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

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Пользователь

Хомулло Степан Николаевич

Время

14.11.2021 16:44 (25 д. 14:45) 16:47>>

Обработка

16:44 ... 16:44 (3,41 сек.)

Файл

SmartPointer.hpp (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 [?]

LI	Ошибка проверки исходного кода

код | результаты

SmartPointer.hpp:8:  Do not indent within a namespace  [runtime/indentation_namespace] [4]
SmartPointer.hpp:14:  Do not indent within a namespace  [runtime/indentation_namespace] [4]
SmartPointer.hpp:16:  "public:" should be preceded by a blank line  [whitespace/blank_line] [3]
SmartPointer.hpp:19:  Constructors callable with one argument should be marked explicit.  [runtime/explicit] [5]
SmartPointer.hpp:154:  private: should be indented +1 space inside class SmartPointer  [whitespace/indent] [3]
SmartPointer.hpp:188:  Namespace should be terminated with "// namespace smart_pointer"  [readability/namespace] [5]
SmartPointer.hpp:188:  Could not find a newline character at the end of the file.  [whitespace/ending_newline] [5]
Done processing SmartPointer.hpp
Total errors found: 7

[печатать | | ]

≡

#pragma once

#include <memory>
#include <type_traits>
#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;

SmartPointer(value_type *value = nullptr) {
            if (value != nullptr)
                core = new Core(value);
            else
                core = nullptr;
        }

// copy constructor
        SmartPointer(const SmartPointer &rhs) {
            core = rhs.core;

if (core != nullptr)
                core->Increment();
        }

// move constructor
        SmartPointer(SmartPointer &&rhs) {
            core = rhs.core;
            rhs.core = nullptr;
        }

// copy assigment
        SmartPointer &operator=(const SmartPointer &rhs) {
            SmartPointer& lhs = *this;
            lhs.core = rhs.core;

if (lhs.core != nullptr)
                lhs.core->Increment();

return *this;
        }

// move assigment
        SmartPointer &operator=(SmartPointer &&rhs) {
            SmartPointer& lhs = *this;
            lhs.core = rhs.core;
            rhs.core = nullptr;

return *this;
        }

//
        SmartPointer &operator=(value_type *rhs) {
            SmartPointer& lhs = *this;

if (lhs.core != nullptr)
                lhs.core->Decrement();

lhs = SmartPointer(rhs);

return *this;
        }

~SmartPointer() {
            if (core != nullptr) {
                core->Decrement();

if (core->CountOwners() == 0)
                    delete core;
            }
        }

// return reference to the object of class/type T
        // if SmartPointer contains nullptr throw `SmartPointer::exception`
        value_type &operator*() {
            if (!*this)
                throw smart_pointer::exception();

return *(core->Value());
        }

const value_type &operator*() const {
            if (!*this)
                throw smart_pointer::exception();

return *(core->Value());
        }

// return pointer to the object of class/type T
        value_type *operator->() const {
            if (*this)
                return core->Value();

return nullptr;
        }

value_type *get() const {
            if (*this)
                return core->Value();

return nullptr;
        }

// if pointer == nullptr => return false
        operator bool() const {
            return core != nullptr;
        }

// if pointers points to the same address or both null => true
        template<typename U, typename AnotherAllocator>
        bool operator==(const SmartPointer<U, AnotherAllocator> & rhs) const {
            const SmartPointer& lhs = *this;

if (!lhs && !rhs)
                return true;

if (!std::is_same<T, U>::value)
                return false;

return reinterpret_cast<U*>(lhs.get()) == rhs.get();
        }

// if pointers points to the same address or both null => false
        template<typename U, typename AnotherAllocator>
        bool operator!=(const SmartPointer<U, AnotherAllocator> & rhs) const {
            const SmartPointer& lhs = *this;

if (!lhs && !rhs)
                return false;

if (!std::is_same<T, U>::value)
                return true;

return reinterpret_cast<U*>(lhs.get()) != rhs.get();
        }

// if smart pointer contains non-nullptr => return count owners
        // if smart pointer contains nullptr => return 0
        std::size_t count_owners() const {
            if (core != nullptr)
                return core->CountOwners();

return 0;
        }

private:
        class Core {
         public:
            explicit Core(value_type* value) : value_(value) {
                Increment();
            }

value_type *Value() {
                return value_;
            }

value_type *Value() const {
                return value_;
            }

void Increment() {
                count_owners_++;
            }

void Decrement() {
                count_owners_--;
            }

std::size_t CountOwners() const {
                return count_owners_;
            }

private:
            value_type* value_;
            std::size_t count_owners_ = 0;
        };

Core *core;
    };
}

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