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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: libcpp-has-no-incomplete-format
// TODO FMT Evaluate gcc-12 status
// UNSUPPORTED: gcc-12
// TODO FMT Investigate AppleClang ICE
// UNSUPPORTED: apple-clang-13
// <format>
// template<class Out, class... Args>
// Out format_to(Out out, const locale& loc,
// format-string<Args...> fmt, const Args&... args);
// template<class Out, class... Args>
// Out format_to(Out out, const locale& loc,
// wformat-string<Args...> fmt, const Args&... args);
#include <format>
#include <algorithm>
#include <cassert>
#include <list>
#include <vector>
#include "test_macros.h"
#include "format_tests.h"
#include "string_literal.h"
auto test = []<string_literal fmt, class CharT, class... Args>(std::basic_string_view<CharT> expected,
const Args&... args) constexpr {
{
std::basic_string<CharT> out(expected.size(), CharT(' '));
auto it = std::format_to(out.begin(), std::locale(), fmt.template sv<CharT>(), args...);
assert(it == out.end());
assert(out == expected);
}
{
std::list<CharT> out;
std::format_to(std::back_inserter(out), std::locale(), fmt.template sv<CharT>(), args...);
assert(std::equal(out.begin(), out.end(), expected.begin(), expected.end()));
}
{
std::vector<CharT> out;
std::format_to(std::back_inserter(out), std::locale(), fmt.template sv<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::format_to(out, std::locale(), fmt.template sv<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, std::basic_string_view<CharT>, const Args&...) {
// After P2216 most exceptions thrown by std::format_to become ill-formed.
// Therefore this tests does nothing.
// A basic ill-formed test is done in format_to.locale.verify.cpp
// The exceptions are tested by other functions that don't use the basic-format-string as fmt argument.
};
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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