423 lines
17 KiB
C++
423 lines
17 KiB
C++
/*
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tests/test_class.cpp -- test py::class_ definitions and basic functionality
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Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
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All rights reserved. Use of this source code is governed by a
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BSD-style license that can be found in the LICENSE file.
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*/
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#include "pybind11_tests.h"
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#include "constructor_stats.h"
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#include "local_bindings.h"
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#include <pybind11/stl.h>
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#if defined(_MSC_VER)
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# pragma warning(disable: 4324) // warning C4324: structure was padded due to alignment specifier
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#endif
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// test_brace_initialization
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struct NoBraceInitialization {
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NoBraceInitialization(std::vector<int> v) : vec{std::move(v)} {}
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template <typename T>
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NoBraceInitialization(std::initializer_list<T> l) : vec(l) {}
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std::vector<int> vec;
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};
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TEST_SUBMODULE(class_, m) {
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// test_instance
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struct NoConstructor {
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NoConstructor() = default;
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NoConstructor(const NoConstructor &) = default;
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NoConstructor(NoConstructor &&) = default;
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static NoConstructor *new_instance() {
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auto *ptr = new NoConstructor();
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print_created(ptr, "via new_instance");
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return ptr;
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}
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~NoConstructor() { print_destroyed(this); }
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};
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py::class_<NoConstructor>(m, "NoConstructor")
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.def_static("new_instance", &NoConstructor::new_instance, "Return an instance");
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// test_inheritance
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class Pet {
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public:
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Pet(const std::string &name, const std::string &species)
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: m_name(name), m_species(species) {}
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std::string name() const { return m_name; }
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std::string species() const { return m_species; }
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private:
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std::string m_name;
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std::string m_species;
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};
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class Dog : public Pet {
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public:
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Dog(const std::string &name) : Pet(name, "dog") {}
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std::string bark() const { return "Woof!"; }
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};
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class Rabbit : public Pet {
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public:
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Rabbit(const std::string &name) : Pet(name, "parrot") {}
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};
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class Hamster : public Pet {
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public:
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Hamster(const std::string &name) : Pet(name, "rodent") {}
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};
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class Chimera : public Pet {
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Chimera() : Pet("Kimmy", "chimera") {}
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};
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py::class_<Pet> pet_class(m, "Pet");
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pet_class
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.def(py::init<std::string, std::string>())
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.def("name", &Pet::name)
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.def("species", &Pet::species);
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/* One way of declaring a subclass relationship: reference parent's class_ object */
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py::class_<Dog>(m, "Dog", pet_class)
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.def(py::init<std::string>());
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/* Another way of declaring a subclass relationship: reference parent's C++ type */
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py::class_<Rabbit, Pet>(m, "Rabbit")
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.def(py::init<std::string>());
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/* And another: list parent in class template arguments */
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py::class_<Hamster, Pet>(m, "Hamster")
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.def(py::init<std::string>());
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/* Constructors are not inherited by default */
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py::class_<Chimera, Pet>(m, "Chimera");
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m.def("pet_name_species", [](const Pet &pet) { return pet.name() + " is a " + pet.species(); });
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m.def("dog_bark", [](const Dog &dog) { return dog.bark(); });
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// test_automatic_upcasting
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struct BaseClass {
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BaseClass() = default;
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BaseClass(const BaseClass &) = default;
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BaseClass(BaseClass &&) = default;
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virtual ~BaseClass() {}
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};
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struct DerivedClass1 : BaseClass { };
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struct DerivedClass2 : BaseClass { };
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py::class_<BaseClass>(m, "BaseClass").def(py::init<>());
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py::class_<DerivedClass1>(m, "DerivedClass1").def(py::init<>());
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py::class_<DerivedClass2>(m, "DerivedClass2").def(py::init<>());
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m.def("return_class_1", []() -> BaseClass* { return new DerivedClass1(); });
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m.def("return_class_2", []() -> BaseClass* { return new DerivedClass2(); });
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m.def("return_class_n", [](int n) -> BaseClass* {
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if (n == 1) return new DerivedClass1();
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if (n == 2) return new DerivedClass2();
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return new BaseClass();
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});
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m.def("return_none", []() -> BaseClass* { return nullptr; });
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// test_isinstance
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m.def("check_instances", [](py::list l) {
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return py::make_tuple(
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py::isinstance<py::tuple>(l[0]),
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py::isinstance<py::dict>(l[1]),
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py::isinstance<Pet>(l[2]),
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py::isinstance<Pet>(l[3]),
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py::isinstance<Dog>(l[4]),
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py::isinstance<Rabbit>(l[5]),
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py::isinstance<UnregisteredType>(l[6])
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);
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});
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// test_mismatched_holder
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struct MismatchBase1 { };
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struct MismatchDerived1 : MismatchBase1 { };
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struct MismatchBase2 { };
