SharedPtrTypes.h

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2025 Alex2772 and Contributors
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
#pragma once
 
#include <memory>
#include <functional>
#include <optional>
#include <type_traits>
#include <AUI/Util/Assert.h>
 
class AObject;
 
#ifdef AUI_SHARED_PTR_FIND_INSTANCES
#include <AUI/api.h>
#include <AUI/Util/APimpl.h>
#include <map>
#include <set>
#include <mutex>
#include <AUI/Reflect/AClass.h>
 
class API_AUI_CORE AStacktrace;
 
namespace aui::impl::shared_ptr {
   struct InstancesDict {
       std::recursive_mutex sync;
       std::map<void*, std::set<void*>> map;
   };
 
   API_AUI_CORE InstancesDict& instances() noexcept;
   API_AUI_CORE void printAllInstancesOf(void* ptrToSharedPtr) noexcept;
}
 
#endif
 
template<typename T>
class _;

template<typename T>
struct _weak: public std::weak_ptr<T> {
private:
   using super = std::weak_ptr<T>;
 
public:
   using super::weak_ptr;
 
   _weak(const _weak<T>& v) noexcept: std::weak_ptr<T>(v) {}
   _weak(_weak<T>&& v) noexcept: std::weak_ptr<T>(std::move(v)) {}
   _weak(const std::weak_ptr<T>& v): std::weak_ptr<T>(v) {}
   _weak(std::weak_ptr<T>&& v) noexcept: std::weak_ptr<T>(std::move(v)) {}
 
   _<T> lock() const noexcept {
       return static_cast<_<T>>(super::lock());
   }
 
   _weak& operator=(const std::weak_ptr<T>& v) noexcept {
       super::weak_ptr::operator=(v);
       return *this;
   }
 
   _weak& operator=(std::weak_ptr<T>&& v) noexcept {
       super::weak_ptr::operator=(std::move(v));
       return *this;
   }
 
   _weak& operator=(const _weak<T>& v) noexcept {
       super::weak_ptr::operator=(v);
       return *this;
   }
 
   _weak& operator=(_weak<T>&& v) noexcept {
       super::weak_ptr::operator=(std::move(v));
       return *this;
   }
 
   _weak& operator=(const std::shared_ptr<T>& v) noexcept {
       super::weak_ptr::operator=(v);
       return *this;
   }
 
   _weak& operator=(std::shared_ptr<T>&& v) noexcept {
       super::weak_ptr::operator=(std::move(v));
       return *this;
   }
 
   _weak& operator=(const _<T>& v) noexcept {
       super::weak_ptr::operator=(v);
       return *this;
   }
 
   _weak& operator=(_<T>&& v) noexcept {
       super::weak_ptr::operator=(std::move(v));
       return *this;
   }
};
 
template<typename T, typename Deleter = std::default_delete<T>>
using _unique = std::unique_ptr<T, Deleter>;
 
 
namespace aui {
 
   struct ptr {
       template<typename T, typename Deleter = std::default_delete<T>>
       static _unique<T, Deleter> make_unique_with_deleter(T* ptr, Deleter deleter = Deleter{}) {
           return { ptr, std::move(deleter) };
       }

       template<typename T>
       static _<T> manage(T* raw);

       template<typename T, typename Deleter>
       static _<T> manage(T* raw, Deleter deleter);

       template<typename T>
       static _unique<T> unique(T* raw);

       template<typename T>
       static _<T> fake(T* raw);
   };
}
 

template<typename T>
class _ : public std::shared_ptr<T>
{
   friend struct aui::ptr;
private:
   using super = std::shared_ptr<T>;
 
   _(T* raw, std::nullopt_t): std::shared_ptr<T>(raw) {
 
   }
 
#ifdef AUI_SHARED_PTR_FIND_INSTANCES
   friend API_AUI_CORE void aui::impl::shared_ptr::printAllInstancesOf(void* ptrToSharedPtr) noexcept;
   struct InstanceDescriber;
 
   static AStacktrace makeStacktrace();
 
   struct InstanceDescriber {
       aui::fast_pimpl<AStacktrace, sizeof(std::vector<int>) + 8, alignof(std::vector<int>)> stacktrace;
       _<T>* self;
       T* pointingTo;
 
