Enable inheriting from formatter<std::string_view> #4055
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Arghnews
force-pushed
the
fmt_std_string_view_conversions
branch
from
fd8e243 to
a0d85e6
Compare
vitaut
reviewed
Jul 11, 2024
include/fmt/format.h
Outdated
Comment on lines
3999
to
4008
| // Fixes issue #4036 | ||
| template <typename Char> | ||
| struct formatter<detail::std_string_view<Char>, Char> | ||
| : public formatter<basic_string_view<Char>, Char> { | ||
| auto format(const detail::std_string_view<Char>& value, | ||
| format_context& ctx) const -> decltype(ctx.out()) { | ||
| using base = formatter<basic_string_view<Char>, Char>; | ||
| return base::format(value, ctx); | ||
| } | ||
| }; |
There was a problem hiding this comment.
Looks like I forgot to actually comment what the requested change was =). Let's apply the change to FMT_FORMAT_AS rather than just the formatter specialization for string_view.
There was a problem hiding this comment.
No problem, have updated review (haven't squashed yet so you can see diffs), with what I believe you're saying. Just check the types of the params and this is what you meant etc.
Arghnews
force-pushed
the
fmt_std_string_view_conversions
branch
from
a0d85e6 to
0b932de
Compare
Arghnews
commented
Jul 13, 2024
include/fmt/format.h
Outdated
| template <typename Char> \ | ||
| struct formatter<Type, Char> : formatter<Base, Char> { \ | ||
| template <typename FormatContext> \ | ||
| auto format(Type value, FormatContext&& ctx) const \ |
There was a problem hiding this comment.
We either have to pass Type as a value like here, or turn this parameter into a forwarding reference too otherwise we get const errors. I opted for a value as the types for this are all small (<=16bytes)
Ditto on const issues with passing const format_context& or format_context& so have used a forwarding ref for that too (if there's a better way for this one let me know)
There was a problem hiding this comment.
FormatContext should always be passed by a normal reference (&).
Allows (for example) types convertible to std::string_view to inherit from the fmt::formatter<fmt::string_view> to work etc.
Arghnews
force-pushed
the
fmt_std_string_view_conversions
branch
from
0980555 to
0c06809
Compare
vitaut
approved these changes
Jul 13, 2024
|
Merged, thanks! |
mtremer
pushed a commit
to ipfire/ipfire-2.x
that referenced
this pull request
Aug 15, 2024
- Update from version 11.0.1 to 11.0.2
- Update of rootfile
- Changelog
11.0.2
- Fixed compatibility with non-POSIX systems
(fmtlib/fmt#4054,
fmtlib/fmt#4060).
- Fixed performance regressions when using `std::back_insert_iterator` with
`fmt::format_to` (fmtlib/fmt#4070).
- Fixed handling of `std::generator` and move-only iterators
(fmtlib/fmt#4053,
fmtlib/fmt#4057). Thanks @Arghnews.
- Made `formatter<std::string_view>::parse` work with types convertible to
`std::string_view` (fmtlib/fmt#4036,
fmtlib/fmt#4055). Thanks @Arghnews.
- Made `volatile void*` formattable
(fmtlib/fmt#4049,
fmtlib/fmt#4056). Thanks @Arghnews.
- Made `Glib::ustring` not be confused with `std::string`
(fmtlib/fmt#4052).
- Made `fmt::context` iterator compatible with STL algorithms that rely on
iterator category (fmtlib/fmt#4079).
Signed-off-by: Adolf Belka <[email protected]>
Signed-off-by: Michael Tremer <[email protected]>
mtremer
pushed a commit
to ipfire/ipfire-2.x
that referenced
this pull request
Feb 22, 2025
- Update from version 11.0.2 to 11.1.3
- Update of rootfile
- Changelog
11.1.3
- Fixed compilation on GCC 9.4 (fmtlib/fmt#4313).
- Worked around an internal compiler error when using C++20 modules with GCC
14.2 and earlier (fmtlib/fmt#4295).
- Worked around a bug in GCC 6 (fmtlib/fmt#4318).
- Fixed an issue caused by instantiating `formatter<const T>`
(fmtlib/fmt#4303,
fmtlib/fmt#4325). Thanks @timsong-cpp.
- Fixed formatting into `std::ostreambuf_iterator` when using format string
compilation (fmtlib/fmt#4309,
fmtlib/fmt#4312). Thanks @phprus.
- Restored a constraint on the map formatter so that it correctly reports as
unformattable when the element is (fmtlib/fmt#4326).
Thanks @timsong-cpp.
- Reduced the size of format specs (fmtlib/fmt#4298).
- Readded `args()` to `fmt::format_context`
(fmtlib/fmt#4307,
fmtlib/fmt#4310). Thanks @Erroneous1.
- Fixed a bogus MSVC warning (fmtlib/fmt#4314,
fmtlib/fmt#4322). Thanks @ZehMatt.
