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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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: libcpp-no-concepts
// UNSUPPORTED: libcpp-has-no-incomplete-format
// TODO FMT Evaluate gcc-11 status
// UNSUPPORTED: gcc-11
// The tests write fixed size buffer, make sure it remains in bounds.
// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DEBUG=1
// UNSUPPORTED: libcxx-no-debug-mode
// <format>
// template<class Out>
// Out vformat_to(Out out, string_view fmt, format_args args);
// template<class Out>
// Out vformat_to(Out out, wstring_view fmt, wformat_args_t args);
#include <format>
#include <algorithm>
#include <cassert>
#include <list>
#include <vector>
#include "test_macros.h"
#include "format_tests.h"
auto test = []<class CharT, class... Args>(std::basic_string<CharT> expected, std::basic_string<CharT> fmt,
const Args&... args) {
{
std::basic_string<CharT> out(expected.size(), CharT(' '));
auto it = std::vformat_to(out.begin(), fmt, std::make_format_args<context_t<CharT>>(args...));
assert(it == out.end());
assert(out == expected);
}
{
std::list<CharT> out;
std::vformat_to(std::back_inserter(out), fmt, std::make_format_args<context_t<CharT>>(args...));
assert(std::equal(out.begin(), out.end(), expected.begin(), expected.end()));
}
{
std::vector<CharT> out;
std::vformat_to(std::back_inserter(out), fmt, std::make_format_args<context_t<CharT>>(args...));
assert(std::equal(out.begin(), out.end(), expected.begin(), expected.end()));
}
{
assert(expected.size() < 4096 && "Update the size of the buffer.");
CharT out[4096];
CharT* it = std::vformat_to(out, fmt, std::make_format_args<context_t<CharT>>(args...));
assert(std::distance(out, it) == int(expected.size()));
// Convert to std::string since output contains '\0' for boolean tests.
assert(std::basic_string<CharT>(out, it) == expected);
}
};
auto test_exception =
[]<class CharT, class... Args>(std::string_view what, std::basic_string<CharT> fmt, const Args&... args) {
#ifndef TEST_HAS_NO_EXCEPTIONS
try {
std::basic_string<CharT> out;
std::vformat_to(std::back_inserter(out), fmt, std::make_format_args<context_t<CharT>>(args...));
assert(false);
} catch ([[maybe_unused]] std::format_error& e) {
LIBCPP_ASSERT(e.what() == what);
return;
}
assert(false);
#endif
(void)what;
(void)fmt;
(void)sizeof...(args);
};
int main(int, char**) {
format_tests<char>(test, test_exception);
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
format_tests_char_to_wchar_t(test);
format_tests<wchar_t>(test, test_exception);
#endif
return 0;
}
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