libc++ Format Status

Overview

This document contains the status of the 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	Status	First released version
P1361 P2372	Formatting chrono
[time.syn]	Formatter chrono::duration<Rep, Period>		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::sys_time<Duration>		Mark de Wever	Complete	17.0
[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>		Mark de Wever	Complete	17.0
[time.syn]	Formatter chrono::local_time<Duration>		Mark de Wever	Complete	17.0
[time.syn]	Formatter chrono::local-time-format-t<Duration>	A <chrono> implementation	Not assigned
[time.syn]	Formatter chrono::day		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::month		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::year		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::weekday		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::weekday_indexed		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::weekday_last		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::month_day		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::month_day_last		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::month_weekday		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::month_weekday_last		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::year_month		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::year_month_day		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::year_month_day_last		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::year_month_weekday		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::year_month_weekday_last		Mark de Wever	Complete	16.0
[time.syn]	Formatter chrono::hh_mm_ss<duration<Rep, Period>>		Mark de Wever	Complete	17.0
[time.syn]	Formatter chrono::sys_info	A <chrono> implementation	Mark de Wever
[time.syn]	Formatter chrono::local_info	A <chrono> implementation	Mark de Wever
[time.syn]	Formatter chrono::zoned_time<Duration, TimeZonePtr>	A <chrono> implementation	Mark de Wever
P2286R8	Formatting ranges
[format.syn]	Concept formattable		Mark de Wever	Complete	16.0
[format.string.std]	std-format-spec type debug		Mark de Wever	Complete	16.0
[format.range]	Formatting for ranges: sequences		Mark de Wever	Complete	16.0
[format.range.fmtmap]	Formatting for ranges: map		Mark de Wever	Complete	16.0
[format.range.fmtset]	Formatting for ranges: set		Mark de Wever	Complete	16.0
[format.range]	Formatting for ranges: container adaptors		Mark de Wever	Complete	16.0
[format.range]	Formatting for ranges: pair and tuple		Mark de Wever	Complete	16.0
[format.range]	Formatting for ranges: vector<bool>		Mark de Wever	Complete	16.0
P2585R0	Improving default container formatting
[format.range.fmtstr]	Formatting for ranges: strings		Mark de Wever	Complete	17.0
[format.range.fmtstr]	Formatting for ranges: debug_strings		Mark de Wever	Complete	17.0
P2693R1	Formatting thread::id and stacktrace
[thread.thread.id]	Formatting thread::id		Mark de Wever	Complete	17.0
[stacktrace.format]	Formatting stacktrace	A <stacktrace> implementation	Mark de Wever
P2093R14	Formatted output
[print.fun]	Output to stdout		Mark de Wever	Complete	17.0
[print.fun]	Output to FILE*		Mark de Wever	Complete	17.0
[ostream.formatted.print]	Output to ostream		Mark de Wever

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	Standard	Assignee	Status	First released version
P0645	Text Formatting	C++20	Mark de Wever	Complete	14.0
P1652	Printf corner cases in std::format	C++20	Mark de Wever	Complete	14.0
P1892	Extended locale-specific presentation specifiers for std::format	C++20	Mark de Wever	Complete	14.0
P1868	width: clarifying units of width and precision in std::format (Implements the unicode support.)	C++20	Mark de Wever	Complete	14.0
P2216	std::format improvements	C++20	Mark de Wever	Complete	15.0
P2418	Add support for std::generator-like types to std::format	C++20	Mark de Wever	Complete	15.0
P2093R14	Formatted output	C++23	Mark de Wever	In Progress
P2286R8	Formatting Ranges	C++23	Mark de Wever	Complete	16.0
P2508R1	Exposing std::basic-format-string	C++23	Mark de Wever	Complete	15.0
P2585R0	Improving default container formatting	C++23	Mark de Wever	Complete	17.0
P2539R4	Should the output of std::print to a terminal be synchronized with the underlying stream?	C++23	Mark de Wever	In Progress
P2713R1	Escaping improvements in std::format	C++23	Mark de Wever
P2675R1	format’s width estimation is too approximate and not forward compatible	C++23	Mark de Wever	Complete	17.0
P2572R1	std::format fill character allowances	C++23	Mark de Wever	Complete	17.0
P2693R1	Formatting thread::id and stacktrace	C++23	Mark de Wever	In Progress
P2510R3	Formatting pointers	C++26	Mark de Wever	Complete	17.0
P2757R3	Type-checking format args	C++26
P2637R3	Member visit	C++26
P2905R2	Runtime format strings	C++26 DR	Mark de Wever	In Progress
P2918R2	Runtime format strings II	C++26	Mark de Wever	Complete	18.0
P2909R4	Fix formatting of code units as integers (Dude, where’s my char?)	C++26 DR	Mark de Wever	Complete	18.0
P1361	Integration of chrono with text formatting	C++20	Mark de Wever	In Progress
P2372	Fixing locale handling in chrono formatters	C++20	Mark de Wever	In Progress
P2419R2	Clarify handling of encodings in localized formatting of chrono types	C++23