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struct MismatchDerived2 : MismatchBase2 { };
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m.def("mismatched_holder_1", []() {
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auto mod = py::module::import("__main__");
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py::class_<MismatchBase1, std::shared_ptr<MismatchBase1>>(mod, "MismatchBase1");
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py::class_<MismatchDerived1, MismatchBase1>(mod, "MismatchDerived1");
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});
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m.def("mismatched_holder_2", []() {
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auto mod = py::module::import("__main__");
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py::class_<MismatchBase2>(mod, "MismatchBase2");
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py::class_<MismatchDerived2, std::shared_ptr<MismatchDerived2>,
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MismatchBase2>(mod, "MismatchDerived2");
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});
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// test_override_static
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// #511: problem with inheritance + overwritten def_static
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struct MyBase {
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static std::unique_ptr<MyBase> make() {
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return std::unique_ptr<MyBase>(new MyBase());
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}
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};
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struct MyDerived : MyBase {
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static std::unique_ptr<MyDerived> make() {
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return std::unique_ptr<MyDerived>(new MyDerived());
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}
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};
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py::class_<MyBase>(m, "MyBase")
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.def_static("make", &MyBase::make);
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py::class_<MyDerived, MyBase>(m, "MyDerived")
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.def_static("make", &MyDerived::make)
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.def_static("make2", &MyDerived::make);
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// test_implicit_conversion_life_support
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struct ConvertibleFromUserType {
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int i;
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ConvertibleFromUserType(UserType u) : i(u.value()) { }
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};
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py::class_<ConvertibleFromUserType>(m, "AcceptsUserType")
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.def(py::init<UserType>());
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py::implicitly_convertible<UserType, ConvertibleFromUserType>();
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m.def("implicitly_convert_argument", [](const ConvertibleFromUserType &r) { return r.i; });
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m.def("implicitly_convert_variable", [](py::object o) {
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// `o` is `UserType` and `r` is a reference to a temporary created by implicit
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// conversion. This is valid when called inside a bound function because the temp
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// object is attached to the same life support system as the arguments.
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const auto &r = o.cast<const ConvertibleFromUserType &>();
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return r.i;
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});
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m.add_object("implicitly_convert_variable_fail", [&] {
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auto f = [](PyObject *, PyObject *args) -> PyObject * {
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auto o = py::reinterpret_borrow<py::tuple>(args)[0];
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try { // It should fail here because there is no life support.
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o.cast<const ConvertibleFromUserType &>();
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} catch (const py::cast_error &e) {
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return py::str(e.what()).release().ptr();
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}
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return py::str().release().ptr();
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};
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auto def = new PyMethodDef{"f", f, METH_VARARGS, nullptr};
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return py::reinterpret_steal<py::object>(PyCFunction_NewEx(def, nullptr, m.ptr()));
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}());
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// test_operator_new_delete
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struct HasOpNewDel {
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std::uint64_t i;
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static void *operator new(size_t s) { py::print("A new", s); return ::operator new(s); }
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static void *operator new(size_t s, void *ptr) { py::print("A placement-new", s); return ptr; }
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static void operator delete(void *p) { py::print("A delete"); return ::operator delete(p); }
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};
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struct HasOpNewDelSize {
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std::uint32_t i;
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static void *operator new(size_t s) { py::print("B new", s); return ::operator new(s); }
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static void *operator new(size_t s, void *ptr) { py::print("B placement-new", s); return ptr; }
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static void operator delete(void *p, size_t s) { py::print("B delete", s); return ::operator delete(p); }
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};
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struct AliasedHasOpNewDelSize {
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std::uint64_t i;
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static void *operator new(size_t s) { py::print("C new", s); return ::operator new(s); }
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static void *operator new(size_t s, void *ptr) { py::print("C placement-new", s); return ptr; }
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static void operator delete(void *p, size_t s) { py::print("C delete", s); return ::operator delete(p); }
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virtual ~AliasedHasOpNewDelSize() = default;
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};
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struct PyAliasedHasOpNewDelSize : AliasedHasOpNewDelSize {
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PyAliasedHasOpNewDelSize() = default;
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PyAliasedHasOpNewDelSize(int) { }
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std::uint64_t j;
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};
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struct HasOpNewDelBoth {
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std::uint32_t i[8];
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static void *operator new(size_t s) { py::print("D new", s); return ::operator new(s); }
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static void *operator new(size_t s, void *ptr) { py::print("D placement-new", s); return ptr; }
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static void operator delete(void *p) { py::print("D delete"); return ::operator delete(p); }
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static void operator delete(void *p, size_t s) { py::print("D wrong delete", s); return ::operator delete(p); }
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};
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py::class_<HasOpNewDel>(m, "HasOpNewDel").def(py::init<>());
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py::class_<HasOpNewDelSize>(m, "HasOpNewDelSize").def(py::init<>());
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py::class_<HasOpNewDelBoth>(m, "HasOpNewDelBoth").def(py::init<>());
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py::class_<AliasedHasOpNewDelSize, PyAliasedHasOpNewDelSize> aliased(m, "AliasedHasOpNewDelSize");
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aliased.def(py::init<>());
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aliased.attr("size_noalias") = py::int_(sizeof(AliasedHasOpNewDelSize));
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aliased.attr("size_alias") = py::int_(sizeof(PyAliasedHasOpNewDelSize));
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// This test is actually part of test_local_bindings (test_duplicate_local), but we need a
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// definition in a different compilation unit within the same module:
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bind_local<LocalExternal, 17>(m, "LocalExternal", py::module_local());
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// test_bind_protected_functions
