This implements the generic std.format.spec framework for all types.
The Unicode support will be added in a separate patch.
Implements parts of:
- P0645 Text Formatting
Completes:
- LWG-3242 std::format: missing rules for arg-id in width and precision
- P1892 Extended locale-specific presentation specifiers for std::format
Reviewed By: #libc, ldionne, vitaut
Differential Revision: https://reviews.llvm.org/D103368
This implements the initial version of the `std::formatter` class and its specializations. It also implements the following formatting functions:
- `format`
- `vformat`
- `format_to`
- `vformat_to`
- `format_to_n`
- `formatted_size`
All functions have a `char` and `wchar_t` version. Parsing the format-spec and
using the parsed format-spec hasn't been implemented. The code isn't optimized,
neither for speed, nor for size.
The goal is to have the rudimentary basics working, which can be used as a
basis to improve upon. The formatters used in this commit are simple stubs that
will be replaced by real formatters in later commits.
The formatters that are slated to be replaced in this patch series don't have
an availability macro to avoid merge conflicts.
Note the formatter for `bool` uses `0` and `1` instead of "false" and
"true". This will be fixed when the stub is replaced with a real
formatter.
Implements parts of:
- P0645 Text Formatting
Completes:
- LWG3539 format_to must not copy models of output_iterator<const charT&>
Reviewed By: ldionne, #libc, vitaut
Differential Revision: https://reviews.llvm.org/D96664
This implements the struct `__format_arg_store` and its dependencies:
* the class basic_format_arg,
* the class basic_format_args,
* the class basic_format_context,
* the function make_format_args,
* the function wmake_format_args,
* the function visit_format_arg,
* several Standard required typedefs.
The following parts will be implemented in a later patch:
* the child class `basic_format_arg::handle`,
* the function `basic_format_arg::basic_format_arg(const T* p)`.
The following extension has been implemented:
* the class basic_format_arg supports `__[u]int128_t` on platform where libc++ supports 128 bit integrals.
Implements parts of:
* P0645 Text Formatting
Completes:
* LWG3371 visit_format_arg and make_format_args are not hidden friends
* LWG3542 basic_format_arg mishandles basic_string_view with custom traits
Note https://mordante.github.io/blog/2021/06/05/format.html gives a bit more information about the goals and non-goals of this initial patch series.
Reviewed By: #libc, ldionne, vitaut
Differential Revision: https://reviews.llvm.org/D103357
@tcanens pointed out the current behavior of the macro breaks the usage
pattern described in http://wg21.link/SD6
```
# if __has_include(<optional>)
# include <optional>
# if __cpp_lib_optional >= 201606
# define have_optional 1
# endif
```
To support this usage pattern the hard errror is removed. Instead the
header includes nothing but the `<version>` header.
Reviewed By: ldionne, #libc
Differential Revision: https://reviews.llvm.org/D107134
Adds a new CMake option to disable the usage of incomplete headers.
These incomplete headers are not guaranteed to be ABI stable. This
option is intended to be used by vendors so they can avoid their users
from code that's not ready for production usage.
The option is enabled by default.
Differential Revision: https://reviews.llvm.org/D106763
This is a preparation to split the format header in smaller parts for the
upcoming patches.
Depends on D101723
Reviewed By: #libc, ldionne
Differential Revision: https://reviews.llvm.org/D102703
It seems like modifying the header doesn't cause libc++ to be rebuild.
So the breakage of the previous commit didn't happen on my system.
This should fix the build of https://buildkite.com/mlir/mlir-core
Implements parts of:
- P0645 Text Formatting
Depends on D92214
Reland with changes:
The format header will only be compiled if the compiler used has support
for concepts. This should fix the issues with the initial version.
Differential Revision: https://reviews.llvm.org/D93166
This reverts commit 35a57f39b5.
A build is broken during clang bootstrap with:
In file included from ../libcxx/src/format.cpp:9:
/tmp/ci-nGNyLRM9V3/include/c++/v1/format:153:16: error: no member named 'is_constant_evaluated' in namespace 'std::__1'
if (_VSTD::is_constant_evaluated() && __id >= __num_args_)
~~~~~~~^
1 error generated.
This is the first step at implementing <format>. It adds the <format> header
and implements the `format_error`. class.
Implemnts parts of:
-P0645 Text Formatting
Reviewed By: ldionne, #libc, miscco, curdeius
Differential Revision: https://reviews.llvm.org/D92214
Mark de Wever