//===----------------------------------------------------------------------===//
//
// 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, c++23
// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
// The tested functionality needs deducing this.
// UNSUPPORTED: clang-17
// XFAIL: apple-clang
// <format>
// class basic_format_arg;
// template<class R, class Visitor>
// R visit(this basic_format_arg arg, Visitor&& vis);
#include <algorithm>
#include <cassert>
#include <format>
#include <type_traits>
#include "constexpr_char_traits.h"
#include "make_string.h"
#include "min_allocator.h"
#include "test_macros.h"
// The expected result type shouldn't matter,therefore use a hardcoded value for simplicity.
using ExpectedResultType = bool;
constexpr ExpectedResultType visited{true};
template <class ExpectedR>
ExpectedR make_expected_result() {
if constexpr (std::is_same_v<ExpectedR, bool>) {
return true;
} else if constexpr (std::is_same_v<ExpectedR, long>) {
return 192812079084L;
} else {
return "visited";
}
}
template <class Context, class To, class ExpectedR, class From>
void test(From value, const ExpectedR& expectedValue) {
auto store = std::make_format_args<Context>(value);
std::basic_format_args<Context> format_args{store};
LIBCPP_ASSERT(format_args.__size() == 1);
assert(format_args.get(0));
// member
{
std::same_as<ExpectedR> decltype(auto) result =
format_args.get(0).template visit<ExpectedR>([v = To(value)](auto a) -> ExpectedR {
if constexpr (std::is_same_v<To, decltype(a)>) {
assert(v == a);
return make_expected_result<ExpectedR>();
} else {
assert(false);
return {};
}
});
assert(result == expectedValue);
}
}
// Some types, as an extension, are stored in the variant. The Standard
// requires them to be observed as a handle.
template <class Context, class T, class ExpectedR>
void test_handle(T value, ExpectedR expectedValue) {
auto store = std::make_format_args<Context>(value);
std::basic_format_args<Context> format_args{store};
LIBCPP_ASSERT(format_args.__size() == 1);
assert(format_args.get(0));
std::same_as<ExpectedR> decltype(auto) result = format_args.get(0).template visit<ExpectedR>([](auto a) -> ExpectedR {
assert((std::is_same_v<decltype(a), typename std::basic_format_arg<Context>::handle>));
return make_expected_result<ExpectedR>();
});
assert(result == expectedValue);
}
// Test specific for string and string_view.
//
// Since both result in a string_view there's no need to pass this as a
// template argument.
template <class Context, class ExpectedR, class From>
void test_string_view(From value, ExpectedR expectedValue) {
auto store = std::make_format_args<Context>(value);
std::basic_format_args<Context> format_args{store};
LIBCPP_ASSERT(format_args.__size() == 1);
assert(format_args.get(0));
using CharT = typename Context::char_type;
using To = std::basic_string_view<CharT>;
using V = std::basic_string<CharT>;
std::same_as<ExpectedR> decltype(auto) result =
format_args.get(0).template visit<ExpectedR>([v = V(value.begin(), value.end())](auto a) -> ExpectedR {
if constexpr (std::is_same_v<To, decltype(a)>) {
assert(v == a);
return make_expected_result<ExpectedR>();
} else {
assert(false);
return {};
}
});
assert(result == expectedValue);
}
template <class CharT>
void test() {
using Context = std::basic_format_context<CharT*, CharT>;
std::basic_string<CharT> empty;
std::basic_string<CharT> str = MAKE_STRING(CharT, "abc");
// Test boolean types.
test<Context, bool, ExpectedResultType>(true, visited);
test<Context, bool, ExpectedResultType>(false, visited);
test<Context, bool, std::string>(true, "visited");
test<Context, bool, std::string>(false, "visited");
// Test CharT types.
test<Context, CharT, ExpectedResultType, CharT>('a', visited);
test<Context, CharT, ExpectedResultType, CharT>('z', visited);
test<Context, CharT, ExpectedResultType, CharT>('0', visited);
test<Context, CharT, ExpectedResultType, CharT>('9', visited);
// Test char types.
