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
2707. Deduction guides cannot have a trailing requires-clauseSection: 13.7.2.3 [temp.deduct.guide] Status: DRWP Submitter: Richard Smith Date: 2020-02-26[Accepted as a DR at the March, 2024 meeting.]
The grammar for deduction-guide does not, but should, allow a trailing requires-clause:
deduction-guide: explicit-specifieropt template-name ( parameter-declaration-clause ) -> simple-template-id ;
Proposed resolution (approved by CWG 2023-11-11):
Change the grammar in 13.7.2.3 [temp.deduct.guide] paragraph 1 as follows:
deduction-guide: explicit-specifieropt template-name ( parameter-declaration-clause ) requires-clauseopt -> simple-template-id ;
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