Implement stdext::shared_ptr
It's an alternative to stdext::shared_object_ptr with weak pointers support and some other functionallity, however it's heavier, uses more memory, more allocation and slower, this class should be used when really needed, prefer stdext::shared_object_ptr
This commit is contained in:
Eduardo Bart
parent
bdbe065c23
commit
c452e74e0c
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@ -50,6 +50,7 @@ set(framework_SOURCES ${framework_SOURCES}
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${CMAKE_CURRENT_LIST_DIR}/stdext/packed_storage.h
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${CMAKE_CURRENT_LIST_DIR}/stdext/packed_vector.h
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${CMAKE_CURRENT_LIST_DIR}/stdext/shared_object.h
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${CMAKE_CURRENT_LIST_DIR}/stdext/shared_ptr.h
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${CMAKE_CURRENT_LIST_DIR}/stdext/stdext.h
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${CMAKE_CURRENT_LIST_DIR}/stdext/string.cpp
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${CMAKE_CURRENT_LIST_DIR}/stdext/string.h
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@ -23,6 +23,7 @@
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#ifndef STDEXT_SHARED_OBJECT_H
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#define STDEXT_SHARED_OBJECT_H
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#include "types.h"
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#include <type_traits>
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#include <functional>
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#include <cassert>
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@ -37,16 +38,14 @@ namespace stdext {
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template<class T>
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class shared_object_ptr;
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typedef unsigned long refcount_t;
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class shared_object
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{
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public:
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shared_object() : m_refs(0) { }
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shared_object() : refs(0) { }
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virtual ~shared_object() { }
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void add_ref() { ++m_refs; assert(m_refs != 0xffffffff); }
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void dec_ref() { if(--m_refs == 0) delete this; }
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refcount_t ref_count() { return m_refs; }
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void add_ref() { ++refs; }
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void dec_ref() { if(--refs == 0) delete this; }
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refcount_t ref_count() { return refs; }
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template<typename T> stdext::shared_object_ptr<T> static_self_cast() { return stdext::shared_object_ptr<T>(static_cast<T*>(this)); }
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template<typename T> stdext::shared_object_ptr<T> dynamic_self_cast() { return stdext::shared_object_ptr<T>(dynamic_cast<T*>(this)); }
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@ -54,9 +53,9 @@ public:
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private:
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#ifdef THREAD_SAFE
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std::atomic<refcount_t> m_refs;
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std::atomic<refcount_t> refs;
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#else
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refcount_t m_refs;
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refcount_t refs;
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#endif
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};
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@ -78,7 +77,7 @@ public:
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~shared_object_ptr() { if(px != nullptr) dec_ref(); }
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void reset() { shared_object_ptr().swap(*this); }
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void reset(T* rhs) { shared_object_ptr( rhs ).swap(*this); }
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void reset(T* rhs) { shared_object_ptr(rhs).swap(*this); }
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void swap(shared_object_ptr& rhs) { std::swap(px, rhs.px); }
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T* get() const { return px; }
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@ -0,0 +1,232 @@
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/*
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* Copyright (c) 2010-2013 OTClient <https://github.com/edubart/otclient>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef STDEXT_SHARED_PTR_H
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#define STDEXT_SHARED_PTR_H
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#include "types.h"
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#include "dumper.h"
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#include <type_traits>
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#include <functional>
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#include <cassert>
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#include <ostream>
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#ifdef THREAD_SAFE
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#include <atomic>
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#endif
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namespace stdext {
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template<class T>
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class shared_ptr;
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template<class T>
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class weak_ptr;
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template<class T>
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class shared_base
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{
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public:
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shared_base(T* p) : refs(1), weaks(0), px(p) { }
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~shared_base() { }
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void add_ref() { ++refs; }
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void dec_ref() {
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if(--refs == 0) {
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delete px;
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px = nullptr;
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if(weaks == 0)
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delete this;
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}
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}
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void add_weak_ref() { ++weaks; }
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void dec_weak_ref() {
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if(--weaks == 0 && refs == 0)
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delete this;
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}
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void set(T *p) {
