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

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5787882

Пользователь

Доманский Игорь Сергеевич

Время

22:51<< 16.11.2021 22:55 (27 д. 20:56) 22:57>>

Обработка

22:55 ... 22:55 (3,17 сек.)

Файл

5787882.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 [?]

CE	Ошибка компиляции

код | результаты

In file included from main.cpp:2:0:
SmartPointer.hpp: In member function 'bool smart_pointer::SmartPointer<T, Allocator>::operator==(const smart_pointer::SmartPointer<U, AnotherAllocator>&) const [with U = float; AnotherAllocator = std::allocator<float>; T = float; Allocator = std::allocator<float>]':
SmartPointer.hpp:124:50: error: nonnull argument 'this' compared to NULL [-Werror=nonnull-compare]
         return (reinterpret_cast<void*>(this->get()) ==
                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
             reinterpret_cast<void*>(other.get()) ||
             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
             (!this && !other));
             ~~~~~~~~~~~~~~~~~~                    
SmartPointer.hpp: In member function 'bool smart_pointer::SmartPointer<T, Allocator>::operator!=(const smart_pointer::SmartPointer<U, AnotherAllocator>&) const [with U = float; AnotherAllocator = std::allocator<float>; T = float; Allocator = std::allocator<float>]':
SmartPointer.hpp:131:16: error: nonnull argument 'this' compared to NULL [-Werror=nonnull-compare]
         return !(reinterpret_cast<void*>(this->get()) ==
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
             reinterpret_cast<void*>(other.get()) ||
             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
             (!this && !other));
             ~~~~~~~~~~~~~~~~~~
SmartPointer.hpp: In member function 'bool smart_pointer::SmartPointer<T, Allocator>::operator==(const smart_pointer::SmartPointer<U, AnotherAllocator>&) const [with U = long unsigned int; AnotherAllocator = std::allocator<long unsigned int>; T = float; Allocator = std::allocator<float>]':
SmartPointer.hpp:124:50: error: nonnull argument 'this' compared to NULL [-Werror=nonnull-compare]
         return (reinterpret_cast<void*>(this->get()) ==
                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
             reinterpret_cast<void*>(other.get()) ||
             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
             (!this && !other));
             ~~~~~~~~~~~~~~~~~~                    
SmartPointer.hpp: In member function 'bool smart_pointer::SmartPointer<T, Allocator>::operator!=(const smart_pointer::SmartPointer<U, AnotherAllocator>&) const [with U = long unsigned int; AnotherAllocator = std::allocator<long unsigned int>; T = float; Allocator = std::allocator<float>]':
SmartPointer.hpp:131:16: error: nonnull argument 'this' compared to NULL [-Werror=nonnull-compare]
         return !(reinterpret_cast<void*>(this->get()) ==
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
             reinterpret_cast<void*>(other.get()) ||
             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
             (!this && !other));
             ~~~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors

[печатать | | ]

≡

#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* p = nullptr) {
        if (p == nullptr) {
            core = nullptr;
        } else {
            core = new Core(p);
        }
    }

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

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

SmartPointer& operator=(const SmartPointer& other) {
        if (&other == this)
            return *this;

if (core != nullptr) {
            core->count -= 1;
            if (core->count == 0) {
                delete core;
            }
        }
        core = other.core;
        if (other.core != nullptr) {
            core->count++;
        }

return *this;
    }

SmartPointer& operator=(SmartPointer&& other) {
        if (&other == this)
            return *this;

if (core != nullptr) {
            core->count -= 1;
            if (core->count == 0) {
                delete core;
            }
        }

core = other.core;
        other.core = nullptr;

return *this;
    }

SmartPointer& operator=(value_type* p) {
        if (core != nullptr) {
            core->count -= 1;
            if (core->count == 0) {
                delete core;
            }
        }

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

~SmartPointer() {
    }

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

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

value_type* get() const {
        if (core != nullptr)
            return core->p;
        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()) ||
            (!this && !other));
    }

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

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

private:
    class Core {
     public:
        value_type* p;
        std::size_t count;

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

~Core() {
            Allocator a;
            a.deallocate(p, sizeof(value_type));
            p = nullptr;
        }

value_type get() {
            return *p;
        }
    };
    Core* core;
};
}  // namespace smart_pointer

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