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fix py::cast<void *>
Pybind11 provides a cast operator between opaque void* pointers on the C++ side and capsules on the Python side. The py::cast<void *> expression was not aware of this possibility and incorrectly triggered a compile-time assertion ("Unable to cast type to reference: value is local to type caster") that is now fixed.
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@ -1611,7 +1611,8 @@ template <typename T> using move_never = none_of<move_always<T>, move_if_unrefer
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// everything else returns a reference/pointer to a local variable.
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// everything else returns a reference/pointer to a local variable.
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template <typename type> using cast_is_temporary_value_reference = bool_constant<
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template <typename type> using cast_is_temporary_value_reference = bool_constant<
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(std::is_reference<type>::value || std::is_pointer<type>::value) &&
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(std::is_reference<type>::value || std::is_pointer<type>::value) &&
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!std::is_base_of<type_caster_generic, make_caster<type>>::value
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!std::is_base_of<type_caster_generic, make_caster<type>>::value &&
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!std::is_same<intrinsic_t<type>, void>::value
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>;
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>;
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// When a value returned from a C++ function is being cast back to Python, we almost always want to
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// When a value returned from a C++ function is being cast back to Python, we almost always want to
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@ -160,4 +160,11 @@ TEST_SUBMODULE(builtin_casters, m) {
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m.def("int_cast", []() {return (int) 42;});
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m.def("int_cast", []() {return (int) 42;});
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m.def("long_cast", []() {return (long) 42;});
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m.def("long_cast", []() {return (long) 42;});
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m.def("longlong_cast", []() {return ULLONG_MAX;});
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m.def("longlong_cast", []() {return ULLONG_MAX;});
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/// test void* cast operator
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m.def("test_void_caster", []() -> bool {
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void *v = (void *) 0xabcd;
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py::object o = py::cast(v);
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return py::cast<void *>(o) == v;
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});
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}
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}
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@ -336,3 +336,7 @@ def test_int_long():
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assert isinstance(m.int_cast(), int)
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assert isinstance(m.int_cast(), int)
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assert isinstance(m.long_cast(), int)
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assert isinstance(m.long_cast(), int)
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assert isinstance(m.longlong_cast(), must_be_long)
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assert isinstance(m.longlong_cast(), must_be_long)
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def test_void_caster_2():
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assert m.test_void_caster()
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