mirror of
https://github.com/pybind/pybind11.git
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484 lines
20 KiB
C++
484 lines
20 KiB
C++
/*
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tests/test_smart_ptr.cpp -- binding classes with custom reference counting,
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implicit conversions between types
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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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#if defined(_MSC_VER) && _MSC_VER < 1910 // VS 2015's MSVC
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# pragma warning(disable: 4702) // unreachable code in system header (xatomic.h(382))
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#endif
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#include "pybind11_tests.h"
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#include "object.h"
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namespace {
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// This is just a wrapper around unique_ptr, but with extra fields to deliberately bloat up the
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// holder size to trigger the non-simple-layout internal instance layout for single inheritance with
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// large holder type:
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template <typename T> class huge_unique_ptr {
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std::unique_ptr<T> ptr;
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uint64_t padding[10];
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public:
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huge_unique_ptr(T *p) : ptr(p) {}
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T *get() { return ptr.get(); }
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};
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// Simple custom holder that works like unique_ptr
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template <typename T>
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class custom_unique_ptr {
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std::unique_ptr<T> impl;
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public:
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custom_unique_ptr(T* p) : impl(p) { }
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T* get() const { return impl.get(); }
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T* release_ptr() { return impl.release(); }
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};
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// Simple custom holder that works like shared_ptr and has operator& overload
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// To obtain address of an instance of this holder pybind should use std::addressof
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// Attempt to get address via operator& may leads to segmentation fault
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template <typename T>
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class shared_ptr_with_addressof_operator {
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std::shared_ptr<T> impl;
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public:
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shared_ptr_with_addressof_operator( ) = default;
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shared_ptr_with_addressof_operator(T* p) : impl(p) { }
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T* get() const { return impl.get(); }
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T** operator&() { throw std::logic_error("Call of overloaded operator& is not expected"); }
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};
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// Simple custom holder that works like unique_ptr and has operator& overload
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// To obtain address of an instance of this holder pybind should use std::addressof
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// Attempt to get address via operator& may leads to segmentation fault
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template <typename T>
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class unique_ptr_with_addressof_operator {
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std::unique_ptr<T> impl;
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public:
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unique_ptr_with_addressof_operator() = default;
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unique_ptr_with_addressof_operator(T* p) : impl(p) { }
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T* get() const { return impl.get(); }
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T* release_ptr() { return impl.release(); }
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T** operator&() { throw std::logic_error("Call of overloaded operator& is not expected"); }
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};
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// Custom object with builtin reference counting (see 'object.h' for the implementation)
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class MyObject1 : public Object {
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public:
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MyObject1(int value) : value(value) { print_created(this, toString()); }
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std::string toString() const override { return "MyObject1[" + std::to_string(value) + "]"; }
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protected:
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~MyObject1() override { print_destroyed(this); }
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private:
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int value;
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};
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// Object managed by a std::shared_ptr<>
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class MyObject2 {
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public:
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MyObject2(const MyObject2 &) = default;
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MyObject2(int value) : value(value) { print_created(this, toString()); }
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std::string toString() const { return "MyObject2[" + std::to_string(value) + "]"; }
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virtual ~MyObject2() { print_destroyed(this); }
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private:
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int value;
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};
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// Object managed by a std::shared_ptr<>, additionally derives from std::enable_shared_from_this<>
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class MyObject3 : public std::enable_shared_from_this<MyObject3> {
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public:
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MyObject3(const MyObject3 &) = default;
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MyObject3(int value) : value(value) { print_created(this, toString()); }
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std::string toString() const { return "MyObject3[" + std::to_string(value) + "]"; }
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virtual ~MyObject3() { print_destroyed(this); }
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private:
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int value;
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};
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// test_unique_nodelete
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// Object with a private destructor
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class MyObject4;
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static std::unordered_set<MyObject4 *> myobject4_instances;
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class MyObject4 {
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public:
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MyObject4(int value) : value{value} {
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print_created(this);
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myobject4_instances.insert(this);
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}
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int value;
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static void cleanupAllInstances() {
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auto tmp = std::move(myobject4_instances);
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myobject4_instances.clear();
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for (auto o : tmp)
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delete o;
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}
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private:
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~MyObject4() {
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myobject4_instances.erase(this);
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print_destroyed(this);
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}
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};
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// test_unique_deleter
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// Object with std::unique_ptr<T, D> where D is not matching the base class
