3476b56f0c
These macros are intended to replace the macros in rapid-cxx-test.h. Reviewed By: #libc, ldionne Differential Revision: https://reviews.llvm.org/D142808
54 lines
1.8 KiB
C++
54 lines
1.8 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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#ifndef TEST_SUPPORT_CONCAT_MACROS_H
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#define TEST_SUPPORT_CONCAT_MACROS_H
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#include <cstdio>
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#include <string>
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#include "test_macros.h"
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#ifndef TEST_HAS_NO_LOCALIZATION
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# include <sstream>
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#endif
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#if TEST_STD_VER > 17
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# ifndef TEST_HAS_NO_LOCALIZATION
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template <class T>
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concept test_char_streamable = requires(T&& value) { std::stringstream{} << std::forward<T>(value); };
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# endif
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// If possible concatenates message for the assertion function, else returns a
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// default message. Not being able to stream is not considered and error. For
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// example, streaming to std::wcerr doesn't work properly in the CI. Therefore
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// the formatting tests should only stream to std::string.
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//
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// The macro TEST_WRITE_CONCATENATED can be used to evaluate the arguments
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// lazily. This useful when using this function in combination with
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// assert_macros.h.
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template <class... Args>
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std::string test_concat_message([[maybe_unused]] Args&&... args) {
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# ifndef TEST_HAS_NO_LOCALIZATION
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if constexpr ((test_char_streamable<Args> && ...)) {
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std::stringstream sstr;
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((sstr << std::forward<Args>(args)), ...);
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return sstr.str();
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} else
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# endif
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return "Message discarded since it can't be streamed to std::cerr.\n";
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}
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// Writes its arguments to stderr, using the test_concat_message helper.
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# define TEST_WRITE_CONCATENATED(...) [&] { ::std::fprintf(stderr, "%s", ::test_concat_message(__VA_ARGS__).c_str()); }
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#endif // TEST_STD_VER > 17
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#endif // TEST_SUPPORT_CONCAT_MACROS_H
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