Практика 8

vector.cpp

#include "vector.h"

vector_int::vector_int() {
    size_ = 0;
    capacity_ = 16;
    data_ = new int[capacity_];
}

void vector_int::reserve(size_t new_size) {
    if (new_size <= capacity_)
        return;
    capacity_ = new_size;
    int *new_data = new int[capacity_];
    for (size_t i = 0; i != size_; i++) {
        new_data[i] = data_[i];
    }
    delete[] data_;
    data_ = new_data;
}

vector.h

#pragma once

#include <cstddef>

class vector_int {
public:
    vector_int();
    ~vector_int();

    vector_int(const vector_int& other);
    vector_int& operator=(const vector_int& other);

    void push_back(int x);
    void reserve(size_t new_size);

    int& operator[](size_t id);
    const int& operator[](size_t id) const;

private:
    int *data_;
    size_t size_;
    size_t capacity_;
};