Feature gate:#![feature(int_format_into)]

This is a tracking issue for efficient decimal integer formatting into a fixed-size buffer.

Public API

// core::numstructNumBuffer{ ..}implNumBuffer{fnnew() ->Self;}impl $Int{fnformat_into(self,&mutNumBuffer) ->&str;}

Steps / History

• ACP:Efficient integer formatting into fixed-size buffer libs-team#546
• Implementation:Implementint_format_into feature #142098
• Final comment period (FCP)¹
• Stabilization PR:Stabilizeint_format_into feature #152544

Unresolved Questions

• Should this return&[ascii::Char] in the future?Efficient integer formatting into fixed-size buffer libs-team#546 (comment)
• ShouldNumBuffer beNumBuffer<$Int> so that the reserved space can be tailored to the specific integer's size? Not a big difference with current integer types, but may be significant if we gainu8192 in the future.
• Naming ofcore::num::NumBuffer.