libc++ Format Status

Overview

This document contains the status of the C++20 Format library in libc++. It is used to track both the status of the sub-projects of the Format library and who is assigned to these sub-projects. This is imperative to effective implementation so that work is not duplicated and implementors are not blocked by each other.

If you are interested in contributing to the libc++ Format library, please send a message to the #libcxx channel in the LLVM discord. Please do not start working on any of the assigned items below.

Sub-Projects in the Format library

Section	Description	Dependencies	Assignee	Patch	Status	First released version
[charconv.to.chars]	Fix integral conformance		Mark de Wever	D100722	Complete	Clang 13
[charconv.to.chars]	Add floating-point conversion	D100722	Mark de Wever (Code provided by Stephan T. Lavavej of Microsoft)	D70631	Complete	Clang 14
[format.error]	Class format_error		Mark de Wever	D92214	Complete	Clang 13
[format.parse.ctx]	Class template basic_format_parse_context		Mark de Wever	D93166	Complete	Clang 13
[format.context]	Class template basic_format_context		Mark de Wever	D103357	Complete	Clang 14
[format.args]	Class template basic_format_args		Mark de Wever	D103357	Complete	Clang 14
[format.arg]	Class template basic_format_arg		Mark de Wever	D103357	Complete	Clang 14
[format.arg]	Class template basic_format_arg - handle		Mark de Wever		Complete	Clang 14
[format.arg]	Class template basic_format_arg - pointers		Mark de Wever		Complete	Clang 14
[format.arg.store]	Class template format-arg-store		Mark de Wever	D103357	Complete	Clang 14
[format.formatter.spec]	Formatter specializations - character types		Mark de Wever	D96664 D103466	Complete	Clang 14
[format.formatter.spec]	Formatter specializations - string types		Mark de Wever	D96664 D103425	Complete	Clang 14
[format.formatter.spec]	Formatter specializations - boolean type		Mark de Wever	D96664 D103670	Complete	Clang 14
[format.formatter.spec]	Formatter specializations - integral types		Mark de Wever	D96664 D103433	Complete	Clang 14
[format.formatter.spec]	Formatter specializations - floating-point types	D70631	Mark de Wever	D114001	Complete	Clang 14
[format.formatter.spec]	Formatter specializations - pointer types		Mark de Wever		Complete	Clang 14
[format.string.std]	Standard format specifiers - character types		Mark de Wever	D103368	Complete	Clang 14
[format.string.std]	Standard format specifiers - string types	D103379	Mark de Wever	D103368 D103413	Complete	Clang 14
[format.string.std]	Standard format specifiers - boolean type	D103379	Mark de Wever	D103368 D103413	Complete	Clang 14
[format.string.std]	Standard format specifiers - integral types		Mark de Wever	D103368	Complete	Clang 14
[format.string.std]	Standard format specifiers - floating-point types		Mark de Wever	D114001	Complete	Clang 14
[format.string.std]	Standard format specifiers - pointer types		Mark de Wever		Complete	Clang 14
[format.functions]	Format functions - format(string_view fmt, const Args&… args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - format(wstring_view fmt, const Args&… args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - format(const locale& loc, string_view fmt, const Args&… args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - format(const locale& loc, wstring_view fmt, const Args&… args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - vformat(string_view fmt, format_args args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - vformat(wstring_view fmt, wformat_args args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - vformat(const locale& loc, string_view fmt, format_args args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - vformat(const locale& loc, wstring_view fmt, wformat_args args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - format_to(Out out, wstring_view fmt, const Args&… args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - format_to(Out out, const locale& loc, wstring_view fmt, const Args&… args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - vformat_to(Out out, string_view fmt, format_args_t<type_identity_t<Out>, char> args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - vformat_to(Out out, wstring_view fmt, format_args_t<type_identity_t<Out>, char> args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - vformat_to(Out out, const locale& loc, string_view fmt, format_args_t<type_identity_t<Out>, char> args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - vformat_to(Out out, const locale& loc, wstring_view fmt,format_args_t<type_identity_t<Out>, wchar_t> args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - format_to_n(Out out, iter_difference_t<Out> n, string_view fmt, const Args&… args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - format_to_n(Out out, iter_difference_t<Out> n, wstring_view fmt, const Args&… args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n, const locale& loc, string_view fmt, const Args&… args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n, const locale& loc, wstring_view fmt, const Args&… args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - formatted_size(string_view fmt, const Args&… args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - formatted_size(wstring_view fmt, const Args&… args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - formatted_size(const locale& loc, string_view fmt, const Args&… args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - formatted_size(const locale& loc, wstring_view fmt, const Args&… args);		Mark de Wever	D96664	Complete	Clang 14
[format.functions]	Format functions - Improve performance format_to_n		Mark de Wever	D110499	Review
[format.functions]	Format functions - Improve performance formatted size		Mark de Wever	D110500	Review
[format.functions]	P2216 - Compile-time checks		Mark de Wever		In Progress
[format.functions]	P2216 - Binary size		Mark de Wever	D110494	Complete	Clang 14

Misc. Items and TODOs

(Please mark all Format-related TODO comments with the string TODO FMT, so we can find them easily.)

Paper and Issue Status

Number	Name	Assignee	Patch	Status	First released version
P0645	Text Formatting	Mark de Wever		Complete	Clang 14
P1652	Printf corner cases in std::format	Mark de Wever	D103433, D114001	Complete	Clang 14
P1892	Extended locale-specific presentation specifiers for std::format	Mark de Wever	D103368	Complete	Clang 14
P1868	width: clarifying units of width and precision in std::format (Implements the unicode support.)	Mark de Wever	D103413 D103425 D103670	Complete	Clang 14
P2216	std::format improvements	Mark de Wever		In Progress
P2418	Add support for std::generator-like types to std::format	Mark de Wever		In Progress
P1361	Integration of chrono with text formatting			Not Started
P2372	Fixing locale handling in chrono formatters			Not Started