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
1892. Use of auto in function typeSection: 9.2.9.7 [dcl.spec.auto] Status: CD4 Submitter: Richard Smith Date: 2014-03-12[Moved to DR at the November, 2014 meeting.]
There appear to be no restrictions against using the auto specifier in examples like the following:
template<typename T> using X = T; X<auto()> f_with_deduced_return_type; // ok std::vector<auto(*)()> v; // ok?! void f(auto (*)()); // ok?!
Proposed resolution (June, 2014):
Change 9.2.9.7 [dcl.spec.auto] paragraph 2 as follows:
The placeholder type can appear with a function declarator in the decl-specifier-seq, type-specifier-seq, conversion-function-id, or trailing-return-type, in any context where such a declarator is valid. If the function declarator includes a trailing-return-type (9.3.4.6 [dcl.fct]), that specifies the declared return type of the function. Otherwise, the function declarator shall declare a function. If the declared return type of the function contains a placeholder type, the return type of the function is deduced from return statements in the body of the function, if any.
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