[cxx-interop] Initial tests for std::function usage
#70772
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@swift-ci please smoke test |
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yay! |
hyp
approved these changes
Jan 9, 2024
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The Windows failure is interesting, I think we might be treating |
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This makes sure that `std::function` is imported consistently on supported platforms, and that it allows basic usage: calling a function with `callAsFunction`, initializing an empty function, and passing a function retrieved from C++ back to C++ as a parameter. rdar://103979602
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`clangSema.isCompleteType` checks for decl visibility according to the module visibility rules, which we don't actually need. What we need to check is whether the record has a definition – this is the check we already use elsewhere in ClangImporter. This makes sure that we can import `std::function` on Windows. rdar://103979602
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The new failure on Windows: |
The test was passing by accident: we didn't properly check `std::pair` type for completeness, and assumed that it is incomplete. This updates the test to actually verify the behavior that is specified in the vision document.
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In libstdc++ 11, `std::pair` has a base class `std::__pair_base`, which defines a copy constructor. We still continue not treating `std::pair` as an owned type, just like on other platforms.
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Hmm, adding explicit imports helps with the Windows failure... import CxxStdlib
import CxxStdlib.functionalIt seems there is something wrong with Clang Sema's module visibility check |
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Ahhh we were missing |
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This makes sure that
std::functionis imported consistently on supported platforms, and that it allows basic usage: calling a function withcallAsFunction, initializing an empty function, and passing a function retrieved from C++ back to C++ as a parameter.rdar://103979602