       InstanceDescriber(_<T>* self): stacktrace(_<T>::makeStacktrace()), self(self), pointingTo(self->get()) {
           if (pointingTo == nullptr) return;
           std::unique_lock lock(aui::impl::shared_ptr::instances().sync);
           aui::impl::shared_ptr::instances().map[pointingTo].insert(self);
           //std::printf("[AUI_SHARED_PTR_FIND_INSTANCES] %s << %p\n", AClass<T>::name().toStdString().c_str(), pointingTo);
       }
 
       InstanceDescriber(const InstanceDescriber&) = delete;
       InstanceDescriber(InstanceDescriber&&) = delete;
 
       ~InstanceDescriber() {
           if (pointingTo == nullptr) return;
           auto& inst = aui::impl::shared_ptr::instances();
           std::unique_lock lock(inst.sync);
           if (auto mapIt = inst.map.find(pointingTo); mapIt != inst.map.end()) {
               auto setIt = mapIt->second.find(self);
               AUI_ASSERT(setIt != mapIt->second.end());
               mapIt->second.erase(setIt);
               if (mapIt->second.empty()) {
                   //inst.map.erase(it);
               }
           }
           //std::printf("[AUI_SHARED_PTR_FIND_INSTANCES] %s >> %p\n", AClass<T>::name().toStdString().c_str(), pointingTo);
       }
   } mInstanceDescriber = this;
 
#endif
 
public:
   using stored_t = T;
 
 
#ifdef AUI_SHARED_PTR_FIND_INSTANCES
   void printAllInstances() {
       aui::impl::shared_ptr::printAllInstancesOf(this);
   }
   void printAllInstances() const {
       const_cast<_<T>&>(*this).printAllInstances();
   }
#endif
 
   using std::shared_ptr<T>::shared_ptr;
 
   _(const std::shared_ptr<T>& v): std::shared_ptr<T>(v) {}
   _(std::shared_ptr<T>&& v) noexcept: std::shared_ptr<T>(std::move(v)) {}
   _(const _& v): std::shared_ptr<T>(v) {}
   _(_&& v) noexcept: std::shared_ptr<T>(std::move(v)) {}
   _(const std::weak_ptr<T>& v): std::shared_ptr<T>(v) {}
   _(const _weak<T>& v): std::shared_ptr<T>(v) {}
 
   _& operator=(const _& rhs) noexcept {
       std::shared_ptr<T>::operator=(rhs);
       return *this;
   }
 
   _& operator=(_&& rhs) noexcept {
       std::shared_ptr<T>::operator=(std::forward<_>(rhs));
       return *this;
   }

   _(T* v) = delete;

   [[nodiscard]]
   _weak<T> weak() const {
       return _weak<T>(*this);
   }
 
   template<typename SignalField, typename Object, typename Function>
   inline _<T>& connect(SignalField signalField, Object object, Function&& function);
 
   template<typename SignalField, typename Function>
   inline _<T>& connect(SignalField signalField, Function&& function);
 
 
   template <typename Functor>
   const _<T>& operator^(Functor&& functor) const {
       functor(*this);
       return *this;
   }

   [[nodiscard]]
   std::add_lvalue_reference_t<T> value() const noexcept {
#if AUI_DEBUG
       AUI_ASSERTX(super::get() != nullptr, "an attempt to dereference a null pointer");
#endif
       return *super::get();
   }

   [[nodiscard]]
   std::add_lvalue_reference_t<T> operator*() const noexcept {
       return value();
   }

   [[nodiscard]]
   std::add_pointer_t<T> operator->() const noexcept {
       return &value();
   }
 
   // forward ranged-for loops
   auto begin() const requires requires(T& t) { t.begin(); } {
       return super::operator->()->begin();
   }
   auto end() const requires requires(T& t) { t.end(); } {
       return super::operator->()->end();
   }
   auto begin() requires requires(T& t) { t.begin(); } {
       return super::operator->()->begin();
   }
   auto end() requires requires(T& t) { t.end(); } {
       return super::operator->()->end();
   }
 
