[diff.library] Entry for `abs` incompatibility

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
68/100
Issue type
Documentation
Clarity
Mostly clear
Activity status
Quiet
Tech stack
cpp
Domain
documentation

Research direction

Start at the diff.library entry for abs and compare the C and C++ behavior described in the issue, including abs(LLONG_MIN). Update the entry so this incompatibility is recorded accurately; done means the relevant C/C++ distinction is clearly documented.

Written by the indexing model from the issue text.

Description

P2-Bug

The following code has undefined behavior in C++, but is well-defined in C:

abs(LLONG_MIN);

This happens because in C++, abs is overloaded and dispatches to llabs,
whereas in C, LLONG_MIN yields zero when converted to int when calling int abs(int).

Dominant language
TeX
Stars
221
Forks
813
Avg merge
16h 4m
Merged PRs (30d)
36

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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