boostorg/spirit_x4

Invalid real numbers should be rejected by real parsers

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#63 opened on Oct 5, 2025

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buggood first issuehelp wantedtests needed

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Description

For example:

  • 9.9e999999999999999999999 should be rejected
  • ... need further investigation ...

Integer parsers currently seem to correctly reject some invalid values, for instance too big numbers. I have no idea why the implementation detail has divergence between integer and real parsers.

Contributor guide

Research direction
Investigate the real number parser implementation and compare it with the integer parser to identify why invalid numbers like '9.9e999999999999999999999' are not rejected.
Tech stack
cpp
Domain
compilers
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
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.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Needs investigation
Prerequisites
C++Git
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60