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T* tmp = px;
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px = p;
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if(tmp)
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delete tmp;
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}
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T *get() { return px; }
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refcount_t ref_count() { return refs; }
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refcount_t weak_count() { return weaks; }
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bool expired() { return refs == 0; }
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private:
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#ifdef THREAD_SAFE
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std::atomic<refcount_t> refs;
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std::atomic<refcount_t> weaks;
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std::atomic<T*> px;
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#else
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refcount_t refs;
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refcount_t weaks;
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T* px;
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#endif
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};
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template<class T>
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class shared_ptr
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{
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public:
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typedef T element_type;
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shared_ptr() : base(nullptr) { }
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shared_ptr(T* p) { if(p != nullptr) base = new shared_base<T>(p); else base = nullptr; }
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shared_ptr(shared_ptr const& rhs): base(rhs.base) { if(base != nullptr) base->add_ref(); }
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template<class U>
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shared_ptr(shared_ptr<U> const& rhs, typename std::is_convertible<U,T>::type* = nullptr) : base(rhs.base) { if(base != nullptr) base->add_ref(); }
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~shared_ptr() { if(base != nullptr) base->dec_ref(); }
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void reset() { shared_ptr().swap(*this); }
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void reset(T* rhs) { shared_ptr(rhs).swap(*this); }
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void swap(shared_ptr& rhs) { std::swap(base, rhs.base); }
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void set(T* p) { assert(p != nullptr); base->set(p); }
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T* get() const { return base ? base->get() : nullptr; }
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refcount_t use_count() const { return base ? base->ref_count() : 0; }
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refcount_t weak_count() const { return base ? base->weak_count() : 0; }
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bool is_unique() const { return use_count() == 1; }
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T& operator*() const { assert(base != nullptr); return *base->get(); }
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T* operator->() const { assert(base != nullptr); return base->get(); }
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template<class U>
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shared_ptr& operator=(shared_ptr<U> const& rhs) { shared_ptr(rhs).swap(*this); return *this; }
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shared_ptr& operator=(shared_ptr const& rhs) { shared_ptr(rhs).swap(*this); return *this; }
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shared_ptr& operator=(T* rhs) { shared_ptr(rhs).swap(*this); return *this; }
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// implicit conversion to bool
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typedef shared_base<T>* shared_ptr::*unspecified_bool_type;
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operator unspecified_bool_type() const { return base == nullptr ? nullptr : &shared_ptr::base; }
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bool operator!() const { return base == nullptr; }
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// std::move support
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shared_ptr(shared_ptr&& rhs): base(rhs.base) { rhs.base = nullptr; }
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shared_ptr& operator=(shared_ptr&& rhs) { shared_ptr(static_cast<shared_ptr&&>(rhs)).swap(*this); return *this; }
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private:
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shared_ptr(shared_base<T> *base) {
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if(base && !base->expired()) {
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base->add_ref();
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this->base = base;
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} else
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base = nullptr;
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}
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shared_base<T> *base;
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friend class weak_ptr<T>;
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};
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template<class T>
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class weak_ptr {
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public:
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typedef T element_type;
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weak_ptr() : base(nullptr) { }
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weak_ptr(shared_ptr<T> const& rhs): base(rhs.base) { if(base != nullptr) base->add_weak_ref(); }
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template<class U>
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weak_ptr(shared_ptr<U> const& rhs, typename std::is_convertible<U,T>::type* = nullptr) : base(rhs.base) { if(base != nullptr) base->add_weak_ref(); }
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weak_ptr(weak_ptr<T> const& rhs): base(rhs.base) { if(base != nullptr) base->add_weak_ref(); }
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template<class U>
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weak_ptr(weak_ptr<U> const& rhs, typename std::is_convertible<U,T>::type* = nullptr) : base(rhs.base) { if(base != nullptr) base->add_weak_ref(); }
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~weak_ptr() { if(base != nullptr) base->dec_weak_ref(); }
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void reset() { weak_ptr().swap(*this); }
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void swap(weak_ptr& rhs) { std::swap(base, rhs.base); }
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T* get() const { return base ? base->get() : nullptr; }
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refcount_t use_count() const { return base ? base->ref_count() : 0; }
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refcount_t weak_count() const { return base ? base->weak_count() : 0; }
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bool expired() const { return base ? base->expired() : false; }
