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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: no-localization
// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
// XFAIL: availability-fp_to_chars-missing
// <format>
// template<class Out>
// Out vformat_to(Out out, const locale& loc, string_view fmt,
// format_args args);
// template<class Out>
// Out vformat_to(Out out, const locale& loc, wstring_view fmt,
// wformat_args args);
#include <format>
#include <algorithm>
#include <cassert>
#include <list>
#include <vector>
#include "assert_macros.h"
#include "concat_macros.h"
#include "format_tests.h"
#include "string_literal.h"
auto test = []<class CharT, class... Args>(
std::basic_string_view<CharT> expected, std::basic_string_view<CharT> fmt, Args&&... args) constexpr {
{
std::basic_string<CharT> out(expected.size(), CharT(' '));
auto it = std::vformat_to(out.begin(), std::locale(), 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), std::locale(), 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), std::locale(), 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, std::locale(), 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>([[maybe_unused]] std::string_view what,
[[maybe_unused]] std::basic_string_view<CharT> fmt,
[[maybe_unused]] Args&&... args) {
TEST_VALIDATE_EXCEPTION(
std::format_error,
[&]([[maybe_unused]] const std::format_error& e) {
TEST_LIBCPP_REQUIRE(
e.what() == what,
TEST_WRITE_CONCATENATED(
"\nFormat string ", fmt, "\nExpected exception ", what, "\nActual exception ", e.what(), '\n'));
},
[&] {
std::basic_string<CharT> out;
std::vformat_to(std::back_inserter(out), std::locale(), fmt, std::make_format_args<context_t<CharT>>(args...));
}());
};
int main(int, char**) {
format_tests<char, execution_modus::partial>(test, test_exception);
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
format_tests_char_to_wchar_t(test);
format_tests<wchar_t, execution_modus::partial>(test, test_exception);
#endif
return 0;
}
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