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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, c++20
// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
// <format>
// template<class charT, formattable<charT>... Ts>
// struct formatter<pair-or-tuple<Ts...>, charT>
// template<class ParseContext>
// constexpr typename ParseContext::iterator
// parse(ParseContext& ctx);
// Note this tests the basics of this function. It's tested in more detail in
// the format functions tests.
#include <cassert>
#include <concepts>
#include <format>
#include <memory>
#include <tuple>
#include <utility>
#include "test_macros.h"
#include "make_string.h"
#define SV(S) MAKE_STRING_VIEW(CharT, S)
template <class Arg, class StringViewT>
constexpr void test(StringViewT fmt, std::size_t offset) {
using CharT = typename StringViewT::value_type;
auto parse_ctx = std::basic_format_parse_context<CharT>(fmt);
std::formatter<Arg, CharT> formatter;
static_assert(std::semiregular<decltype(formatter)>);
std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx);
// std::to_address works around LWG3989 and MSVC STL's iterator debugging mechanism.
assert(std::to_address(it) == std::to_address(fmt.end()) - offset);
}
template <class CharT, class Arg>
constexpr void test() {
test<Arg>(SV(""), 0);
test<Arg>(SV("42"), 0);
test<Arg>(SV("}"), 1);
test<Arg>(SV("42}"), 1);
}
template <class CharT>
constexpr void test() {
test<CharT, std::tuple<int>>();
test<CharT, std::tuple<int, CharT>>();
test<CharT, std::pair<int, CharT>>();
test<CharT, std::tuple<int, CharT, bool>>();
}
constexpr bool test() {
test<char>();
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test<wchar_t>();
#endif
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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