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class ProtectedA {
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protected:
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int foo() const { return value; }
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private:
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int value = 42;
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};
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class PublicistA : public ProtectedA {
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public:
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using ProtectedA::foo;
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};
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py::class_<ProtectedA>(m, "ProtectedA")
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.def(py::init<>())
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#if !defined(_MSC_VER) || _MSC_VER >= 1910
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.def("foo", &PublicistA::foo);
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#else
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.def("foo", static_cast<int (ProtectedA::*)() const>(&PublicistA::foo));
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#endif
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class ProtectedB {
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public:
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virtual ~ProtectedB() = default;
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protected:
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virtual int foo() const { return value; }
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private:
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int value = 42;
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};
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class TrampolineB : public ProtectedB {
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public:
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int foo() const override { PYBIND11_OVERLOAD(int, ProtectedB, foo, ); }
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};
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class PublicistB : public ProtectedB {
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public:
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using ProtectedB::foo;
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};
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py::class_<ProtectedB, TrampolineB>(m, "ProtectedB")
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.def(py::init<>())
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#if !defined(_MSC_VER) || _MSC_VER >= 1910
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.def("foo", &PublicistB::foo);
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#else
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.def("foo", static_cast<int (ProtectedB::*)() const>(&PublicistB::foo));
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#endif
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// test_brace_initialization
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struct BraceInitialization {
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int field1;
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std::string field2;
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};
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py::class_<BraceInitialization>(m, "BraceInitialization")
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.def(py::init<int, const std::string &>())
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.def_readwrite("field1", &BraceInitialization::field1)
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.def_readwrite("field2", &BraceInitialization::field2);
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// We *don't* want to construct using braces when the given constructor argument maps to a
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// constructor, because brace initialization could go to the wrong place (in particular when
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// there is also an `initializer_list<T>`-accept constructor):
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py::class_<NoBraceInitialization>(m, "NoBraceInitialization")
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.def(py::init<std::vector<int>>())
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.def_readonly("vec", &NoBraceInitialization::vec);
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// test_reentrant_implicit_conversion_failure
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// #1035: issue with runaway reentrant implicit conversion
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struct BogusImplicitConversion {
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BogusImplicitConversion(const BogusImplicitConversion &) { }
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};
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py::class_<BogusImplicitConversion>(m, "BogusImplicitConversion")
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.def(py::init<const BogusImplicitConversion &>());
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py::implicitly_convertible<int, BogusImplicitConversion>();
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// test_qualname
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// #1166: nested class docstring doesn't show nested name
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// Also related: tests that __qualname__ is set properly
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struct NestBase {};
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struct Nested {};
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py::class_<NestBase> base(m, "NestBase");
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base.def(py::init<>());
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py::class_<Nested>(base, "Nested")
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.def(py::init<>())
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.def("fn", [](Nested &, int, NestBase &, Nested &) {})
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.def("fa", [](Nested &, int, NestBase &, Nested &) {},
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"a"_a, "b"_a, "c"_a);
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base.def("g", [](NestBase &, Nested &) {});
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base.def("h", []() { return NestBase(); });
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// test_error_after_conversion
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// The second-pass path through dispatcher() previously didn't
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// remember which overload was used, and would crash trying to
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// generate a useful error message
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struct NotRegistered {};
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struct StringWrapper { std::string str; };
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m.def("test_error_after_conversions", [](int) {});
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m.def("test_error_after_conversions",
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[](StringWrapper) -> NotRegistered { return {}; });
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py::class_<StringWrapper>(m, "StringWrapper").def(py::init<std::string>());
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py::implicitly_convertible<std::string, StringWrapper>();
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#if defined(PYBIND11_CPP17)
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struct alignas(1024) Aligned {
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std::uintptr_t ptr() const { return (uintptr_t) this; }
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};
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py::class_<Aligned>(m, "Aligned")
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.def(py::init<>())
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.def("ptr", &Aligned::ptr);
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#endif
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}
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template <int N> class BreaksBase { public: virtual ~BreaksBase() = default; };
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template <int N> class BreaksTramp : public BreaksBase<N> {};
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// These should all compile just fine:
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typedef py::class_<BreaksBase<1>, std::unique_ptr<BreaksBase<1>>, BreaksTramp<1>> DoesntBreak1;
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typedef py::class_<BreaksBase<2>, BreaksTramp<2>, std::unique_ptr<BreaksBase<2>>> DoesntBreak2;
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typedef py::class_<BreaksBase<3>, std::unique_ptr<BreaksBase<3>>> DoesntBreak3;
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typedef py::class_<BreaksBase<4>, BreaksTramp<4>> DoesntBreak4;
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typedef py::class_<BreaksBase<5>> DoesntBreak5;
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typedef py::class_<BreaksBase<6>, std::shared_ptr<BreaksBase<6>>, BreaksTramp<6>> DoesntBreak6;
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typedef py::class_<BreaksBase<7>, BreaksTramp<7>, std::shared_ptr<BreaksBase<7>>> DoesntBreak7;
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typedef py::class_<BreaksBase<8>, std::shared_ptr<BreaksBase<8>>> DoesntBreak8;
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#define CHECK_BASE(N) static_assert(std::is_same<typename DoesntBreak##N::type, BreaksBase<N>>::value, \
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"DoesntBreak" #N " has wrong type!")
