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Diffstat (limited to 'ext/pybind11/tests/object.h')
-rw-r--r-- | ext/pybind11/tests/object.h | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/ext/pybind11/tests/object.h b/ext/pybind11/tests/object.h new file mode 100644 index 000000000..753f654b2 --- /dev/null +++ b/ext/pybind11/tests/object.h @@ -0,0 +1,175 @@ +#if !defined(__OBJECT_H) +#define __OBJECT_H + +#include <atomic> +#include "constructor_stats.h" + +/// Reference counted object base class +class Object { +public: + /// Default constructor + Object() { print_default_created(this); } + + /// Copy constructor + Object(const Object &) : m_refCount(0) { print_copy_created(this); } + + /// Return the current reference count + int getRefCount() const { return m_refCount; }; + + /// Increase the object's reference count by one + void incRef() const { ++m_refCount; } + + /** \brief Decrease the reference count of + * the object and possibly deallocate it. + * + * The object will automatically be deallocated once + * the reference count reaches zero. + */ + void decRef(bool dealloc = true) const { + --m_refCount; + if (m_refCount == 0 && dealloc) + delete this; + else if (m_refCount < 0) + throw std::runtime_error("Internal error: reference count < 0!"); + } + + virtual std::string toString() const = 0; +protected: + /** \brief Virtual protected deconstructor. + * (Will only be called by \ref ref) + */ + virtual ~Object() { print_destroyed(this); } +private: + mutable std::atomic<int> m_refCount { 0 }; +}; + +// Tag class used to track constructions of ref objects. When we track constructors, below, we +// track and print out the actual class (e.g. ref<MyObject>), and *also* add a fake tracker for +// ref_tag. This lets us check that the total number of ref<Anything> constructors/destructors is +// correct without having to check each individual ref<Whatever> type individually. +class ref_tag {}; + +/** + * \brief Reference counting helper + * + * The \a ref refeference template is a simple wrapper to store a + * pointer to an object. It takes care of increasing and decreasing + * the reference count of the object. When the last reference goes + * out of scope, the associated object will be deallocated. + * + * \ingroup libcore + */ +template <typename T> class ref { +public: + /// Create a nullptr reference + ref() : m_ptr(nullptr) { print_default_created(this); track_default_created((ref_tag*) this); } + + /// Construct a reference from a pointer + ref(T *ptr) : m_ptr(ptr) { + if (m_ptr) ((Object *) m_ptr)->incRef(); + + print_created(this, "from pointer", m_ptr); track_created((ref_tag*) this, "from pointer"); + + } + + /// Copy constructor + ref(const ref &r) : m_ptr(r.m_ptr) { + if (m_ptr) + ((Object *) m_ptr)->incRef(); + + print_copy_created(this, "with pointer", m_ptr); track_copy_created((ref_tag*) this); + } + + /// Move constructor + ref(ref &&r) : m_ptr(r.m_ptr) { + r.m_ptr = nullptr; + + print_move_created(this, "with pointer", m_ptr); track_move_created((ref_tag*) this); + } + + /// Destroy this reference + ~ref() { + if (m_ptr) + ((Object *) m_ptr)->decRef(); + + print_destroyed(this); track_destroyed((ref_tag*) this); + } + + /// Move another reference into the current one + ref& operator=(ref&& r) { + print_move_assigned(this, "pointer", r.m_ptr); track_move_assigned((ref_tag*) this); + + if (*this == r) + return *this; + if (m_ptr) + ((Object *) m_ptr)->decRef(); + m_ptr = r.m_ptr; + r.m_ptr = nullptr; + return *this; + } + + /// Overwrite this reference with another reference + ref& operator=(const ref& r) { + print_copy_assigned(this, "pointer", r.m_ptr); track_copy_assigned((ref_tag*) this); + + if (m_ptr == r.m_ptr) + return *this; + if (m_ptr) + ((Object *) m_ptr)->decRef(); + m_ptr = r.m_ptr; + if (m_ptr) + ((Object *) m_ptr)->incRef(); + return *this; + } + + /// Overwrite this reference with a pointer to another object + ref& operator=(T *ptr) { + print_values(this, "assigned pointer"); track_values((ref_tag*) this, "assigned pointer"); + + if (m_ptr == ptr) + return *this; + if (m_ptr) + ((Object *) m_ptr)->decRef(); + m_ptr = ptr; + if (m_ptr) + ((Object *) m_ptr)->incRef(); + return *this; + } + + /// Compare this reference with another reference + bool operator==(const ref &r) const { return m_ptr == r.m_ptr; } + + /// Compare this reference with another reference + bool operator!=(const ref &r) const { return m_ptr != r.m_ptr; } + + /// Compare this reference with a pointer + bool operator==(const T* ptr) const { return m_ptr == ptr; } + + /// Compare this reference with a pointer + bool operator!=(const T* ptr) const { return m_ptr != ptr; } + + /// Access the object referenced by this reference + T* operator->() { return m_ptr; } + + /// Access the object referenced by this reference + const T* operator->() const { return m_ptr; } + + /// Return a C++ reference to the referenced object + T& operator*() { return *m_ptr; } + + /// Return a const C++ reference to the referenced object + const T& operator*() const { return *m_ptr; } + + /// Return a pointer to the referenced object + operator T* () { return m_ptr; } + + /// Return a const pointer to the referenced object + T* get() { return m_ptr; } + + /// Return a pointer to the referenced object + const T* get() const { return m_ptr; } +private: + T *m_ptr; +}; + +#endif /* __OBJECT_H */ |