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86d825f330
Sergey Lyskov pointed out that the trampoline mechanism used to override
virtual methods from within Python caused unnecessary overheads when
instantiating the original (i.e. non-extended) class.
This commit removes this inefficiency, but some syntax changes were
needed to achieve this. Projects using this features will need to make a
few changes:
In particular, the example below shows the old syntax to instantiate a
class with a trampoline:
class_<TrampolineClass>("MyClass")
.alias<MyClass>()
....
This is what should be used now:
class_<MyClass, std::unique_ptr<MyClass, TrampolineClass>("MyClass")
....
Importantly, the trampoline class is now specified as the *third*
argument to the class_ template, and the alias<..>() call is gone. The
second argument with the unique pointer is simply the default holder
type used by pybind11.
21 lines
619 B
Plaintext
21 lines
619 B
Plaintext
const char *
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c
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Failed as expected: Tried to call pure virtual function "Base::dispatch"
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Yay..
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[Placeholder[1], Placeholder[2], Placeholder[3], Placeholder[4]]
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[3, 5, 7, 9, 11, 13, 15]
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0==0, 1==1, 2==2, 3==3, 4==4, 5==5, 6==6, 7==7, 8==8, 9==9,
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Failed as expected: Incompatible function arguments. The following argument types are supported:
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1. (example.issues.ElementA) -> NoneType
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Invoked with: None
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Failed as expected: Incompatible function arguments. The following argument types are supported:
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1. (int) -> int
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Invoked with: 5.2
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12.0
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C++ version
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A.f()
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Python version
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PyA.PyA()
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PyA.f()
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In python f()
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