- Fixed a pedantic mode error in the CMake config
(fmtlib/fmt#4327). Thanks @rlalik.
11.1.2
- Fixed ABI compatibility with earlier 11.x versions
(fmtlib/fmt#4292).
- Added `wchar_t` support to the `std::bitset` formatter
(fmtlib/fmt#4285,
fmtlib/fmt#4286,
fmtlib/fmt#4289,
fmtlib/fmt#4290). Thanks @phprus.
- Prefixed CMake components with `fmt-` to simplify usage of {fmt} via
`add_subdirectory` (fmtlib/fmt#4283).
- Updated docs for meson (fmtlib/fmt#4291).
Thanks @trim21.
- Fixed a compilation error in chrono on nvcc
(fmtlib/fmt#4297,
fmtlib/fmt#4301). Thanks @breyerml.
- Fixed various warnings
(fmtlib/fmt#4288,
fmtlib/fmt#4299). Thanks @GamesTrap and @edo9300.
11.1.1
- Fixed ABI compatibility with earlier 11.x versions
(fmtlib/fmt#4278).
- Defined CMake components (`core` and `doc`) to allow docs to be installed
separately (fmtlib/fmt#4276).
Thanks @carlsmedstad.
11.1.0
- Improved C++20 module support
(fmtlib/fmt#4081,
fmtlib/fmt#4083,
fmtlib/fmt#4084,
fmtlib/fmt#4152,
fmtlib/fmt#4153,
fmtlib/fmt#4169,
fmtlib/fmt#4190,
fmtlib/fmt#4234,
fmtlib/fmt#4239).
Thanks @kamrann and @Arghnews.
- Reduced debug (unoptimized) binary code size and the number of template
instantiations when passing formatting arguments. For example, unoptimized
binary code size for `fmt::print("{}", 42)` was reduced by ~40% on GCC and
~60% on clang (x86-64).
GCC:
- Before: 161 instructions of which 105 are in reusable functions
([godbolt](https://www.godbolt.org/z/s9bGoo4ze)).
- After: 116 instructions of which 60 are in reusable functions
([godbolt](https://www.godbolt.org/z/r7GGGxMs6)).
Clang:
- Before: 310 instructions of which 251 are in reusable functions
([godbolt](https://www.godbolt.org/z/Ts88b7M9o)).
- After: 194 instructions of which 135 are in reusable functions
([godbolt](https://www.godbolt.org/z/vcrjP8ceW)).
- Added an experimental `fmt::writer` API that can be used for writing to
different destinations such as files or strings
(fmtlib/fmt#2354).
For example ([godbolt](https://www.godbolt.org/z/rWoKfbP7e)):
```c++
#include <fmt/os.h>
void write_text(fmt::writer w) {
w.print("The answer is {}.", 42);
}
int main() {
// Write to FILE.
write_text(stdout);
// Write to fmt::ostream.
auto f = fmt::output_file("myfile");
write_text(f);
// Write to std::string.
auto sb = fmt::string_buffer();
write_text(sb);
std::string s = sb.str();
}
```
- Added width and alignment support to the formatter of `std::error_code`.
- Made `std::expected<void, E>` formattable
(fmtlib/fmt#4145,
fmtlib/fmt#4148).
For example ([godbolt](https://www.godbolt.org/z/hrj5c6G86)):
```c++
fmt::print("{}", std::expected<void, int>());
```
prints
```
expected()
```
Thanks @phprus.
- Made `fmt::is_formattable<void>` SFINAE-friendly
(fmtlib/fmt#4147).
- Added support for `_BitInt` formatting when using clang
(fmtlib/fmt#4007,
fmtlib/fmt#4072,
fmtlib/fmt#4140,
fmtlib/fmt#4173,
fmtlib/fmt#4176).
For example ([godbolt](https://www.godbolt.org/z/KWjbWec5z)):
```c++
using int42 = _BitInt(42);
fmt::print("{}", int42(100));
```
Thanks @Arghnews.
- Added the `n` specifier for tuples and pairs
(fmtlib/fmt#4107). Thanks @someonewithpc.
- Added support for tuple-like types to `fmt::join`
(fmtlib/fmt#4226,
fmtlib/fmt#4230). Thanks @phprus.
- Made more types formattable at compile time
(fmtlib/fmt#4127). Thanks @AnthonyVH.
- Implemented a more efficient compile-time `fmt::formatted_size`
(fmtlib/fmt#4102,
fmtlib/fmt#4103). Thanks @phprus.
- Fixed compile-time formatting of some string types
(fmtlib/fmt#4065). Thanks @torshepherd.
- Made compiled version of `fmt::format_to` work with
`std::back_insert_iterator<std::vector<char>>`
(fmtlib/fmt#4206,
fmtlib/fmt#4211). Thanks @phprus.
