[diff.expr] Undocumented change of `0 == 0` type from `int` to `bool`

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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
Active
Tech stack
cpp
Domain
documentation

Research direction

Start by reading the existing wording in the [diff.iso] section and the surrounding material for [diff.expr]. Check how the draft describes equality and relational expression types, then update the documentation to cover the C versus C++ difference for 0 == 0 and similar comparisons. Build or validate the draft to confirm the wording is included.

Written by the indexing model from the issue text.

Description

P2-Bug

We document in [diff.iso] that the types of string literals and character literals are changed, but we dubiously do not document that 0 == 0 (generally, equality and relatioal comparisons) produce int in C but bool in C++.

This feels like a pretty relevant difference, although it's hard to observe in practice because integer promotion gets rid of boolness in lots of cases.

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Forks
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Avg merge
16h 4m
Merged PRs (30d)
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