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
1878. operator auto templateSection: 9.2.9.7 [dcl.spec.auto] Status: CD4 Submitter: Daveed Vandevoorde Date: 2014-02-20[Moved to DR at the November, 2014 meeting.]
The Standard currently appears to allow something like
struct S {
template<class T> operator auto() { return 42; }
};
This is of very limited utility and presents difficulties for some implementations. It might be good to prohibit such constructs.
Proposed resolution (October, 2014):
Add the following as the last paragraph of 11.4.8.3 [class.conv.fct]:
A conversion function template shall not have a deduced return type (9.2.9.7 [dcl.spec.auto]).
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