swiftlang/swift

[SR-7136] Fast-path ad-hoc printing of Strings

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#49,684 opened on Mar 7, 2018

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buggood first issuestandard library

Description
Previous ID SR-7136
Radar None
Original Reporter @jckarter
Type Bug

Attachment: Download
Votes 0
Component/s Standard Library
Labels Bug, StarterBug
Assignee None
Priority Medium

md5: 2686733126be82154b524085fb9de797

Issue Description:

Using Strings with print, string interpolation, String(describing:), etc., is extremely common, but goes through the generic protocol testing dispatch mechanism everything does. We should dynamically check whether something is a String and just print the string.

Contributor guide

Tech stack
swift
Domain
performance
Issue type
performance
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Swift programming languageUnderstanding of genericsFamiliarity with string interpolation
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70
Research direction
The issue proposes adding a dynamic type check for String in the generic printing dispatch. Investigate the current implementation in the Swift standard library, likely in the 'Print.swift' file. Look for the function that handles conversion to String and consider adding a fast path that directly prints the string without going through generics. Review comments on the issue for any prior discussion or attempted approaches.