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// Object with a protected destructor
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class MyObject4a;
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static std::unordered_set<MyObject4a *> myobject4a_instances;
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class MyObject4a {
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public:
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MyObject4a(int i) {
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value = i;
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print_created(this);
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myobject4a_instances.insert(this);
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};
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int value;
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static void cleanupAllInstances() {
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auto tmp = std::move(myobject4a_instances);
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myobject4a_instances.clear();
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for (auto o : tmp)
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delete o;
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}
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protected:
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virtual ~MyObject4a() {
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myobject4a_instances.erase(this);
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print_destroyed(this);
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}
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};
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// Object derived but with public destructor and no Deleter in default holder
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class MyObject4b : public MyObject4a {
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public:
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MyObject4b(int i) : MyObject4a(i) { print_created(this); }
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~MyObject4b() override { print_destroyed(this); }
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};
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// test_large_holder
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class MyObject5 { // managed by huge_unique_ptr
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public:
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MyObject5(int value) : value{value} { print_created(this); }
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~MyObject5() { print_destroyed(this); }
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int value;
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};
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// test_shared_ptr_and_references
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struct SharedPtrRef {
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struct A {
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A() { print_created(this); }
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A(const A &) { print_copy_created(this); }
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A(A &&) noexcept { print_move_created(this); }
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~A() { print_destroyed(this); }
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};
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A value = {};
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std::shared_ptr<A> shared = std::make_shared<A>();
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};
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// test_shared_ptr_from_this_and_references
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struct SharedFromThisRef {
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struct B : std::enable_shared_from_this<B> {
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B() { print_created(this); }
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B(const B &) : std::enable_shared_from_this<B>() { print_copy_created(this); }
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B(B &&) noexcept : std::enable_shared_from_this<B>() { print_move_created(this); }
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~B() { print_destroyed(this); }
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};
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B value = {};
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std::shared_ptr<B> shared = std::make_shared<B>();
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};
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// Issue #865: shared_from_this doesn't work with virtual inheritance
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struct SharedFromThisVBase : std::enable_shared_from_this<SharedFromThisVBase> {
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SharedFromThisVBase() = default;
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SharedFromThisVBase(const SharedFromThisVBase &) = default;
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virtual ~SharedFromThisVBase() = default;
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};
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struct SharedFromThisVirt : virtual SharedFromThisVBase {};
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// test_move_only_holder
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struct C {
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C() { print_created(this); }
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~C() { print_destroyed(this); }
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};
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// test_holder_with_addressof_operator
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struct TypeForHolderWithAddressOf {
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TypeForHolderWithAddressOf() { print_created(this); }
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TypeForHolderWithAddressOf(const TypeForHolderWithAddressOf &) { print_copy_created(this); }
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TypeForHolderWithAddressOf(TypeForHolderWithAddressOf &&) noexcept {
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print_move_created(this);
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}
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~TypeForHolderWithAddressOf() { print_destroyed(this); }
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std::string toString() const {
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return "TypeForHolderWithAddressOf[" + std::to_string(value) + "]";
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}
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int value = 42;
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};
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// test_move_only_holder_with_addressof_operator
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struct TypeForMoveOnlyHolderWithAddressOf {
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TypeForMoveOnlyHolderWithAddressOf(int value) : value{value} { print_created(this); }
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~TypeForMoveOnlyHolderWithAddressOf() { print_destroyed(this); }
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std::string toString() const {
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return "MoveOnlyHolderWithAddressOf[" + std::to_string(value) + "]";
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}
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int value;
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};
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// test_smart_ptr_from_default
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struct HeldByDefaultHolder { };
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// test_shared_ptr_gc
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// #187: issue involving std::shared_ptr<> return value policy & garbage collection
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struct ElementBase {
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virtual ~ElementBase() = default; /* Force creation of virtual table */
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ElementBase() = default;
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ElementBase(const ElementBase&) = delete;
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};
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struct ElementA : ElementBase {
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ElementA(int v) : v(v) { }
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int value() const { return v; }
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int v;
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};
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struct ElementList {
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void add(const std::shared_ptr<ElementBase> &e) { l.push_back(e); }
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std::vector<std::shared_ptr<ElementBase>> l;
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};
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} // namespace
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// ref<T> is a wrapper for 'Object' which uses intrusive reference counting
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// It is always possible to construct a ref<T> from an Object* pointer without
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// possible inconsistencies, hence the 'true' argument at the end.
