#pragma once
#include <memory>
#include "Test.hpp"
namespace smart_pointer {
class exception : std::exception {
using base_class = std::exception;
using base_class::base_class;
};
template<typename T, typename Allocator>
class SmartPointer {
ENABLE_CLASS_TESTS;
public:
using value_type = T;
explicit SmartPointer(value_type* ptr = nullptr) {
if (ptr == nullptr) {
this->core = nullptr;
} else {
this->core = new Core();
this->core->ptr = ptr;
this->core->count = 1;
}
}
~SmartPointer() {
if (this->core != nullptr && this->core->count == 1) {
delete this->core;
}
}
SmartPointer(const SmartPointer& obj) {
this->core = obj.core;
if (obj.core != nullptr) {
this->core->count++;
}
}
SmartPointer(SmartPointer&& dyingObj) {
this->core = dyingObj.core;
dyingObj.core = nullptr;
}
SmartPointer& operator=(const SmartPointer& other) {
if (this->core != nullptr && this->core->count == 1) {
delete this->core;
}
this->core = other.core;
if (other.core != nullptr) {
this->core->count++;
}
return *this;
}
SmartPointer& operator=(SmartPointer&& dyingObj) {
if (this->core != nullptr) {
delete this->core;
}
this->core = dyingObj.core;
dyingObj.core = nullptr;
return *this;
}
SmartPointer& operator=(value_type* other) {
if (this->core != nullptr && this->core->count == 1) {
delete this->core;
}
if (other != nullptr) {
this->core = new Core();
this->core->ptr = other;
this->core->count = 1;
} else {
this->core = nullptr;
}
return *this;
}
value_type& operator*() {
if (this->core == nullptr) {
throw smart_pointer::exception();
} else {
return *this->core->ptr;
}
}
const value_type& operator*() const {
if (this->core == nullptr) {
throw smart_pointer::exception();
} else {
return *this->core->ptr;
}
}
value_type* operator->() const {
if (this->core != nullptr) {
return this->core->ptr;
} else {
return nullptr;
}
}
value_type* get() const {
if (this->core != nullptr) {
return this->core->ptr;
} else {
return nullptr;
}
}
operator bool() const {
return this->core != nullptr;
}
template<typename U, typename AnotherAllocator>
bool operator==(const SmartPointer<U, AnotherAllocator>& ptr) const {
return static_cast<void*>(this->get()) == static_cast<void*>
(ptr.get());
}
template<typename U, typename AnotherAllocator>
bool operator!=(const SmartPointer<U, AnotherAllocator>& ptr) const {
return static_cast<void*>(this->get()) != static_cast<void*>
(ptr.get());
}
std::size_t count_owners() const {
if (this->core != nullptr) {
return this->core->count;
} else {
return 0;
}
}
private:
class Core {
public:
size_t count;
value_type* ptr;
~Core() {
Allocator del;
del.deallocate(ptr, sizeof(value_type));
this->ptr = nullptr;
}
};
Core* core;
};
} // namespace smart_pointer