This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 117b. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2025-08-11
2620. Nonsensical disambiguation ruleSection: 9.3.3 [dcl.ambig.res] Status: C++23 Submitter: Krystian Stasiowski Date: 2019-04-18[Accepted as a DR at the November, 2022 meeting.]
Subclause 9.3.3 [dcl.ambig.res] paragraph 1 specifies:
The ambiguity arising from the similarity between a function-style cast and a declaration mentioned in 8.11 [stmt.ambig] can also occur in the context of a declaration. In that context, the choice is between a function declaration with a redundant set of parentheses around a parameter name and an object declaration with a function-style cast as the initializer. Just as for the ambiguities mentioned in 8.11 [stmt.ambig], the resolution is to consider any construct that could possibly be a declaration a declaration.
The specification correctly describes an ambiguity between a function declaration and an object declaration, but resolves the ambiguity to a "declaration", which does not offer any insight.
Proposed resolution (2022-09-09) [SUPERSEDED]:
Change in 9.3.3 [dcl.ambig.res] paragraph 1 as follows:
... Just as for the ambiguities mentioned in 8.11 [stmt.ambig], the The resolution is to consider any construct that could possibly be a function declaration a function declaration.
Proposed resolution (approved by CWG 2022-09-23):
Change in 9.3.3 [dcl.ambig.res] paragraph 1 as follows:
The ambiguity arising from the similarity between a function-style cast and a declaration mentioned in 8.11 [stmt.ambig] can also occur in the context of a declaration. In that context, the choice is between a function declaration with a redundant set of parentheses around a parameter name and an object declaration with a function-style cast as the initializer and a declaration involving a function declarator with a redundant set of parentheses around a parameter name. Just as for the ambiguities mentioned in 8.11 [stmt.ambig], the resolution is to consider any construct , such as the potential parameter declaration, that could possibly be a declaration to be a declaration.
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