- Added a formatter for `std::reference_wrapper`
(fmtlib/fmt#4163,
fmtlib/fmt#4164). Thanks @yfeldblum and @phprus.
- Added experimental padding support (glibc `strftime` extension) to `%m`, `%j`
and `%Y` (fmtlib/fmt#4161). Thanks @KKhanhH.
- Made microseconds formatted as `us` instead of `µs` if the Unicode support is
disabled (fmtlib/fmt#4088).
- Fixed an unreleased regression in transcoding of surrogate pairs
(fmtlib/fmt#4094,
fmtlib/fmt#4095). Thanks @phprus.
- Made `fmt::appender` satisfy `std::output_iterator` concept
(fmtlib/fmt#4092,
fmtlib/fmt#4093). Thanks @phprus.
- Made `std::iterator_traits<fmt::appender>` standard-conforming
(fmtlib/fmt#4185). Thanks @CaseyCarter.
- Made it easier to reuse `fmt::formatter<std::string_view>` for types with
an implicit conversion to `std::string_view`
(fmtlib/fmt#4036,
fmtlib/fmt#4055). Thanks @Arghnews.
- Made it possible to disable `<filesystem>` use via `FMT_CPP_LIB_FILESYSTEM`
for compatibility with some video game console SDKs, e.g. Nintendo Switch SDK
(fmtlib/fmt#4257,
fmtlib/fmt#4258,
fmtlib/fmt#4259). Thanks @W4RH4WK and @phprus.
- Fixed compatibility with platforms that use 80-bit `long double`
(fmtlib/fmt#4245,
fmtlib/fmt#4246). Thanks @jsirpoma.
- Added support for UTF-32 code units greater than `0xFFFF` in fill
(fmtlib/fmt#4201).
- Fixed handling of legacy encodings on Windows with GCC
(fmtlib/fmt#4162).
- Made `fmt::to_string` take `fmt::basic_memory_buffer` by const reference
(fmtlib/fmt#4261,
fmtlib/fmt#4262). Thanks @sascha-devel.
- Added `fmt::dynamic_format_arg_store::size`
(fmtlib/fmt#4270). Thanks @hannes-harnisch.
- Removed the ability to control locale usage via an undocumented
`FMT_STATIC_THOUSANDS_SEPARATOR` in favor of `FMT_USE_LOCALE`.
- Renamed `FMT_EXCEPTIONS` to `FMT_USE_EXCEPTIONS` for consistency with other
similar macros.
- Improved include directory ordering to reduce the chance of including
incorrect headers when using multiple versions of {fmt}
(fmtlib/fmt#4116). Thanks @cdzhan.
- Made it possible to compile a subset of {fmt} without the C++ runtime.
- Improved documentation and README
(fmtlib/fmt#4066,
fmtlib/fmt#4117,
fmtlib/fmt#4203,
fmtlib/fmt#4235). Thanks @zyctree and @nikola-sh.
- Improved the documentation generator (fmtlib/fmt#4110,
fmtlib/fmt#4115). Thanks @rturrado.
- Improved CI (fmtlib/fmt#4155,
fmtlib/fmt#4151). Thanks @phprus.
- Fixed various warnings and compilation issues
(fmtlib/fmt#2708,
fmtlib/fmt#4091,
fmtlib/fmt#4109,
fmtlib/fmt#4113,
fmtlib/fmt#4125,
fmtlib/fmt#4129,
fmtlib/fmt#4130,
fmtlib/fmt#4131,
fmtlib/fmt#4132,
fmtlib/fmt#4133,
fmtlib/fmt#4144,
fmtlib/fmt#4150,
fmtlib/fmt#4158,
fmtlib/fmt#4159,
fmtlib/fmt#4160,
fmtlib/fmt#4170,
fmtlib/fmt#4177,
fmtlib/fmt#4187,
fmtlib/fmt#4188,
fmtlib/fmt#4194,
fmtlib/fmt#4200,
fmtlib/fmt#4205,
fmtlib/fmt#4207,
fmtlib/fmt#4208,
fmtlib/fmt#4210,
fmtlib/fmt#4220,
fmtlib/fmt#4231,
fmtlib/fmt#4232,
fmtlib/fmt#4233,
fmtlib/fmt#4236,
fmtlib/fmt#4267,
fmtlib/fmt#4271).
Thanks @torsten48, @Arghnews, @tinfoilboy, @aminya, @Ottani, @zeroomega,
@c4v4, @kongy, @vinayyadav3016, @sergio-nsk, @phprus and @YexuanXiao.
Signed-off-by: Adolf Belka <[email protected]>
Signed-off-by: Michael Tremer <[email protected]>
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Fixes #4036
This formatter specialization with
base::formatmeans a class implicitly convertible tostd::string_viewwill now be converted by this format function before being passed to thefmt::string_viewformat function.This wouldn't work previously as the compiler may only perform one implicit conversion, and we need 2 here (from our type, to
std::string_view, tofmt::string_view).