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fix format a long value with formatter #2768

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Merged
StephanTLavavej merged 9 commits into from
Jun 12, 2022
Merged

fix format a long value with formatter #2768

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ec54aaf
fix format with custom types
fsb4000 Jun 7, 2022
2503d2a
don't do `static_cast` if `_Storage_type` is `handle`
fsb4000 Jun 7, 2022
27721b6
Use `42L` to initialize `Box<long>`.
StephanTLavavej Jun 7, 2022
aef5eae
Test `char` and `wchar_t`.
StephanTLavavej Jun 8, 2022
2722407
Extract `_Arg_formatter`.
StephanTLavavej Jun 8, 2022
a72a280
Move test coverage to P0645R10_text_formatting_custom_formatting.
StephanTLavavej Jun 8, 2022
8caf0bd
same _Storage_type for `const string` and `string`
fsb4000 Jun 8, 2022
ba451e0
add `basic_format_arg` constructors, fix `charT*` storage type, remov…
fsb4000 Jun 9, 2022
3188b71
add one more `static_assert`
fsb4000 Jun 9, 2022
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15 changes: 10 additions & 5 deletions stl/inc/format
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Original file line number Diff line number Diff line change
Expand Up @@ -1776,7 +1776,7 @@ struct _Format_arg_traits {
-> basic_string_view<_Char_type>; // not defined

template <class _Traits, class _Alloc>
static auto _Phony_basic_format_arg_constructor(const basic_string<_Char_type, _Traits, _Alloc>&)
static auto _Phony_basic_format_arg_constructor(basic_string<_Char_type, _Traits, _Alloc>)
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-> basic_string_view<_Char_type>; // not defined

static auto _Phony_basic_format_arg_constructor(nullptr_t) -> const void*; // not defined
Expand Down Expand Up @@ -3286,10 +3286,15 @@ struct _Formatter_base {
_FormatCtx.arg(static_cast<size_t>(_Specs._Dynamic_precision_index)));
}

return _STD visit_format_arg(
_Arg_formatter<typename _FormatContext::iterator, _CharT>{
._Ctx = _STD addressof(_FormatCtx), ._Specs = _STD addressof(_Format_specs)},
basic_format_arg<_FormatContext>{_Val});
_Arg_formatter<typename _FormatContext::iterator, _CharT> _Arg_fmt{
._Ctx = _STD addressof(_FormatCtx), ._Specs = _STD addressof(_Format_specs)};

using _Storage_type = typename _Format_arg_traits<_FormatContext>::template _Storage_type<_Ty>;
if constexpr (is_same_v<typename basic_format_arg<_FormatContext>::handle, _Storage_type>) {
return _STD visit_format_arg(_Arg_fmt, basic_format_arg<_FormatContext>{_Val});
} else {
return _STD visit_format_arg(_Arg_fmt, basic_format_arg<_FormatContext>{static_cast<_Storage_type>(_Val)});
}
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}

private:
Expand Down
4 changes: 4 additions & 0 deletions tests/std/tests/P0645R10_text_formatting_args/test.cpp
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Expand Up @@ -7,6 +7,7 @@
#include <cstdint>
#include <format>
#include <memory>
#include <string>
#include <string_view>
#include <type_traits>
#include <variant>
Expand Down Expand Up @@ -212,6 +213,9 @@ void test_format_arg_store() {
static_assert(sizeof(_Format_arg_index) == sizeof(size_t));
static_assert(is_same_v<_Format_arg_traits<format_context>::_Storage_type<void*>, const void*>);

static_assert(is_same_v<_Format_arg_traits<format_context>::_Storage_type<string>, string_view>);
static_assert(is_same_v<_Format_arg_traits<format_context>::_Storage_type<const string>, string_view>);

template <class Context>
void test_visit_monostate() {
assert(visit_format_arg(visitor<Context>, basic_format_arg<Context>()) == Arg_type::none);
Expand Down
6 changes: 6 additions & 0 deletions tests/std/tests/P0645R10_text_formatting_custom_formatting/test.cpp
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Expand Up @@ -172,29 +172,35 @@ void test_format_family_overloads() {
template <class charT>
void test_custom_formattable_type() {
test_numeric_custom_formattable_type<int, charT>();
test_numeric_custom_formattable_type<long, charT>();
test_numeric_custom_formattable_type<long long, charT>();
test_numeric_custom_formattable_type<unsigned int, charT>();
test_numeric_custom_formattable_type<unsigned long, charT>();
test_numeric_custom_formattable_type<unsigned long long, charT>();
test_numeric_custom_formattable_type<short, charT>();
#ifdef _NATIVE_WCHAR_T_DEFINED
test_numeric_custom_formattable_type<unsigned short, charT>();
#endif
test_numeric_custom_formattable_type<float, charT>();
test_numeric_custom_formattable_type<double, charT>();
test_numeric_custom_formattable_type<long double, charT>();
}

template <class charT>
void test_mixed_custom_formattable_type() {
test_numeric_mixed_args_custom_formattable_type<int, charT>();
test_numeric_mixed_args_custom_formattable_type<long, charT>();
test_numeric_mixed_args_custom_formattable_type<long long, charT>();
test_numeric_mixed_args_custom_formattable_type<unsigned int, charT>();
test_numeric_mixed_args_custom_formattable_type<unsigned long, charT>();
test_numeric_mixed_args_custom_formattable_type<unsigned long long, charT>();
test_numeric_mixed_args_custom_formattable_type<short, charT>();
#ifdef _NATIVE_WCHAR_T_DEFINED
test_numeric_mixed_args_custom_formattable_type<unsigned short, charT>();
#endif
test_numeric_mixed_args_custom_formattable_type<float, charT>();
test_numeric_mixed_args_custom_formattable_type<double, charT>();
test_numeric_mixed_args_custom_formattable_type<long double, charT>();
}

int main() {
Expand Down