if (std::is_same_v<CharT, char>) {
// char to char -> char
test<Context, CharT, ExpectedResultType, char>('a', visited);
test<Context, CharT, ExpectedResultType, char>('z', visited);
test<Context, CharT, ExpectedResultType, char>('0', visited);
test<Context, CharT, ExpectedResultType, char>('9', visited);
} else {
if (std::is_same_v<CharT, wchar_t>) {
// char to wchar_t -> wchar_t
test<Context, wchar_t, ExpectedResultType, char>('a', visited);
test<Context, wchar_t, ExpectedResultType, char>('z', visited);
test<Context, wchar_t, ExpectedResultType, char>('0', visited);
test<Context, wchar_t, ExpectedResultType, char>('9', visited);
} else if (std::is_signed_v<char>) {
// char to CharT -> int
// This happens when CharT is a char8_t, char16_t, or char32_t and char
// is a signed type.
// Note if sizeof(CharT) > sizeof(int) this test fails. If there are
// platforms where that occurs extra tests need to be added for char32_t
// testing it against a long long.
test<Context, int, ExpectedResultType, char>('a', visited);
test<Context, int, ExpectedResultType, char>('z', visited);
test<Context, int, ExpectedResultType, char>('0', visited);
test<Context, int, ExpectedResultType, char>('9', visited);
} else {
// char to CharT -> unsigned
// This happens when CharT is a char8_t, char16_t, or char32_t and char
// is an unsigned type.
// Note if sizeof(CharT) > sizeof(unsigned) this test fails. If there are
// platforms where that occurs extra tests need to be added for char32_t
// testing it against an unsigned long long.
test<Context, unsigned, ExpectedResultType, char>('a', visited);
test<Context, unsigned, ExpectedResultType, char>('z', visited);
test<Context, unsigned, ExpectedResultType, char>('0', visited);
test<Context, unsigned, ExpectedResultType, char>('9', visited);
}
}
// Test signed integer types.
test<Context, int, ExpectedResultType, signed char>(std::numeric_limits<signed char>::min(), visited);
test<Context, int, ExpectedResultType, signed char>(0, visited);
test<Context, int, ExpectedResultType, signed char>(std::numeric_limits<signed char>::max(), visited);
test<Context, int, ExpectedResultType, short>(std::numeric_limits<short>::min(), visited);
test<Context, int, ExpectedResultType, short>(std::numeric_limits<signed char>::min(), visited);
test<Context, int, ExpectedResultType, short>(0, visited);
test<Context, int, ExpectedResultType, short>(std::numeric_limits<signed char>::max(), visited);
test<Context, int, ExpectedResultType, short>(std::numeric_limits<short>::max(), visited);
test<Context, int, ExpectedResultType, int>(std::numeric_limits<int>::min(), visited);
test<Context, int, ExpectedResultType, int>(std::numeric_limits<short>::min(), visited);
test<Context, int, ExpectedResultType, int>(std::numeric_limits<signed char>::min(), visited);
test<Context, int, ExpectedResultType, int>(0, visited);
test<Context, int, ExpectedResultType, int>(std::numeric_limits<signed char>::max(), visited);
test<Context, int, ExpectedResultType, int>(std::numeric_limits<short>::max(), visited);
test<Context, int, ExpectedResultType, int>(std::numeric_limits<int>::max(), visited);
using LongToType = std::conditional_t<sizeof(long) == sizeof(int), int, long long>;
test<Context, LongToType, ExpectedResultType, long>(std::numeric_limits<long>::min(), visited);
test<Context, LongToType, ExpectedResultType, long>(std::numeric_limits<int>::min(), visited);
test<Context, LongToType, ExpectedResultType, long>(std::numeric_limits<short>::min(), visited);
test<Context, LongToType, ExpectedResultType, long>(std::numeric_limits<signed char>::min(), visited);
test<Context, LongToType, ExpectedResultType, long>(0, visited);
test<Context, LongToType, ExpectedResultType, long>(std::numeric_limits<signed char>::max(), visited);
test<Context, LongToType, ExpectedResultType, long>(std::numeric_limits<short>::max(), visited);
