Comments (3)
I solved the problem :
https://developercommunity.visualstudio.com/content/problem/571058/error-c2672-operator-surrogate-func-no-matching-ov.html
on godbolt it works only with msvc v19.28 and compiler option = /std:c++latest
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It looks like a bug, as the intent is to have this work on at least vs2017 without the /std:c++latest
option. I'll investigate. Thanks for the report.
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Like I understood it just Msvc can't deduce the return value type in this case however in simple case such as auto f() - >decltype (h()) { return h() ;} then he can and another example if I set concrete return type for tag invoke instead of deduction type it works then. Sorry for my English.
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