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/*
tests/test_inheritance.cpp -- inheritance, automatic upcasting for polymorphic types
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.
*/
#include "pybind11_tests.h"
class Pet {
public:
Pet(const std::string &name, const std::string &species)
: m_name(name), m_species(species) {}
std::string name() const { return m_name; }
std::string species() const { return m_species; }
private:
std::string m_name;
std::string m_species;
};
class Dog : public Pet {
public:
Dog(const std::string &name) : Pet(name, "dog") {}
std::string bark() const { return "Woof!"; }
};
class Rabbit : public Pet {
public:
Rabbit(const std::string &name) : Pet(name, "parrot") {}
};
class Hamster : public Pet {
public:
Hamster(const std::string &name) : Pet(name, "rodent") {}
};
class Chimera : public Pet {
Chimera() : Pet("Kimmy", "chimera") {}
};
std::string pet_name_species(const Pet &pet) {
return pet.name() + " is a " + pet.species();
}
std::string dog_bark(const Dog &dog) {
return dog.bark();
}
struct BaseClass { virtual ~BaseClass() {} };
struct DerivedClass1 : BaseClass { };
struct DerivedClass2 : BaseClass { };
struct MismatchBase1 { };
struct MismatchDerived1 : MismatchBase1 { };
struct MismatchBase2 { };
struct MismatchDerived2 : MismatchBase2 { };
test_initializer inheritance([](py::module &m) {
py::class_<Pet> pet_class(m, "Pet");
pet_class
.def(py::init<std::string, std::string>())
.def("name", &Pet::name)
.def("species", &Pet::species);
/* One way of declaring a subclass relationship: reference parent's class_ object */
py::class_<Dog>(m, "Dog", pet_class)
.def(py::init<std::string>());
/* Another way of declaring a subclass relationship: reference parent's C++ type */
py::class_<Rabbit, Pet>(m, "Rabbit")
.def(py::init<std::string>());
/* And another: list parent in class template arguments */
py::class_<Hamster, Pet>(m, "Hamster")
.def(py::init<std::string>());
py::class_<Chimera, Pet>(m, "Chimera");
m.def("pet_name_species", pet_name_species);
m.def("dog_bark", dog_bark);
py::class_<BaseClass>(m, "BaseClass").def(py::init<>());
py::class_<DerivedClass1>(m, "DerivedClass1").def(py::init<>());
py::class_<DerivedClass2>(m, "DerivedClass2").def(py::init<>());
m.def("return_class_1", []() -> BaseClass* { return new DerivedClass1(); });
m.def("return_class_2", []() -> BaseClass* { return new DerivedClass2(); });
m.def("return_class_n", [](int n) -> BaseClass* {
if (n == 1) return new DerivedClass1();
if (n == 2) return new DerivedClass2();
return new BaseClass();
});
m.def("return_none", []() -> BaseClass* { return nullptr; });
m.def("test_isinstance", [](py::list l) {
struct Unregistered { }; // checks missing type_info code path
return py::make_tuple(
py::isinstance<py::tuple>(l[0]),
py::isinstance<py::dict>(l[1]),
py::isinstance<Pet>(l[2]),
py::isinstance<Pet>(l[3]),
py::isinstance<Dog>(l[4]),
py::isinstance<Rabbit>(l[5]),
py::isinstance<Unregistered>(l[6])
);
});
m.def("test_mismatched_holder_type_1", []() {
auto m = py::module::import("__main__");
py::class_<MismatchBase1, std::shared_ptr<MismatchBase1>>(m, "MismatchBase1");
py::class_<MismatchDerived1, MismatchBase1>(m, "MismatchDerived1");
});
m.def("test_mismatched_holder_type_2", []() {
auto m = py::module::import("__main__");
py::class_<MismatchBase2>(m, "MismatchBase2");
py::class_<MismatchDerived2, std::shared_ptr<MismatchDerived2>, MismatchBase2>(m, "MismatchDerived2");
});
});
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