#include <memory>
#include "Test.hpp"
#ifndef SMARTPOINTER_HPP
#define SMARTPOINTER_HPP
using std::size_t;
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* x = nullptr) {
if (x == nullptr) {
this->core = nullptr;
} else {
this->core = new Core();
core->info = x;
core->cnt = 1;
}
}
SmartPointer(const SmartPointer& x) {
this->core = x.core;
if (x.core != nullptr) {
core->cnt++;
}
}
SmartPointer(SmartPointer&& x) {
this->core = x.core;
x.core = nullptr;
}
void remove() {
if (core != nullptr) {
core->cnt -= 1;
if (core->cnt == 0) {
delete (core);
}
}
}
SmartPointer& operator=(const SmartPointer& x) {
remove();
this->core = x.core;
if (x.core != nullptr) {
core->cnt++;
}
return *this;
}
SmartPointer& operator=(SmartPointer&& x) {
remove();
this->core = x.core;
x.core = nullptr;
return *this;
}
SmartPointer& operator=(value_type* x) {
remove();
if (x != nullptr) {
this->core = new Core();
core->info = x;
core->cnt = 1;
} else {
this->core = nullptr;
}
return *this;
}
~SmartPointer() {
remove();
}
value_type& operator*() {
if (core == nullptr) {
throw smart_pointer::exception();
} else {
return *(core->info);
}
}
const value_type& operator*() const {
if (core == nullptr) {
throw smart_pointer::exception();
} else {
return *(core->info);
}
}
value_type* operator->() const {
if (core == nullptr) {
return nullptr;
} else {
return core->info;
}
}
value_type* get() const {
if (core == nullptr) {
return nullptr;
} else {
return core->info;
}
}
operator bool() const {
return core != nullptr;
}
template <typename U, typename AnotherAllocator>
bool operator==(const SmartPointer<U,
AnotherAllocator>& pointer) const {
return static_cast<void*>(this->get()) ==
static_cast<void*>(pointer.get());
}
template <typename U, typename AnotherAllocator>
bool operator!=(const SmartPointer<U,
AnotherAllocator>& pointer) const {
return static_cast<void*>(this->get()) !=
static_cast<void*>(pointer.get());
}
size_t count_owners() const {
if (core != nullptr) {
return core->cnt;
} else {
return 0;
}
}
private:
class Core {
public:
size_t cnt;
value_type* info;
~Core() {
Allocator allocator;
allocator.deallocate(info, sizeof(value_type));
info = nullptr;
}
};
Core* core;
};
}// namespace smart_pointer
#endif