src: simplify is_callable by making it a concept #58169
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tniessen
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Using a C++20 `concept` here makes `is_callable` much simpler than relying on SFINAE. It is equivalent for function types, `std::function`, lambdas, and classes with `operator()`, regardless of argument or return types.
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May 4, 2025
| @@ -111,7 +111,7 @@ struct CallLibuvFunction<ReqT, void(*)(ReqT*, Args...)> { | |||
| template <typename ReqT, typename T> | |||
| struct MakeLibuvRequestCallback { | |||
| static T For(ReqWrap<ReqT>* req_wrap, T v) { | |||
| static_assert(!is_callable<T>::value, | |||
| static_assert(!is_callable<T>, | |||
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You can change type name T to is_callable T and remove this static_assertion.
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## main #58169 +/- ##
=======================================
Coverage 90.13% 90.14%
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Files 630 630
Lines 186611 186611
Branches 36631 36634 +3
=======================================
+ Hits 168204 168220 +16
+ Misses 11192 11183 -9
+ Partials 7215 7208 -7
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Using a C++20
concepthere makesis_callablemuch simpler than relying on SFINAE. It is equivalent for function types,std::function, lambdas, and classes withoperator(), regardless of argument or return types.