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
[format.functions]	Format functions - Improve performance format_to_n		Mark de Wever	D110499	Complete	Clang 15
[format.functions]	Format functions - Improve performance formatted size		Mark de Wever	D110498	Complete	Clang 15
[format.functions]	P2216 - Compile-time checks		Mark de Wever	D121530	Complete	Clang 15
[format.functions]	P2216 - Binary size		Mark de Wever	D110494	Complete	Clang 14
[time.syn]	Formatter chrono::duration<Rep, Period>		Mark de Wever		In Progress
[time.syn]	Formatter chrono::sys_time<Duration>		Mark de Wever		In Progress
[time.syn]	Formatter chrono::utc_time<Duration>	A <chrono> implementation	Not assigned
[time.syn]	Formatter chrono::tai_time<Duration>	A <chrono> implementation	Not assigned
[time.syn]	Formatter chrono::gps_time<Duration>	A <chrono> implementation	Not assigned
[time.syn]	Formatter chrono::file_time<Duration>		Not assigned
[time.syn]	Formatter chrono::local_time<Duration>		Not assigned
[time.syn]	Formatter chrono::local-time-format-t<Duration>	A <chrono> implementation	Not assigned
[time.syn]	Formatter chrono::day		Mark de Wever		In Progress
[time.syn]	Formatter chrono::month		Mark de Wever		In Progress
[time.syn]	Formatter chrono::year		Mark de Wever		In Progress
[time.syn]	Formatter chrono::weekday		Mark de Wever		In Progress
[time.syn]	Formatter chrono::weekday_indexed		Mark de Wever		In Progress
[time.syn]	Formatter chrono::weekday_last		Mark de Wever		In Progress
[time.syn]	Formatter chrono::month_day		Mark de Wever		In Progress
[time.syn]	Formatter chrono::month_day_last		Mark de Wever		In Progress
[time.syn]	Formatter chrono::month_weekday		Mark de Wever		In Progress
[time.syn]	Formatter chrono::month_weekday_last		Mark de Wever		In Progress
[time.syn]	Formatter chrono::year_month		Mark de Wever		In Progress
[time.syn]	Formatter chrono::year_month_day		Mark de Wever		In Progress
[time.syn]	Formatter chrono::year_month_day_last		Mark de Wever		In Progress
[time.syn]	Formatter chrono::year_month_weekday		Mark de Wever		In Progress
[time.syn]	Formatter chrono::year_month_weekday_last		Mark de Wever		In Progress
[time.syn]	Formatter chrono::hh_mm_ss<duration<Rep, Period>>		Mark de Wever		In Progress
[time.syn]	Formatter chrono::sys_info	A <chrono> implementation	Not assigned
[time.syn]	Formatter chrono::local_info	A <chrono> implementation	Not assigned
[time.syn]	Formatter chrono::zoned_time<Duration, TimeZonePtr>	A <chrono> implementation	Not assigned

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		Complete	Clang 15
P2418	Add support for std::generator-like types to std::format	Mark de Wever	D127570	Complete	Clang 15
P2508R1	Exposing std::basic-format-string	C++23	Mark de Wever	Complete	Clang 15
P1361	Integration of chrono with text formatting	Mark de Wever		In Progress
P2372	Fixing locale handling in chrono formatters	Mark de Wever		In Progress