forked from OSchip/llvm-project
81b756e6a3
In order to identify the copy deduction candidate, I considered two approaches: - attempt to determine whether an implicit guide is a copy deduction candidate by checking certain properties of its subsituted parameter during overload-resolution. - using one of the many bits (WillHaveBody) from FunctionDecl (that CXXDeductionGuideDecl inherits from) that are otherwise irrelevant for deduction guides After some brittle gymnastics w the first strategy, I settled on the second, although to avoid confusion and to give that bit a better name, i turned it into a member of an anonymous union. Given this identification 'bit', the tweak to overload resolution was a simple reordering of the deduction guide checks (in SemaOverload.cpp::isBetterOverloadCandidate), in-line with Jason Merrill's p0620r0 drafting which made it into the working paper. Concordant with that, I made sure the copy deduction candidate is always added. References: See https://bugs.llvm.org/show_bug.cgi?id=34970 See http://wg21.link/p0620r0 llvm-svn: 316292 |
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| over.best.ics | ||
| over.ics.rank | ||
| p1.cpp | ||