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// Make pybind11 aware of the non-standard getter member function
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namespace pybind11 { namespace detail {
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template <typename T>
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struct holder_helper<ref<T>> {
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static const T *get(const ref<T> &p) { return p.get_ptr(); }
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};
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} // namespace detail
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} // namespace pybind11
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// Make pybind aware of the ref-counted wrapper type (s):
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PYBIND11_DECLARE_HOLDER_TYPE(T, ref<T>, true);
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// The following is not required anymore for std::shared_ptr, but it should compile without error:
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PYBIND11_DECLARE_HOLDER_TYPE(T, std::shared_ptr<T>);
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PYBIND11_DECLARE_HOLDER_TYPE(T, huge_unique_ptr<T>);
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PYBIND11_DECLARE_HOLDER_TYPE(T, custom_unique_ptr<T>);
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PYBIND11_DECLARE_HOLDER_TYPE(T, shared_ptr_with_addressof_operator<T>);
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PYBIND11_DECLARE_HOLDER_TYPE(T, unique_ptr_with_addressof_operator<T>);
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PYBIND11_TYPE_CASTER_BASE_HOLDER(Object, ref<Object>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(MyObject1, ref<MyObject1>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(MyObject2, std::shared_ptr<MyObject2>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(MyObject3, std::shared_ptr<MyObject3>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(MyObject4, std::unique_ptr<MyObject4, py::nodelete>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(MyObject4a, std::unique_ptr<MyObject4a, py::nodelete>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(MyObject4b, std::unique_ptr<MyObject4b>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(MyObject5, huge_unique_ptr<MyObject5>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(SharedPtrRef::A, std::shared_ptr<SharedPtrRef::A>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(SharedPtrRef, std::unique_ptr<SharedPtrRef>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(SharedFromThisRef::B, std::shared_ptr<SharedFromThisRef::B>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(SharedFromThisRef, std::unique_ptr<SharedFromThisRef>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(SharedFromThisVirt, std::shared_ptr<SharedFromThisVirt>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(C, custom_unique_ptr<C>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(TypeForHolderWithAddressOf, shared_ptr_with_addressof_operator<TypeForHolderWithAddressOf>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(TypeForMoveOnlyHolderWithAddressOf, unique_ptr_with_addressof_operator<TypeForMoveOnlyHolderWithAddressOf>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(HeldByDefaultHolder, std::unique_ptr<HeldByDefaultHolder>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(ElementBase, std::shared_ptr<ElementBase>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(ElementA, std::shared_ptr<ElementA>)
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PYBIND11_TYPE_CASTER_BASE_HOLDER(ElementList, std::shared_ptr<ElementList>)
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#ifdef PYBIND11_USE_SMART_HOLDER_AS_DEFAULT
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// To prevent triggering a static_assert in the smart_holder code.
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// This is a very special case, because the associated test exercises a holder mismatch.
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namespace pybind11 { namespace detail {
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template <>
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class type_caster<std::shared_ptr<HeldByDefaultHolder>>
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: public copyable_holder_caster<HeldByDefaultHolder, std::shared_ptr<HeldByDefaultHolder>> {};
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} // namespace detail
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} // namespace pybind11
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#endif
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TEST_SUBMODULE(smart_ptr, m) {
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// Please do not interleave `struct` and `class` definitions with bindings code,
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// but implement `struct`s and `class`es in the anonymous namespace above.
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// This helps keeping the smart_holder branch in sync with master.
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// test_smart_ptr
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// Object implementation in `object.h`
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py::class_<Object, ref<Object>> obj(m, "Object");
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obj.def("getRefCount", &Object::getRefCount);
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py::class_<MyObject1, ref<MyObject1>>(m, "MyObject1", obj)
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.def(py::init<int>());
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py::implicitly_convertible<py::int_, MyObject1>();
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m.def("make_object_1", []() -> Object * { return new MyObject1(1); });
