Account for C++17 deferred temporary materialization in invocable_r #1282
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...and `is_invocable_r_v`, as required to be able to initialize `std::function<non_movable_type(args...)>` (see DevCom-676429). This fixes DevCom-676429 with Clang, but not MSVC due to a guaranteed copy elision bug VSO-1026729.
StephanTLavavej
requested changes
Sep 18, 2020
StephanTLavavej
requested changes
Sep 18, 2020
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There are ~100 test configs failing; examples:
1: C:\a\1\s\tests\std\tests\Dev11_0535636_functional_overhaul\test.cpp(1647): error C2440: 'initializing': cannot convert from 'test_function::<lambda_8>' to 'std::function<void (std::string &,std::unique_ptr<std::string,std::default_delete<std::string>> &&,std::unique_ptr<int,std::default_delete<int>>)>'
1: C:\a\1\s\tests\std\tests\Dev11_0535636_functional_overhaul\test.cpp(1647): note: No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
1: C:\a\1\s\tests\std\tests\VSO_0105317_expression_sfinae\test.cpp(31): error C2338: is_invocable_r_v<void, Callable, Args...>
1: C:\a\1\s\tests\std\tests\VSO_0105317_expression_sfinae\test.cpp(38): note: see reference to class template instantiation 'HasInvokeResultT<void,Callable,int>' being compiled
1: with
1: [
1: Callable=FP
1: ]
1: C:\a\1\s\tests\std\tests\VSO_0105317_expression_sfinae\test.cpp(54): note: see reference to class template instantiation 'HasResultOfT<FP (int)>' being compiled
StephanTLavavej
approved these changes
Sep 21, 2020
CaseyCarter
commented
Sep 21, 2020
CaseyCarter
commented
Sep 21, 2020
StephanTLavavej
approved these changes
Sep 21, 2020
mnatsuhara
approved these changes
Sep 22, 2020
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Thanks again for fixing this arcane machinery! 🔮 |
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...and
is_invocable_r_v, as required to be able to initializestd::function<non_movable_type(args...)>(see DevCom-676429). Thisfixes DevCom-676429 for Clang, but not MSVC due to a guaranteed copy elision bug VSO-1026729.