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/* | |
tests/test_multiple_inheritance.cpp -- multiple inheritance, | |
implicit MI casts | |
Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch> | |
All rights reserved. Use of this source code is governed by a | |
BSD-style license that can be found in the LICENSE file. | |
*/ | |
// Many bases for testing that multiple inheritance from many classes (i.e. requiring extra | |
// space for holder constructed flags) works. | |
template <int N> struct BaseN { | |
BaseN(int i) : i(i) { } | |
int i; | |
}; | |
// test_mi_static_properties | |
struct Vanilla { | |
std::string vanilla() { return "Vanilla"; }; | |
}; | |
struct WithStatic1 { | |
static std::string static_func1() { return "WithStatic1"; }; | |
static int static_value1; | |
}; | |
struct WithStatic2 { | |
static std::string static_func2() { return "WithStatic2"; }; | |
static int static_value2; | |
}; | |
struct VanillaStaticMix1 : Vanilla, WithStatic1, WithStatic2 { | |
static std::string static_func() { return "VanillaStaticMix1"; } | |
static int static_value; | |
}; | |
struct VanillaStaticMix2 : WithStatic1, Vanilla, WithStatic2 { | |
static std::string static_func() { return "VanillaStaticMix2"; } | |
static int static_value; | |
}; | |
int WithStatic1::static_value1 = 1; | |
int WithStatic2::static_value2 = 2; | |
int VanillaStaticMix1::static_value = 12; | |
int VanillaStaticMix2::static_value = 12; | |
TEST_SUBMODULE(multiple_inheritance, m) { | |
// test_multiple_inheritance_mix1 | |
// test_multiple_inheritance_mix2 | |
struct Base1 { | |
Base1(int i) : i(i) { } | |
int foo() { return i; } | |
int i; | |
}; | |
py::class_<Base1> b1(m, "Base1"); | |
b1.def(py::init<int>()) | |
.def("foo", &Base1::foo); | |
struct Base2 { | |
Base2(int i) : i(i) { } | |
int bar() { return i; } | |
int i; | |
}; | |
py::class_<Base2> b2(m, "Base2"); | |
b2.def(py::init<int>()) | |
.def("bar", &Base2::bar); | |
// test_multiple_inheritance_cpp | |
struct Base12 : Base1, Base2 { | |
Base12(int i, int j) : Base1(i), Base2(j) { } | |
}; | |
struct MIType : Base12 { | |
MIType(int i, int j) : Base12(i, j) { } | |
}; | |
py::class_<Base12, Base1, Base2>(m, "Base12"); | |
py::class_<MIType, Base12>(m, "MIType") | |
.def(py::init<int, int>()); | |
// test_multiple_inheritance_python_many_bases | |
PYBIND11_BASEN( 1); PYBIND11_BASEN( 2); PYBIND11_BASEN( 3); PYBIND11_BASEN( 4); | |
PYBIND11_BASEN( 5); PYBIND11_BASEN( 6); PYBIND11_BASEN( 7); PYBIND11_BASEN( 8); | |
PYBIND11_BASEN( 9); PYBIND11_BASEN(10); PYBIND11_BASEN(11); PYBIND11_BASEN(12); | |
PYBIND11_BASEN(13); PYBIND11_BASEN(14); PYBIND11_BASEN(15); PYBIND11_BASEN(16); | |
PYBIND11_BASEN(17); | |
// Uncommenting this should result in a compile time failure (MI can only be specified via | |
// template parameters because pybind has to know the types involved; see discussion in #742 for | |
// details). | |
// struct Base12v2 : Base1, Base2 { | |
// Base12v2(int i, int j) : Base1(i), Base2(j) { } | |
// }; | |
// py::class_<Base12v2>(m, "Base12v2", b1, b2) | |
// .def(py::init<int, int>()); | |
// test_multiple_inheritance_virtbase | |
// Test the case where not all base classes are specified, and where pybind11 requires the | |
// py::multiple_inheritance flag to perform proper casting between types. | |
struct Base1a { | |
Base1a(int i) : i(i) { } | |
int foo() { return i; } | |
int i; | |
}; | |
py::class_<Base1a, std::shared_ptr<Base1a>>(m, "Base1a") | |
.def(py::init<int>()) | |
.def("foo", &Base1a::foo); | |
struct Base2a { | |
Base2a(int i) : i(i) { } | |
int bar() { return i; } | |
int i; | |
}; | |
py::class_<Base2a, std::shared_ptr<Base2a>>(m, "Base2a") | |
.def(py::init<int>()) | |
.def("bar", &Base2a::bar); | |
struct Base12a : Base1a, Base2a { | |
Base12a(int i, int j) : Base1a(i), Base2a(j) { } | |
}; | |
py::class_<Base12a, /* Base1 missing */ Base2a, | |
std::shared_ptr<Base12a>>(m, "Base12a", py::multiple_inheritance()) | |
.def(py::init<int, int>()); | |
m.def("bar_base2a", [](Base2a *b) { return b->bar(); }); | |
m.def("bar_base2a_sharedptr", [](std::shared_ptr<Base2a> b) { return b->bar(); }); | |
// test_mi_unaligned_base | |
// test_mi_base_return | |
// Issue #801: invalid casting to derived type with MI bases | |
