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

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5787102

User

Росляков Владимир Олегович

Time

16.11.2021 20:46 (27 d. 18:47) 20:47>>

Processing

20:46 ... 20:46 (1,76 sec.)

File

5787102.cpp (CLang++ 5.0.0 + Address Sanitizer)

Contest

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

Problem

C: Smart Pointer

Testset

Limits

Time: 25s Memory: 512Mb

Status [?]

LI	Source check error

source | results

SmartPointer.hpp:13:  Redundant blank line at the start of a code block should be deleted.  [whitespace/blank_line] [2]
SmartPointer.hpp:22:  Do not leave a blank line after "public:"  [whitespace/blank_line] [3]
SmartPointer.hpp:162:  Namespace should be terminated with "// namespace smart_pointer"  [readability/namespace] [5]
Done processing SmartPointer.hpp
Total errors found: 3

[print | | ]

≡

#pragma once
#include <memory>
#include <type_traits>

namespace smart_pointer {
class exception : std::exception {
  using base_class = std::exception;
  using base_class::base_class;
};

template<typename T, typename Allocator>
class SmartPointer {

public:
  using value_type = T;

private:
  value_type *value_;
  std::size_t count_owners_;

public:

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

SmartPointer(const SmartPointer &A) {
    core = A.core;

if (*this)
      core->Increment();
  }

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

SmartPointer &operator=(const SmartPointer &A) {
    this->~SmartPointer();
    core = A.core;
    if (*this)
      core->Increment();
    return *this;
  }

SmartPointer &operator=(SmartPointer &&A) {
    this->~SmartPointer();
    core = A.core;
    A.core = nullptr;
    return *this;
  }

SmartPointer &operator=(value_type *A) {
    this->~SmartPointer();
    if (A != nullptr)
      core = new Core(A);
    else
      core = nullptr;
    return *this;
  }

~SmartPointer() {
    if (*this) {
      core->Decrement();
      if (core->CountOwners() == 0)
        delete core;
    }
  }

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());
  }

value_type *operator->() const {
    if (*this)
      return core->Value();
    return nullptr;
  }

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

return nullptr;
  }

operator bool() const {
    return !(core == nullptr || core->Value() == nullptr);
  }
  template<typename U, typename AnotherAllocator>
  bool operator==(const SmartPointer<U, AnotherAllocator> &A) const {
    if (!*this && !A)
      return true;
    if (!std::is_same<T, U>::value)
      return false;
    return reinterpret_cast<void *>(get()) ==
        reinterpret_cast<void *>(A.get());
  }

template<typename U, typename AnotherAllocator>
  bool operator!=(const SmartPointer<U, AnotherAllocator> &A) const {
    if (!*this && !A)
      return false;
    if (!std::is_same<T, U>::value)
      return true;
    return reinterpret_cast<void *>(get()) !=
        reinterpret_cast<void *>(A.get());
  }

std::size_t count_owners() const {
    if (*this)
      return core->CountOwners();
    return 0;
  }

private:
  class Core {
   public:
    explicit Core(value_type *value) : value_(value), count_owners_(0) {
      Increment();
    }

~Core() {
      delete value_;
      value_ = nullptr;
    }

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_;
    }
  };
  Core *core;
};
}

(3 233 b)

0.182s 0.010s 10