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cpp vector structure

Makyu answered on October 7, 2020 Popularity 10/10 Helpfulness 2/10

answer cpp vector structure

related vector cpp

cpp vector structure

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#include <vector>

typedef struct test1 {
  int a;
  char b;
} TOTO;

std::vector<TOTO> _v;

_v.push_back((TOTO){10, 'a'});
_v[0].a = 101;

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Tags: c++ structure vector

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Contributed on Oct 07 2020

Makyu

0 Answers Avg Quality 2/10

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vector cpp

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//
// Created by merom on 5/4/2023.
//

#ifndef HOMEWORK_NO_SUBMISSION_MYVECTOR_IMP_H
#define HOMEWORK_NO_SUBMISSION_MYVECTOR_IMP_H

#include <exception>
#include "MyVector.h"


template<class T>
template<class Iter>

Vector<T>::Vector(Iter begin, Iter end):size_(std::distance(begin,end)), capacity_(size_), data_(new T[size_],std::default_delete<T[]>()){
    std::copy(begin,end,data_.get());
}

template<class T>
Vector<T>::Vector():size_(0),capacity_(0),data_(nullptr){

}


template<class T>
Vector<T>:: Vector(int size):size_(size),capacity_(size),data_(new T[size], std::default_delete<T[]>()) {
    std::for_each(begin(),end(), []( T & val){val = T();});

}

template<class T>
Vector<T>::Vector(const Vector &other):size_(other.size_),capacity_(other.capacity_),data_(std::make_shared<T[]>(new T[other.size_], std::default_delete<T[]>())) {
    std::copy(other.data_.get(), other.data_.get() + other.size_, data_.get());
}

template<class T>
Vector<T> &Vector<T>::operator=(const Vector &other) {
    if (this != &other) {
        std::swap(*this, Vector{ other });
    }

    return *this;
}


template<class T>
Vector<T>::Vector(Vector &&other) noexcept:data_(std::move(other.data_)),size_(other.size_),capacity_(other.capacity_){
    other.data_.reset();
    other.size_ = 0;
    other.capacity_ = 0;
}




template<class T>
Vector<T> &Vector<T>::operator=(Vector &&other) noexcept {
    if (this != &other) {
        data_ = std::move(other.data);
        size_ = other.size_;
        capacity_ = other.capacity_;
        other.data.reset();
        other.size_ = 0;
        other.capacity_ = 0;
    }
    return *this;
}


template<class T>
void Vector<T>::reserve(size_t new_capacity){
    if(new_capacity > capacity_){
        std::shared_ptr<T[]> new_data(new T[new_capacity], std::default_delete<T[]>());
        std::copy(data_.get(), data_.get() + size_, new_data.get());
        data_ = std::move(new_data);
        capacity_ = new_capacity;
    }
}


template<class T>
void Vector<T>::push_back(const T &value) {
    if (size_ == capacity_) {
        reserve(capacity_ == 0 ? 1 : 2 * capacity_);
    }
    /*Same as data_.get() + size = new T(value) */
    new (data_.get() + size_) T(value);
    size_++;
}

template<class T>
void Vector<T>::emplace_back( T &&value) {
    if (size_ == capacity_) {
        reserve(capacity_ == 0 ? 1 : 2 * capacity_);
    }
    /*Same as data_.get() + size = new val */
    new (data_.get() + size_) T(value);
    size_++;
}



template<class T>
void Vector<T>::print(const Vector::iter first, const Vector::iter last, const char *lb , const char *sep, std::ostream &os) {
    if(lb != nullptr && *lb != '\0')
        os << lb << ": " << sep;
    using type = decltype(*first); // typedef typename std::iterator_traits<T>::type T;
    std::copy(first, last,std::ostream_iterator<type>(os,sep));
    os << std::endl;
}

template<class T>
T & Vector<T>::at(int i) {
    if( i >= size_ ||  i < 0){
        throw std::out_of_range("index out of range");
    }
    return operator[](i);
}

template<class T>
void Vector<T>::erase() {
    data_.reset();      // release the shared pointer, deallocating the array
    size_ = 0;          // reset the size to zero
    capacity_ = 0;
}

