fmtlib/fmt

Formatting std::exception_ptr:s

Closed

#4,808 opened on Jun 15, 2026

View on GitHubContributor guide
 (3 comments) (0 reactions) (0 assignees)C++ (2,881 forks)batch import
help wanted

Repository metrics

Stars
 (23,489 stars)
PR merge metrics
 (Avg merge 2d 9h) (12 merged PRs in 30d)

Description

It would be nice if the library (and the Standard) supported formatting std::exception_ptr:s as part of fmt/std.h or <format>. Of course, anyone can implement a formatter, but if third-party libraries do this, they will eventually clash.

Contributor guide

Research direction
Examine existing formatters in fmt/std.h and understand how to specialize fmt::formatter for std::exception ptr. Consider how to extract the exception message and handle polymorphic types.
Tech stack
cpp
Domain
tooling
Issue type
Feature
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.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C++fmt library basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60