test<Context, LongToType, ExpectedResultType, long>(std::numeric_limits<int>::max(), visited);
test<Context, LongToType, ExpectedResultType, long>(std::numeric_limits<long>::max(), visited);
test<Context, long long, ExpectedResultType, long long>(std::numeric_limits<long long>::min(), visited);
test<Context, long long, ExpectedResultType, long long>(std::numeric_limits<long>::min(), visited);
test<Context, long long, ExpectedResultType, long long>(std::numeric_limits<int>::min(), visited);
test<Context, long long, ExpectedResultType, long long>(std::numeric_limits<short>::min(), visited);
test<Context, long long, ExpectedResultType, long long>(std::numeric_limits<signed char>::min(), visited);
test<Context, long long, ExpectedResultType, long long>(0, visited);
test<Context, long long, ExpectedResultType, long long>(std::numeric_limits<signed char>::max(), visited);
test<Context, long long, ExpectedResultType, long long>(std::numeric_limits<short>::max(), visited);
test<Context, long long, ExpectedResultType, long long>(std::numeric_limits<int>::max(), visited);
test<Context, long long, ExpectedResultType, long long>(std::numeric_limits<long>::max(), visited);
test<Context, long long, ExpectedResultType, long long>(std::numeric_limits<long long>::max(), visited);
#ifndef TEST_HAS_NO_INT128
test_handle<Context, __int128_t, ExpectedResultType>(0, visited);
#endif // TEST_HAS_NO_INT128
// Test unsigned integer types.
test<Context, unsigned, ExpectedResultType, unsigned char>(0, visited);
test<Context, unsigned, ExpectedResultType, unsigned char>(std::numeric_limits<unsigned char>::max(), visited);
test<Context, unsigned, ExpectedResultType, unsigned short>(0, visited);
test<Context, unsigned, ExpectedResultType, unsigned short>(std::numeric_limits<unsigned char>::max(), visited);
test<Context, unsigned, ExpectedResultType, unsigned short>(std::numeric_limits<unsigned short>::max(), visited);
test<Context, unsigned, ExpectedResultType, unsigned>(0, visited);
test<Context, unsigned, ExpectedResultType, unsigned>(std::numeric_limits<unsigned char>::max(), visited);
test<Context, unsigned, ExpectedResultType, unsigned>(std::numeric_limits<unsigned short>::max(), visited);
test<Context, unsigned, ExpectedResultType, unsigned>(std::numeric_limits<unsigned>::max(), visited);
using UnsignedLongToType =
std::conditional_t<sizeof(unsigned long) == sizeof(unsigned), unsigned, unsigned long long>;
test<Context, UnsignedLongToType, ExpectedResultType, unsigned long>(0, visited);
test<Context, UnsignedLongToType, ExpectedResultType, unsigned long>(
std::numeric_limits<unsigned char>::max(), visited);
test<Context, UnsignedLongToType, ExpectedResultType, unsigned long>(
std::numeric_limits<unsigned short>::max(), visited);
test<Context, UnsignedLongToType, ExpectedResultType, unsigned long>(std::numeric_limits<unsigned>::max(), visited);
test<Context, UnsignedLongToType, ExpectedResultType, unsigned long>(
std::numeric_limits<unsigned long>::max(), visited);
test<Context, unsigned long long, ExpectedResultType, unsigned long long>(0, visited);
test<Context, unsigned long long, ExpectedResultType, unsigned long long>(
std::numeric_limits<unsigned char>::max(), visited);
test<Context, unsigned long long, ExpectedResultType, unsigned long long>(
std::numeric_limits<unsigned short>::max(), visited);
test<Context, unsigned long long, ExpectedResultType, unsigned long long>(
std::numeric_limits<unsigned>::max(), visited);
test<Context, unsigned long long, ExpectedResultType, unsigned long long>(
std::numeric_limits<unsigned long>::max(), visited);
test<Context, unsigned long long, ExpectedResultType, unsigned long long>(
std::numeric_limits<unsigned long long>::max(), visited);
#ifndef TEST_HAS_NO_INT128
test_handle<Context, __uint128_t, ExpectedResultType>(0, visited);
#endif // TEST_HAS_NO_INT128
// Test floating point types.
