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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef TEST_SUPPORT_CONCAT_MACROS_H
#define TEST_SUPPORT_CONCAT_MACROS_H
#include <cstdio>
#include <string>
#include "assert_macros.h"
#include "test_macros.h"
#ifndef TEST_HAS_NO_LOCALIZATION
# include <sstream>
#endif
#if TEST_STD_VER > 17
# ifndef TEST_HAS_NO_LOCALIZATION
template <class T>
concept test_char_streamable = requires(T&& value) { std::stringstream{} << std::forward<T>(value); };
# endif
// If possible concatenates message for the assertion function, else returns a
// default message. Not being able to stream is not considered and error. For
// example, streaming to std::wcerr doesn't work properly in the CI. Therefore
// the formatting tests should only stream to std::string.
//
// The macro TEST_WRITE_CONCATENATED can be used to evaluate the arguments
// lazily. This useful when using this function in combination with
// assert_macros.h.
template <class... Args>
std::string test_concat_message([[maybe_unused]] Args&&... args) {
# ifndef TEST_HAS_NO_LOCALIZATION
if constexpr ((test_char_streamable<Args> && ...)) {
std::stringstream sstr;
((sstr << std::forward<Args>(args)), ...);
return sstr.str();
} else
# endif
return "Message discarded since it can't be streamed to std::cerr.\n";
}
// Writes its arguments to stderr, using the test_concat_message helper.
# define TEST_WRITE_CONCATENATED(...) [&] { ::test_eprintf("%s", ::test_concat_message(__VA_ARGS__).c_str()); }
#else
// Fallback definition before C++20 that allows using the macro but doesn't provide a very good message.
# define TEST_WRITE_CONCATENATED(...) [&] { ::test_eprintf("%s", TEST_STRINGIZE(__VA_ARGS__)); }
#endif // TEST_STD_VER > 17
#endif // TEST_SUPPORT_CONCAT_MACROS_H
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