2 курс. Программирование на C++. Турнир 2, осень 2021

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5788239

Пользователь

Доманский Игорь Сергеевич

Время

23:32<< 16.11.2021 23:33 (27 д. 21:34)

Обработка

23:33 ... 23:33 (3,07 сек.)

Файл

5788239.cpp (CLang++ 5.0.0 + Address Sanitizer)

Турнир

2 курс. Программирование на C++. Турнир 2, осень 2021

Задача

C: Smart Pointer

Набор тестов

Ограничения

Время: 25с Память: 512Мб

Состояние [?]

Принято

код | результаты

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#include <memory>
#include "Test.hpp"

#ifndef SMARTPOINTER_HPP
#define SMARTPOINTER_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* p = nullptr) {
        if (p == nullptr) {
            core = nullptr;
        } else {
            core = new Core(p);
        }
    }

SmartPointer(const SmartPointer& other) {
        core = other.core;
        if (other.core) {
            core->count++;
        }
    }

SmartPointer(SmartPointer&& other) {
        core = other.core;
        other.core = nullptr;
    }

SmartPointer& operator=(const SmartPointer& other) {
        if (core != nullptr) {
            core->count--;
            if (core->count == 0) {
                delete (core);
            }
        }
        core = other.core;
        if (other.core) {
            core->count++;
        }

return *this;
    }

SmartPointer& operator=(SmartPointer&& other) {
        if (core != nullptr) {
            core->count--;
            if (core->count == 0) {
                delete (core);
            }
        }

this->core = other.core;
        other.core = nullptr;

return *this;
    }

SmartPointer& operator=(value_type* p) {
        if (core != nullptr) {
            core->count--;
            if (core->count == 0) {
                delete (core);
            }
        }

if (p != nullptr) {
            core = new Core(p);
        } else {
            core = nullptr;
        }
        return *this;
    }

~SmartPointer() {
        if (core != nullptr) {
            core->count--;
            if (core->count == 0) {
                delete (core);
            }
        }
    }

value_type& operator*() {
        if (core != nullptr)
            return *(core->ptr);
        throw smart_pointer::exception();
    }
    const value_type& operator*() const {
        if (core != nullptr)
            return *(core->ptr);
        throw smart_pointer::exception();
    }

value_type* operator->() const {
        if (core != nullptr)
            return core->ptr;
        return nullptr;
    }

value_type* get() const {
        if (core != nullptr)
            return core->ptr;
        return nullptr;
    }

operator bool() const {
        return core != nullptr;
    }

template<typename U, typename AnotherAllocator>
    bool operator==(const SmartPointer<U, AnotherAllocator>& other) const {
        return (reinterpret_cast<void*>(this->get()) ==
            reinterpret_cast<void*>(other.get()));
    }

template<typename U, typename AnotherAllocator>
    bool operator!=(const SmartPointer<U, AnotherAllocator>& other) const {
        return (reinterpret_cast<void*>(this->get()) !=
            reinterpret_cast<void*>(other.get()));
    }

std::size_t count_owners() const {
        if (core == nullptr) return 0;
        return core->count;
    }

private:
    class Core {
     public:
        value_type* ptr;
        size_t count;

explicit Core(value_type* p) : ptr(p), count(1) {}

~Core() {
            Allocator a;
            a.deallocate(ptr, sizeof(value_type));
            ptr = nullptr;
        }
    };
    Core* core;
};
}  // namespace smart_pointer
#endif

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