test<Context, float, ExpectedResultType, float>(-std::numeric_limits<float>::max(), visited);
test<Context, float, ExpectedResultType, float>(-std::numeric_limits<float>::min(), visited);
test<Context, float, ExpectedResultType, float>(-0.0, visited);
test<Context, float, ExpectedResultType, float>(0.0, visited);
test<Context, float, ExpectedResultType, float>(std::numeric_limits<float>::min(), visited);
test<Context, float, ExpectedResultType, float>(std::numeric_limits<float>::max(), visited);
test<Context, double, ExpectedResultType, double>(-std::numeric_limits<double>::max(), visited);
test<Context, double, ExpectedResultType, double>(-std::numeric_limits<double>::min(), visited);
test<Context, double, ExpectedResultType, double>(-0.0, visited);
test<Context, double, ExpectedResultType, double>(0.0, visited);
test<Context, double, ExpectedResultType, double>(std::numeric_limits<double>::min(), visited);
test<Context, double, ExpectedResultType, double>(std::numeric_limits<double>::max(), visited);
test<Context, long double, ExpectedResultType, long double>(-std::numeric_limits<long double>::max(), visited);
test<Context, long double, ExpectedResultType, long double>(-std::numeric_limits<long double>::min(), visited);
test<Context, long double, ExpectedResultType, long double>(-0.0, visited);
test<Context, long double, ExpectedResultType, long double>(0.0, visited);
test<Context, long double, ExpectedResultType, long double>(std::numeric_limits<long double>::min(), visited);
test<Context, long double, ExpectedResultType, long double>(std::numeric_limits<long double>::max(), visited);
// Test const CharT pointer types.
test<Context, const CharT*, ExpectedResultType, const CharT*>(empty.c_str(), visited);
test<Context, const CharT*, ExpectedResultType, const CharT*>(str.c_str(), visited);
// Test string_view types.
{
using From = std::basic_string_view<CharT>;
test_string_view<Context, ExpectedResultType>(From(), visited);
test_string_view<Context, ExpectedResultType>(From(empty.c_str()), visited);
test_string_view<Context, ExpectedResultType>(From(str.c_str()), visited);
}
{
using From = std::basic_string_view<CharT, constexpr_char_traits<CharT>>;
test_string_view<Context, ExpectedResultType>(From(), visited);
test_string_view<Context, ExpectedResultType>(From(empty.c_str()), visited);
test_string_view<Context, ExpectedResultType>(From(str.c_str()), visited);
}
// Test string types.
{
using From = std::basic_string<CharT>;
test_string_view<Context, ExpectedResultType>(From(), visited);
test_string_view<Context, ExpectedResultType>(From(empty.c_str()), visited);
test_string_view<Context, ExpectedResultType>(From(str.c_str()), visited);
}
{
using From = std::basic_string<CharT, constexpr_char_traits<CharT>, std::allocator<CharT>>;
test_string_view<Context, ExpectedResultType>(From(), visited);
test_string_view<Context, ExpectedResultType>(From(empty.c_str()), visited);
test_string_view<Context, ExpectedResultType>(From(str.c_str()), visited);
}
{
using From = std::basic_string<CharT, std::char_traits<CharT>, min_allocator<CharT>>;
test_string_view<Context, ExpectedResultType>(From(), visited);
test_string_view<Context, ExpectedResultType>(From(empty.c_str()), visited);
test_string_view<Context, ExpectedResultType>(From(str.c_str()), visited);
}
{
using From = std::basic_string<CharT, constexpr_char_traits<CharT>, min_allocator<CharT>>;
test_string_view<Context, ExpectedResultType>(From(), visited);
test_string_view<Context, ExpectedResultType>(From(empty.c_str()), visited);
test_string_view<Context, ExpectedResultType>(From(str.c_str()), visited);
}
// Test pointer types.
test<Context, const void*, ExpectedResultType>(nullptr, visited);
int i = 0;
test<Context, const void*, ExpectedResultType>(static_cast<void*>(&i), visited);
const int ci = 0;
test<Context, const void*, ExpectedResultType>(static_cast<const void*>(&ci), visited);
}
int main(int, char**) {
test<char>();
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test<wchar_t>();
#endif
return 0;
}
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