struct I801B1 { int a = 1; I801B1() = default; I801B1(const I801B1 &) = default; virtual ~I801B1() = default; }; | |
struct I801B2 { int b = 2; I801B2() = default; I801B2(const I801B2 &) = default; virtual ~I801B2() = default; }; | |
struct I801C : I801B1, I801B2 {}; | |
struct I801D : I801C {}; // Indirect MI | |
// Unregistered classes: | |
struct I801B3 { int c = 3; virtual ~I801B3() = default; }; | |
struct I801E : I801B3, I801D {}; | |
py::class_<I801B1, std::shared_ptr<I801B1>>(m, "I801B1").def(py::init<>()).def_readonly("a", &I801B1::a); | |
py::class_<I801B2, std::shared_ptr<I801B2>>(m, "I801B2").def(py::init<>()).def_readonly("b", &I801B2::b); | |
py::class_<I801C, I801B1, I801B2, std::shared_ptr<I801C>>(m, "I801C").def(py::init<>()); | |
py::class_<I801D, I801C, std::shared_ptr<I801D>>(m, "I801D").def(py::init<>()); | |
// Two separate issues here: first, we want to recognize a pointer to a base type as being a | |
// known instance even when the pointer value is unequal (i.e. due to a non-first | |
// multiple-inheritance base class): | |
m.def("i801b1_c", [](I801C *c) { return static_cast<I801B1 *>(c); }); | |
m.def("i801b2_c", [](I801C *c) { return static_cast<I801B2 *>(c); }); | |
m.def("i801b1_d", [](I801D *d) { return static_cast<I801B1 *>(d); }); | |
m.def("i801b2_d", [](I801D *d) { return static_cast<I801B2 *>(d); }); | |
// Second, when returned a base class pointer to a derived instance, we cannot assume that the | |
// pointer is `reinterpret_cast`able to the derived pointer because, like above, the base class | |
// pointer could be offset. | |
m.def("i801c_b1", []() -> I801B1 * { return new I801C(); }); | |
m.def("i801c_b2", []() -> I801B2 * { return new I801C(); }); | |
m.def("i801d_b1", []() -> I801B1 * { return new I801D(); }); | |
m.def("i801d_b2", []() -> I801B2 * { return new I801D(); }); | |
// Return a base class pointer to a pybind-registered type when the actual derived type | |
// isn't pybind-registered (and uses multiple-inheritance to offset the pybind base) | |
m.def("i801e_c", []() -> I801C * { return new I801E(); }); | |
m.def("i801e_b2", []() -> I801B2 * { return new I801E(); }); | |
// test_mi_static_properties | |
py::class_<Vanilla>(m, "Vanilla") | |
.def(py::init<>()) | |
.def("vanilla", &Vanilla::vanilla); | |
py::class_<WithStatic1>(m, "WithStatic1") | |
.def(py::init<>()) | |
.def_static("static_func1", &WithStatic1::static_func1) | |
.def_readwrite_static("static_value1", &WithStatic1::static_value1); | |
py::class_<WithStatic2>(m, "WithStatic2") | |
.def(py::init<>()) | |
.def_static("static_func2", &WithStatic2::static_func2) | |
.def_readwrite_static("static_value2", &WithStatic2::static_value2); | |
py::class_<VanillaStaticMix1, Vanilla, WithStatic1, WithStatic2>( | |
m, "VanillaStaticMix1") | |
.def(py::init<>()) | |
.def_static("static_func", &VanillaStaticMix1::static_func) | |
.def_readwrite_static("static_value", &VanillaStaticMix1::static_value); | |
py::class_<VanillaStaticMix2, WithStatic1, Vanilla, WithStatic2>( | |
m, "VanillaStaticMix2") | |
.def(py::init<>()) | |
.def_static("static_func", &VanillaStaticMix2::static_func) | |
.def_readwrite_static("static_value", &VanillaStaticMix2::static_value); | |
struct WithDict { }; | |
struct VanillaDictMix1 : Vanilla, WithDict { }; | |
struct VanillaDictMix2 : WithDict, Vanilla { }; | |
py::class_<WithDict>(m, "WithDict", py::dynamic_attr()).def(py::init<>()); | |
py::class_<VanillaDictMix1, Vanilla, WithDict>(m, "VanillaDictMix1").def(py::init<>()); | |
py::class_<VanillaDictMix2, WithDict, Vanilla>(m, "VanillaDictMix2").def(py::init<>()); | |
// test_diamond_inheritance | |
// Issue #959: segfault when constructing diamond inheritance instance | |
// All of these have int members so that there will be various unequal pointers involved. | |
struct B { int b; B() = default; B(const B&) = default; virtual ~B() = default; }; | |
struct C0 : public virtual B { int c0; }; | |
struct C1 : public virtual B { int c1; }; | |
struct D : public C0, public C1 { int d; }; | |
py::class_<B>(m, "B") | |
.def("b", [](B *self) { return self; }); | |
py::class_<C0, B>(m, "C0") | |
.def("c0", [](C0 *self) { return self; }); | |
py::class_<C1, B>(m, "C1") | |
.def("c1", [](C1 *self) { return self; }); | |
py::class_<D, C0, C1>(m, "D") | |
.def(py::init<>()); | |
} | |