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CHECK_BASE(1); CHECK_BASE(2); CHECK_BASE(3); CHECK_BASE(4); CHECK_BASE(5); CHECK_BASE(6); CHECK_BASE(7); CHECK_BASE(8);
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#define CHECK_ALIAS(N) static_assert(DoesntBreak##N::has_alias && std::is_same<typename DoesntBreak##N::type_alias, BreaksTramp<N>>::value, \
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"DoesntBreak" #N " has wrong type_alias!")
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#define CHECK_NOALIAS(N) static_assert(!DoesntBreak##N::has_alias && std::is_void<typename DoesntBreak##N::type_alias>::value, \
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"DoesntBreak" #N " has type alias, but shouldn't!")
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CHECK_ALIAS(1); CHECK_ALIAS(2); CHECK_NOALIAS(3); CHECK_ALIAS(4); CHECK_NOALIAS(5); CHECK_ALIAS(6); CHECK_ALIAS(7); CHECK_NOALIAS(8);
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#define CHECK_HOLDER(N, TYPE) static_assert(std::is_same<typename DoesntBreak##N::holder_type, std::TYPE##_ptr<BreaksBase<N>>>::value, \
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"DoesntBreak" #N " has wrong holder_type!")
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CHECK_HOLDER(1, unique); CHECK_HOLDER(2, unique); CHECK_HOLDER(3, unique); CHECK_HOLDER(4, unique); CHECK_HOLDER(5, unique);
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CHECK_HOLDER(6, shared); CHECK_HOLDER(7, shared); CHECK_HOLDER(8, shared);
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// There's no nice way to test that these fail because they fail to compile; leave them here,
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// though, so that they can be manually tested by uncommenting them (and seeing that compilation
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// failures occurs).
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// We have to actually look into the type: the typedef alone isn't enough to instantiate the type:
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#define CHECK_BROKEN(N) static_assert(std::is_same<typename Breaks##N::type, BreaksBase<-N>>::value, \
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"Breaks1 has wrong type!");
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//// Two holder classes:
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//typedef py::class_<BreaksBase<-1>, std::unique_ptr<BreaksBase<-1>>, std::unique_ptr<BreaksBase<-1>>> Breaks1;
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//CHECK_BROKEN(1);
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//// Two aliases:
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//typedef py::class_<BreaksBase<-2>, BreaksTramp<-2>, BreaksTramp<-2>> Breaks2;
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//CHECK_BROKEN(2);
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//// Holder + 2 aliases
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//typedef py::class_<BreaksBase<-3>, std::unique_ptr<BreaksBase<-3>>, BreaksTramp<-3>, BreaksTramp<-3>> Breaks3;
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//CHECK_BROKEN(3);
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//// Alias + 2 holders
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//typedef py::class_<BreaksBase<-4>, std::unique_ptr<BreaksBase<-4>>, BreaksTramp<-4>, std::shared_ptr<BreaksBase<-4>>> Breaks4;
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//CHECK_BROKEN(4);
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//// Invalid option (not a subclass or holder)
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//typedef py::class_<BreaksBase<-5>, BreaksTramp<-4>> Breaks5;
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//CHECK_BROKEN(5);
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//// Invalid option: multiple inheritance not supported:
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//template <> struct BreaksBase<-8> : BreaksBase<-6>, BreaksBase<-7> {};
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//typedef py::class_<BreaksBase<-8>, BreaksBase<-6>, BreaksBase<-7>> Breaks8;
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//CHECK_BROKEN(8);
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