODE` branch, I'm simply lifting it next to the variable definition. * Add `[[maybe_unused]]` to fix `-Wunused-local-typedef` warnings.
66 lines
2.3 KiB
C++
66 lines
2.3 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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//
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// UNSUPPORTED: no-threads
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// LWG 2056 changed the values of future_errc, so if we're using new headers
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// with an old library we'll get incorrect messages.
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//
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// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11}}
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// VC Runtime's std::exception::what() method is not marked as noexcept, so
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// this fails.
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// UNSUPPORTED: target=x86_64-pc-windows-msvc
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// <future>
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//
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// class future_error
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//
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// const char* what() const noexcept;
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#include <cassert>
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#include <future>
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#include <string_view>
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#include <utility>
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#include "test_macros.h"
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int main(int, char**) {
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ASSERT_NOEXCEPT(std::declval<std::future_error const&>().what());
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ASSERT_SAME_TYPE(decltype(std::declval<std::future_error const&>().what()), char const*);
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// Before C++17, we can't construct std::future_error directly in a standards-conforming way
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#if TEST_STD_VER >= 17
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{
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std::future_error const f(std::future_errc::broken_promise);
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[[maybe_unused]] char const* what = f.what();
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LIBCPP_ASSERT(what == std::string_view{"The associated promise has been destructed prior "
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"to the associated state becoming ready."});
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}
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{
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std::future_error f(std::future_errc::future_already_retrieved);
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[[maybe_unused]] char const* what = f.what();
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LIBCPP_ASSERT(what == std::string_view{"The future has already been retrieved from "
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"the promise or packaged_task."});
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}
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{
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std::future_error f(std::future_errc::promise_already_satisfied);
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[[maybe_unused]] char const* what = f.what();
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LIBCPP_ASSERT(what == std::string_view{"The state of the promise has already been set."});
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}
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{
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std::future_error f(std::future_errc::no_state);
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[[maybe_unused]] char const* what = f.what();
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LIBCPP_ASSERT(what == std::string_view{"Operation not permitted on an object without "
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"an associated state."});
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}
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#endif
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return 0;
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}
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