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shared_ptr<T> lock() { return shared_ptr<T>(base); }
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weak_ptr& operator=(weak_ptr const& rhs) { weak_ptr(rhs).swap(*this); return *this; }
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template<class U>
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weak_ptr& operator=(shared_ptr<U> const& rhs) { weak_ptr(rhs).swap(*this); return *this; }
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template<class U>
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weak_ptr& operator=(weak_ptr<T> const& rhs) { weak_ptr(rhs).swap(*this); return *this; }
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// implicit conversion to bool
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typedef shared_base<T>* weak_ptr::*unspecified_bool_type;
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operator unspecified_bool_type() const { return base == nullptr ? nullptr : &weak_ptr::base; }
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bool operator!() const { return !expired(); }
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// std::move support
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weak_ptr(weak_ptr&& rhs): base(rhs.base) { rhs.base = nullptr; }
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weak_ptr& operator=(weak_ptr&& rhs) { weak_ptr(static_cast<weak_ptr&&>(rhs)).swap(*this); return *this; }
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private:
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shared_base<T> *base;
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};
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template<class T, class U> bool operator==(shared_ptr<T> const& a, shared_ptr<U> const& b) { return a.get() == b.get(); }
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template<class T, class U> bool operator==(weak_ptr<T> const& a, weak_ptr<U> const& b) { return a.get() == b.get(); }
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template<class T, class U> bool operator==(shared_ptr<T> const& a, weak_ptr<U> const& b) { return a.get() == b.get(); }
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template<class T, class U> bool operator==(weak_ptr<T> const& a, shared_ptr<U> const& b) { return a.get() == b.get(); }
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template<class T, class U> bool operator!=(shared_ptr<T> const& a, shared_ptr<U> const& b) { return a.get() != b.get(); }
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template<class T, class U> bool operator!=(weak_ptr<T> const& a, weak_ptr<U> const& b) { return a.get() != b.get(); }
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template<class T, class U> bool operator!=(shared_ptr<T> const& a, weak_ptr<U> const& b) { return a.get() != b.get(); }
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template<class T, class U> bool operator!=(weak_ptr<T> const& a, shared_ptr<U> const& b) { return a.get() != b.get(); }
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template<class T, class U> bool operator==(shared_ptr<T> const& a, U* b) { return a.get() == b; }
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template<class T, class U> bool operator==(weak_ptr<T> const& a, U* b) { return a.get() == b; }
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template<class T, class U> bool operator!=(shared_ptr<T> const& a, U* b) { return a.get() != b; }
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template<class T, class U> bool operator!=(weak_ptr<T> const& a, U* b) { return a.get() != b; }
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template<class T, class U> bool operator==(T * a, shared_ptr<U> const& b) { return a == b.get(); }
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template<class T, class U> bool operator==(T * a, weak_ptr<U> const& b) { return a == b.get(); }
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template<class T, class U> bool operator!=(T * a, shared_ptr<U> const& b) { return a != b.get(); }
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template<class T, class U> bool operator!=(T * a, weak_ptr<U> const& b) { return a != b.get(); }
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template<class T> bool operator<(shared_ptr<T> const& a, shared_ptr<T> const& b) { return std::less<T*>()(a.get(), b.get()); }
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template<class T> bool operator<(weak_ptr<T> const& a, weak_ptr<T> const& b) { return std::less<T*>()(a.get(), b.get()); }
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template<class T> T* get_pointer(shared_ptr<T> const& p) { return p.get(); }
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template<class T> T* get_pointer(weak_ptr<T> const& p) { return p.get(); }
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template<class T, class U> shared_ptr<T> static_pointer_cast(shared_ptr<U> const& p) { return static_cast<T*>(p.get()); }
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template<class T, class U> shared_ptr<T> const_pointer_cast(shared_ptr<U> const& p) { return const_cast<T*>(p.get()); }
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template<class T, class U> shared_ptr<T> dynamic_pointer_cast(shared_ptr<U> const& p) { return dynamic_cast<T*>(p.get()); }
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template<class T, typename... Args> stdext::shared_ptr<T> make_shared(Args... args) { return stdext::shared_ptr<T>(new T(args...)); }
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// operator<< support
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template<class E, class T, class Y> std::basic_ostream<E, T>& operator<<(std::basic_ostream<E, T>& os, shared_ptr<Y> const& p) { os << p.get(); return os; }
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template<class E, class T, class Y> std::basic_ostream<E, T>& operator<<(std::basic_ostream<E, T>& os, weak_ptr<Y> const& p) { os << p.get(); return os; }
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}
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namespace std {
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// hash, for unordered_map support
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template<typename T> struct hash<stdext::shared_ptr<T>> { size_t operator()(const stdext::shared_ptr<T>& p) const { return std::hash<T*>()(p.get()); } };
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template<typename T> struct hash<stdext::weak_ptr<T>> { size_t operator()(const stdext::weak_ptr<T>& p) const { return std::hash<T*>()(p.get()); } };
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// swap support
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template<class T> void swap(stdext::shared_ptr<T>& lhs, stdext::shared_ptr<T>& rhs) { lhs.swap(rhs); }
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template<class T> void swap(stdext::weak_ptr<T>& lhs, stdext::weak_ptr<T>& rhs) { lhs.swap(rhs); }
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}
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#endif
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@ -41,6 +41,7 @@ typedef int16_t int16;
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typedef int8_t int8;
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typedef int64 ticks_t;
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typedef uint_fast32_t refcount_t;
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using std::size_t;
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using std::ptrdiff_t;
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