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/*
    tests/test_class.cpp -- test py::class_ definitions and basic functionality

    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"
#include "constructor_stats.h"
#include "local_bindings.h"
#include <pybind11/stl.h>

#if defined(_MSC_VER)
#  pragma warning(disable: 4324) // warning C4324: structure was padded due to alignment specifier
#endif

// test_brace_initialization
struct NoBraceInitialization {
    NoBraceInitialization(std::vector<int> v) : vec{std::move(v)} {}
    template <typename T>
    NoBraceInitialization(std::initializer_list<T> l) : vec(l) {}

    std::vector<int> vec;
};

TEST_SUBMODULE(class_, m) {
    // test_instance
    struct NoConstructor {
        NoConstructor() = default;
        NoConstructor(const NoConstructor &) = default;
        NoConstructor(NoConstructor &&) = default;
        static NoConstructor *new_instance() {
            auto *ptr = new NoConstructor();
            print_created(ptr, "via new_instance");
            return ptr;
        }
        ~NoConstructor() { print_destroyed(this); }
    };

    py::class_<NoConstructor>(m, "NoConstructor")
        .def_static("new_instance", &NoConstructor::new_instance, "Return an instance");

    // test_inheritance
    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") {}
    };

    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>());

    /* Constructors are not inherited by default */
    py::class_<Chimera, Pet>(m, "Chimera");

    m.def("pet_name_species", [](const Pet &pet) { return pet.name() + " is a " + pet.species(); });
    m.def("dog_bark", [](const Dog &dog) { return dog.bark(); });

    // test_automatic_upcasting
    struct BaseClass {
        BaseClass() = default;
        BaseClass(const BaseClass &) = default;
        BaseClass(BaseClass &&) = default;
        virtual ~BaseClass() = default;
    };
    struct DerivedClass1 : BaseClass { };
    struct DerivedClass2 : BaseClass { };

    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; });

    // test_isinstance
    m.def("check_instances", [](py::list l) {
        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<UnregisteredType>(l[6])
        );
    });

    struct Invalid {};

    // test_type
    m.def("check_type", [](int category) {
        // Currently not supported (via a fail at compile time)
        // See https://github.com/pybind/pybind11/issues/2486
        // if (category == 2)
        //     return py::type::of<int>();
        if (category == 1)
            return py::type::of<DerivedClass1>();
        else
            return py::type::of<Invalid>();
    });

    m.def("get_type_of", [](py::object ob) {
        return py::type::of(ob);
    });

    m.def("get_type_classic", [](py::handle h) {
        return h.get_type();
    });

    m.def("as_type", [](py::object ob) {
        return py::type(ob);
    });

    // test_mismatched_holder
    struct MismatchBase1 { };
    struct MismatchDerived1 : MismatchBase1 { };

    struct MismatchBase2 { };
    struct MismatchDerived2 : MismatchBase2 { };

    m.def("mismatched_holder_1", []() {
        auto mod = py::module_::import("__main__");
        py::class_<MismatchBase1, std::shared_ptr<MismatchBase1>>(mod, "MismatchBase1");
        py::class_<MismatchDerived1, MismatchBase1>(mod, "MismatchDerived1");
    });
    m.def("mismatched_holder_2", []() {
        auto mod = py::module_::import("__main__");
        py::class_<MismatchBase2>(mod, "MismatchBase2");
        py::class_<MismatchDerived2, std::shared_ptr<MismatchDerived2>,
                   MismatchBase2>(mod, "MismatchDerived2");
    });

    // test_override_static
    // #511: problem with inheritance + overwritten def_static
    struct MyBase {
        static std::unique_ptr<MyBase> make() {
            return std::unique_ptr<MyBase>(new MyBase());
        }
    };

    struct MyDerived : MyBase {
        static std::unique_ptr<MyDerived> make() {
            return std::unique_ptr<MyDerived>(new MyDerived());
        }
    };

    py::class_<MyBase>(m, "MyBase")
        .def_static("make", &MyBase::make);

    py::class_<MyDerived, MyBase>(m, "MyDerived")
        .def_static("make", &MyDerived::make)
        .def_static("make2", &MyDerived::make);

    // test_implicit_conversion_life_support
    struct ConvertibleFromUserType {
        int i;

        ConvertibleFromUserType(UserType u) : i(u.value()) { }
    };

    py::class_<ConvertibleFromUserType>(m, "AcceptsUserType")
        .def(py::init<UserType>());
    py::implicitly_convertible<UserType, ConvertibleFromUserType>();

    m.def("implicitly_convert_argument", [](const ConvertibleFromUserType &r) { return r.i; });
    m.def("implicitly_convert_variable", [](py::object o) {
        // `o` is `UserType` and `r` is a reference to a temporary created by implicit
        // conversion. This is valid when called inside a bound function because the temp
        // object is attached to the same life support system as the arguments.
        const auto &r = o.cast<const ConvertibleFromUserType &>();
        return r.i;
    });
    m.add_object("implicitly_convert_variable_fail", [&] {
        auto f = [](PyObject *, PyObject *args) -> PyObject * {
            auto o = py::reinterpret_borrow<py::tuple>(args)[0];
            try { // It should fail here because there is no life support.
                o.cast<const ConvertibleFromUserType &>();
            } catch (const py::cast_error &e) {
                return py::str(e.what()).release().ptr();
            }
            return py::str().release().ptr();
        };

        auto def = new PyMethodDef{"f", f, METH_VARARGS, nullptr};
        return py::reinterpret_steal<py::object>(PyCFunction_NewEx(def, nullptr, m.ptr()));
    }());

    // test_operator_new_delete
    struct HasOpNewDel {
        std::uint64_t i;
        static void *operator new(size_t s) { py::print("A new", s); return ::operator new(s); }
        static void *operator new(size_t s, void *ptr) { py::print("A placement-new", s); return ptr; }
        static void operator delete(void *p) { py::print("A delete"); return ::operator delete(p); }
    };
    struct HasOpNewDelSize {
        std::uint32_t i;
        static void *operator new(size_t s) { py::print("B new", s); return ::operator new(s); }
        static void *operator new(size_t s, void *ptr) { py::print("B placement-new", s); return ptr; }
        static void operator delete(void *p, size_t s) { py::print("B delete", s); return ::operator delete(p); }
    };
    struct AliasedHasOpNewDelSize {
        std::uint64_t i;
        static void *operator new(size_t s) { py::print("C new", s); return ::operator new(s); }
        static void *operator new(size_t s, void *ptr) { py::print("C placement-new", s); return ptr; }
        static void operator delete(void *p, size_t s) { py::print("C delete", s); return ::operator delete(p); }
        virtual ~AliasedHasOpNewDelSize() = default;
        AliasedHasOpNewDelSize() = default;
        AliasedHasOpNewDelSize(const AliasedHasOpNewDelSize&) = delete;
    };
    struct PyAliasedHasOpNewDelSize : AliasedHasOpNewDelSize {
        PyAliasedHasOpNewDelSize() = default;
        PyAliasedHasOpNewDelSize(int) { }
        std::uint64_t j;
    };
    struct HasOpNewDelBoth {
        std::uint32_t i[8];
        static void *operator new(size_t s) { py::print("D new", s); return ::operator new(s); }
        static void *operator new(size_t s, void *ptr) { py::print("D placement-new", s); return ptr; }
        static void operator delete(void *p) { py::print("D delete"); return ::operator delete(p); }
        static void operator delete(void *p, size_t s) { py::print("D wrong delete", s); return ::operator delete(p); }
    };
    py::class_<HasOpNewDel>(m, "HasOpNewDel").def(py::init<>());


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