An improvement to ADL for the name declared by a friend declaration
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Description
[basic.lookup.argdep] p4 is saying:
Argument-dependent lookup finds all declarations of functions and function templates that
- are found by a search of any associated namespace, or
- are declared as a friend ([class.friend]) of any class with a reachable definition in the set of associated entities, or
It sounds like we impose no requirement on the friend declarations when ADL. According to [dcl.meaning.general] p2, the declaration of a friend declaration does not bind a name. we define the concept for wording search that works on the name is bound. It is not suitable for friend declaration. The improvement is:
Argument-dependent lookup finds all declarations of functions and function templates that
- [...], or
- are declared as a friend of any class with a reachable definition in the set of associated entities, where the terminal names of the declarator-ids of the declarations are the same as the name that is being found.
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by locating the draft wording for [basic.lookup.argdep] p4 and compare it with [dcl.meaning.general] p2 and [class.friend]. Check how friend declarations are represented in the draft source, then update the ADL wording so the terminal names of the declarator-ids match the name being found; confirm the resulting specification is consistent with those referenced clauses.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 28/100