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m.def("make_object_2", []() -> ref<Object> { return new MyObject1(2); });
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m.def("make_myobject1_1", []() -> MyObject1 * { return new MyObject1(4); });
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m.def("make_myobject1_2", []() -> ref<MyObject1> { return new MyObject1(5); });
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m.def("print_object_1", [](const Object *obj) { py::print(obj->toString()); });
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m.def("print_object_2", [](ref<Object> obj) { py::print(obj->toString()); });
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m.def("print_object_3", [](const ref<Object> &obj) { py::print(obj->toString()); });
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m.def("print_object_4", [](const ref<Object> *obj) { py::print((*obj)->toString()); });
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m.def("print_myobject1_1", [](const MyObject1 *obj) { py::print(obj->toString()); });
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m.def("print_myobject1_2", [](ref<MyObject1> obj) { py::print(obj->toString()); });
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m.def("print_myobject1_3", [](const ref<MyObject1> &obj) { py::print(obj->toString()); });
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m.def("print_myobject1_4", [](const ref<MyObject1> *obj) { py::print((*obj)->toString()); });
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// Expose constructor stats for the ref type
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m.def("cstats_ref", &ConstructorStats::get<ref_tag>);
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py::class_<MyObject2, std::shared_ptr<MyObject2>>(m, "MyObject2")
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.def(py::init<int>());
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m.def("make_myobject2_1", []() { return new MyObject2(6); });
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m.def("make_myobject2_2", []() { return std::make_shared<MyObject2>(7); });
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m.def("print_myobject2_1", [](const MyObject2 *obj) { py::print(obj->toString()); });
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// NOLINTNEXTLINE(performance-unnecessary-value-param)
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m.def("print_myobject2_2", [](std::shared_ptr<MyObject2> obj) { py::print(obj->toString()); });
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m.def("print_myobject2_3", [](const std::shared_ptr<MyObject2> &obj) { py::print(obj->toString()); });
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m.def("print_myobject2_4", [](const std::shared_ptr<MyObject2> *obj) { py::print((*obj)->toString()); });
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py::class_<MyObject3, std::shared_ptr<MyObject3>>(m, "MyObject3")
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.def(py::init<int>());
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m.def("make_myobject3_1", []() { return new MyObject3(8); });
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m.def("make_myobject3_2", []() { return std::make_shared<MyObject3>(9); });
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m.def("print_myobject3_1", [](const MyObject3 *obj) { py::print(obj->toString()); });
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// NOLINTNEXTLINE(performance-unnecessary-value-param)
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m.def("print_myobject3_2", [](std::shared_ptr<MyObject3> obj) { py::print(obj->toString()); });
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m.def("print_myobject3_3", [](const std::shared_ptr<MyObject3> &obj) { py::print(obj->toString()); });
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m.def("print_myobject3_4", [](const std::shared_ptr<MyObject3> *obj) { py::print((*obj)->toString()); });
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// test_smart_ptr_refcounting
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m.def("test_object1_refcounting", []() {
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ref<MyObject1> o = new MyObject1(0);
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bool good = o->getRefCount() == 1;
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py::object o2 = py::cast(o, py::return_value_policy::reference);
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// always request (partial) ownership for objects with intrusive
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// reference counting even when using the 'reference' RVP
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good &= o->getRefCount() == 2;
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return good;
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});
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// test_unique_nodelete
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py::class_<MyObject4, std::unique_ptr<MyObject4, py::nodelete>>(m, "MyObject4")
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.def(py::init<int>())
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.def_readwrite("value", &MyObject4::value)
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.def_static("cleanup_all_instances", &MyObject4::cleanupAllInstances);
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// test_unique_deleter
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py::class_<MyObject4a, std::unique_ptr<MyObject4a, py::nodelete>>(m, "MyObject4a")
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.def(py::init<int>())
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.def_readwrite("value", &MyObject4a::value)
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.def_static("cleanup_all_instances", &MyObject4a::cleanupAllInstances);
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py::class_<MyObject4b, MyObject4a, std::unique_ptr<MyObject4b>>(m, "MyObject4b")