   // operators
 
   template<typename Arg>
   requires requires (T&& l, Arg&& r) { std::forward<T>(l) << std::forward<Arg>(r); }
   const _<T>& operator<<(Arg&& value) const {
       (*super::get()) << std::forward<Arg>(value);
       return *this;
   }
 
   template<typename Arg>
   _<T>& operator<<(Arg&& value) {
       (*super::get()) << std::forward<Arg>(value);
       return *this;
   }
 
   template<typename... Arg>
   auto operator()(Arg&&... value) const requires std::is_invocable_v<T, Arg...> {
       return (*super::get())(std::forward<Arg>(value)...);
   }
 
   template<typename Arg>
   requires requires (T&& l, Arg&& r) { std::forward<T>(l) + std::forward<Arg>(r); }
   const _<T>& operator+(Arg&& value) const {
       (*super::get()) + std::forward<Arg>(value);
       return *this;
   }
 
   template<typename Arg>
   requires requires (T&& l, Arg&& r) { std::forward<T>(l) & std::forward<Arg>(r); }
   const _<T>& operator&(Arg&& value) const {
       (*super::get()) & std::forward<Arg>(value);
       return *this;
   }
 
   template<typename Arg>
   requires requires (T&& l, Arg&& r) { std::forward<T>(l) | std::forward<Arg>(r); }
   const _<T>& operator|(Arg&& value) const {
       (*super::get()) | std::forward<Arg>(value);
       return *this;
   }
 
   template<typename Arg>
   _<T>& operator+(Arg&& value) {
       (*super::get()) + std::forward<Arg>(value);
       return *this;
   }
 
   template<typename Arg>
   const _<T>& operator*(Arg&& value) {
       (*super::get()) * std::forward<Arg>(value);
       return *this;
   }
 
   template<typename Arg>
   requires requires (T&& l, Arg&& r) { std::forward<T>(l) - std::forward<Arg>(r); }
   const _<T>& operator-(Arg&& value) const {
       (*super::get()) - std::forward<Arg>(value);
       return *this;
   }
 
   template<typename Arg>
   _<T>& operator-(Arg&& value) {
       (*super::get()) - std::forward<Arg>(value);
       return *this;
   }
 
   template<typename Arg>
   requires requires (T&& l, Arg&& r) { std::forward<T>(l) >> std::forward<Arg>(r); }
   const _<T>& operator>>(Arg&& value) const {
       (*super::get()) >> std::forward<Arg>(value);
       return *this;
   }
 
   template<typename...Args>
   _<T>& operator()(const Args&... value) {
       (*super::get())(value...);
       return *this;
   }
   template<typename...Args>
   auto operator()(Args&&... value) {
       return (*super::get())(std::forward<Args>(value)...);
   }
};
 
 
namespace aui {
   template<typename T>
   _<T> ptr::manage(T* raw) {
       return _<T>(raw, std::nullopt);
   }
 
   template<typename T>
   _<T> ptr::fake(T* raw) {
       return _<T>(std::shared_ptr<void>{}, raw);
   }
 
   template<typename T, typename Deleter>
   _<T> ptr::manage(T* raw, Deleter deleter) {
       return _<T>(raw, deleter);
   }
   template<typename T>
   _unique<T> ptr::unique(T* raw) {
       return _unique<T>(raw);
   }
}
 
template<typename TO, typename FROM>
inline TO* _cast(const _unique<FROM>& object)
{
   return dynamic_cast<TO*>(object.get());
}
 
template<typename TO, typename FROM>
inline _<TO> _cast(const _<FROM>& object)
{
   return std::dynamic_pointer_cast<TO, FROM>(object);
}
 
template<typename TO, typename FROM>
inline _<TO> _cast(_<FROM>&& object)
{
   return std::dynamic_pointer_cast<TO, FROM>(std::move(object));
}
 
template<typename TO, typename FROM>
inline _<TO> _cast(const std::shared_ptr<FROM>& object)
{
   return std::dynamic_pointer_cast<TO, FROM>(object);
}
 
 
template<typename TO, typename FROM>
inline _<TO> _cast(std::shared_ptr<FROM>&& object)
{
   return std::dynamic_pointer_cast<TO, FROM>(std::move(object));
}
 
 

#define AUI_NULLSAFE(s) if(decltype(auto) _tmp = (s))_tmp

© 2025 AUI Framework Contributors. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. All trademarks are property of their respective owners.