[basic.scope.pdecl] The locus of using-directives are underspecified
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Description
[basic.lookup.unqual] p1 says
A using-directive is active in a scope S at a program point P if it precedes P...
[basic.lookup.general] p2 says
A program point P is said to follow any declaration in the same translation unit whose locus ([basic.scope.pdecl]) is before P.
A declaration X precedes a program point P in a translation unit L if P follows X
Hence, whether a using-directive is active depends on whether its locus is before P. So, what's the locus of a using-directive? We do not find the clue in [basic.scope.pdecl]. We should add the omitted part about the locus of using-directives
The locus of a using-directive is immediately after the using-directive.
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Research direction
Start with [basic.scope.pdecl] and compare its wording with the cited paragraphs in [basic.lookup.unqual] and [basic.lookup.general]. Add the specified rule for the locus of a using-directive, then verify that the surrounding standard wording consistently determines when the directive precedes a program point.
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Assessment
- Tech stack
- tex
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 1/5
- Estimated time
- 1-3 hours
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 45/100