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.def(py::init<int>());
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// test_large_holder
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py::class_<MyObject5, huge_unique_ptr<MyObject5>>(m, "MyObject5")
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.def(py::init<int>())
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.def_readwrite("value", &MyObject5::value);
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// test_shared_ptr_and_references
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using A = SharedPtrRef::A;
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py::class_<A, std::shared_ptr<A>>(m, "A");
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py::class_<SharedPtrRef, std::unique_ptr<SharedPtrRef>>(m, "SharedPtrRef")
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.def(py::init<>())
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.def_readonly("ref", &SharedPtrRef::value)
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.def_property_readonly(
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"copy", [](const SharedPtrRef &s) { return s.value; }, py::return_value_policy::copy)
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.def_readonly("holder_ref", &SharedPtrRef::shared)
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.def_property_readonly(
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"holder_copy",
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[](const SharedPtrRef &s) { return s.shared; },
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py::return_value_policy::copy)
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.def("set_ref", [](SharedPtrRef &, const A &) { return true; })
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// NOLINTNEXTLINE(performance-unnecessary-value-param)
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.def("set_holder", [](SharedPtrRef &, std::shared_ptr<A>) { return true; });
|
|
|
|
// test_shared_ptr_from_this_and_references
|
|
using B = SharedFromThisRef::B;
|
|
py::class_<B, std::shared_ptr<B>>(m, "B");
|
|
py::class_<SharedFromThisRef, std::unique_ptr<SharedFromThisRef>>(m, "SharedFromThisRef")
|
|
.def(py::init<>())
|
|
.def_readonly("bad_wp", &SharedFromThisRef::value)
|
|
.def_property_readonly("ref",
|
|
[](const SharedFromThisRef &s) -> const B & { return *s.shared; })
|
|
.def_property_readonly(
|
|
"copy",
|
|
[](const SharedFromThisRef &s) { return s.value; },
|
|
py::return_value_policy::copy)
|
|
.def_readonly("holder_ref", &SharedFromThisRef::shared)
|
|
.def_property_readonly(
|
|
"holder_copy",
|
|
[](const SharedFromThisRef &s) { return s.shared; },
|
|
py::return_value_policy::copy)
|
|
.def("set_ref", [](SharedFromThisRef &, const B &) { return true; })
|
|
// NOLINTNEXTLINE(performance-unnecessary-value-param)
|
|
.def("set_holder", [](SharedFromThisRef &, std::shared_ptr<B>) { return true; });
|
|
|
|
// Issue #865: shared_from_this doesn't work with virtual inheritance
|
|
static std::shared_ptr<SharedFromThisVirt> sft(new SharedFromThisVirt());
|
|
py::class_<SharedFromThisVirt, std::shared_ptr<SharedFromThisVirt>>(m, "SharedFromThisVirt")
|
|
.def_static("get", []() { return sft.get(); });
|
|
|
|
// test_move_only_holder
|
|
py::class_<C, custom_unique_ptr<C>>(m, "TypeWithMoveOnlyHolder")
|
|
.def_static("make", []() { return custom_unique_ptr<C>(new C); })
|
|
.def_static("make_as_object", []() { return py::cast(custom_unique_ptr<C>(new C)); });
|
|
|
|
// test_holder_with_addressof_operator
|
|
using HolderWithAddressOf = shared_ptr_with_addressof_operator<TypeForHolderWithAddressOf>;
|
|
py::class_<TypeForHolderWithAddressOf, HolderWithAddressOf>(m, "TypeForHolderWithAddressOf")
|
|
.def_static("make", []() { return HolderWithAddressOf(new TypeForHolderWithAddressOf); })
|
|
.def("get", [](const HolderWithAddressOf &self) { return self.get(); })
|
|
.def("print_object_1",
|
|
[](const TypeForHolderWithAddressOf *obj) { py::print(obj->toString()); })
|
|
// NOLINTNEXTLINE(performance-unnecessary-value-param)
|
|
.def("print_object_2", [](HolderWithAddressOf obj) { py::print(obj.get()->toString()); })
|
|
.def("print_object_3",
|
|
[](const HolderWithAddressOf &obj) { py::print(obj.get()->toString()); })
|
|
.def("print_object_4",
|
|
[](const HolderWithAddressOf *obj) { py::print((*obj).get()->toString()); });
|
|
|
|
// test_move_only_holder_with_addressof_operator
|
|
using MoveOnlyHolderWithAddressOf = unique_ptr_with_addressof_operator<TypeForMoveOnlyHolderWithAddressOf>;
|
|
py::class_<TypeForMoveOnlyHolderWithAddressOf, MoveOnlyHolderWithAddressOf>(m, "TypeForMoveOnlyHolderWithAddressOf")
|
|
.def_static("make", []() { return MoveOnlyHolderWithAddressOf(new TypeForMoveOnlyHolderWithAddressOf(0)); })
|
|
.def_readwrite("value", &TypeForMoveOnlyHolderWithAddressOf::value)
|
|
.def("print_object", [](const TypeForMoveOnlyHolderWithAddressOf *obj) { py::print(obj->toString()); });
|
|
|
|
// test_smart_ptr_from_default
|
|
py::class_<HeldByDefaultHolder, std::unique_ptr<HeldByDefaultHolder>>(m, "HeldByDefaultHolder")
|
|
.def(py::init<>())
|
|
// NOLINTNEXTLINE(performance-unnecessary-value-param)
|
|
.def_static("load_shared_ptr", [](std::shared_ptr<HeldByDefaultHolder>) {});
|
|
|
|
// test_shared_ptr_gc
|
|
// #187: issue involving std::shared_ptr<> return value policy & garbage collection
|
|
py::class_<ElementBase, std::shared_ptr<ElementBase>>(m, "ElementBase");
|
|
|
|
py::class_<ElementA, ElementBase, std::shared_ptr<ElementA>>(m, "ElementA")
|
|
.def(py::init<int>())
|
|
.def("value", &ElementA::value);
|
|
|
|
py::class_<ElementList, std::shared_ptr<ElementList>>(m, "ElementList")
|
|
.def(py::init<>())
|
|
.def("add", &ElementList::add)
|
|
.def("get", [](ElementList &el) {
|
|
py::list list;
|
|
for (auto &e : el.l)
|
|
list.append(py::cast(e));
|
|
return list;
|
|
});
|
|
}
|