#endif //HOMEWORK_NO_SUBMISSION_MYVECTOR_IMP_H

Popularity 9/10 Helpfulness 2/10 Language cpp

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Tags: c++ vector

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Contributed on Aug 26 2023

Mero

0 Answers Avg Quality 2/10

vector cpp

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//
// Created by merom on 5/4/2023.
//

#ifndef HOMEWORK_NO_SUBMISSION_MYVECTOR_H
#define HOMEWORK_NO_SUBMISSION_MYVECTOR_H
#include <memory>
#include <algorithm>
#include <iterator>

template<class T>

class Vector {

public:
    /*ctr's*/
    Vector();
    explicit Vector(int size);
    Vector(const Vector & other) ;
    Vector(Vector && other)   noexcept ;
    Vector<T> & operator =(const Vector & other);
    Vector<T> & operator =(Vector && other) noexcept ;
    ~Vector()=default;
    /*Random access*/
    template<class Iter>
    Vector(Iter begin, Iter end);


public:
    void push_back(const T& value);
    void emplace_back( T&& value);


    // Accessors
    size_t size() const {
        return size_;
    }

    T& at(int i);

    size_t capacity() const {
        return capacity_;
    }

    // Index operators
    T& operator[](size_t index) {
        return data_[index];
    }

    const T& operator[](size_t index) const {
        return data_[index];
    }

    [[nodiscard]] bool is_empty() const {return data_.size == 0;}

    void erase();

    template <class comp>
    void sort(comp cm);

public:

class iter {
    public:

        using value_type = T;
        using reference = T&;
        using pointer = T*;
        using difference_type = std::ptrdiff_t;
        using iterator_category = std::random_access_iterator_tag;

    explicit iter( pointer ptr) : ptr_(ptr) {}

    typename std::iterator_traits<iter>::reference operator*() const { return *ptr_; }

        pointer operator->() const { return ptr_; }

        iter& operator++() {
            ++ptr_;
            return *this;
        }
        const iter operator++(int) {
            iter temp = *this;
            ++ptr_;
            return temp;
        }
        iter& operator--() {
            --ptr_;
            return *this;
        }
        iter operator--(int) {
            iter temp = *this;
            --ptr_;
            return temp;
        }

        iter& operator+=(difference_type n){
            ptr_ += n;
            return *this;
        }

        iter operator+(difference_type n) {
            iter temp = *this;
            return temp+=n;
        }
        iter operator+(difference_type n) const {
            iter temp = *this;
            return temp += n;
        }

        friend iter operator+(difference_type n, iter const& it) {
            return it + n;
        }

        iter& operator-=(difference_type n) {
            return *this += -n;
        }

        iter operator-(difference_type n) const {
            iter temp = *this;
            return temp -= n;
        }

        difference_type operator-(iter const& other) const {
            return ptr_ - other.ptr_;
        }

        reference operator[](difference_type n) const {
            return *(*this + n);
        }


        bool operator==(iter const& other) const {
            return ptr_ == other.ptr_;
        }
        bool operator!=(iter const& other) const {
            return ptr_ != other.ptr_;
        }
        bool operator<(iter const& other) const {
            return ptr_ < other.ptr_;
        }
        bool operator>(iter const& other) const {
            return ptr_ > other.ptr_;
        }
        bool operator<=(iter const& other) const {
            return ptr_ <= other.ptr_;
        }
        bool operator>=(iter const& other) const {
            return ptr_ >= other.ptr_;
        }

    private:
        pointer ptr_;
    };

    // Other Vector class members...

    iter begin() {
        return iter(data_.get());
    }

    iter end() {
        return iter((data_.get() + size_));
    }

public:
    void print(const iter first , const iter last , const char* lb = "",
               const char* sep = "\n",
               std::ostream& os = std::cout);



private:
    size_t size_{};
    size_t capacity_{};
    std::shared_ptr<T[]> data_;
    void reserve(size_t new_capacity);


};


template<class T>
template<class comp>
void Vector<T>::sort(comp _cmp) {
    std::sort(Vector<T>::begin(),Vector::end(), _cmp);
}


#include "MyVector_imp.h"
#endif //HOMEWORK_NO_SUBMISSION_MYVECTOR_H

Popularity 9/10 Helpfulness 1/10 Language cpp

Source: Grepper

Tags: c++ vector

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Contributed on Aug 26 2023

Mero

0 Answers Avg Quality 2/10

cpp vector structure

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