#include <iostream>
#include "ArrayT.h"

using namespace std;

ArrayT::ArrayT(){
   size = 0;
   capacity = 0;
   data = nullptr;
}

ItemType & ArrayT::operator[] (size_t index){
    return data[index];
}

void ArrayT::PushBack(ItemType item){

    if (size == capacity) {

       if (capacity == 0) {
         capacity = 1;
       } else {
       capacity *= 2;
       }

       ItemType * tmp{new ItemType[capacity]};

       for(size_t i = 0; i < size; ++i) {
           tmp[i] = data[i];
       }
       delete [] data;
       data = tmp;
    }

    data[size] = item;
    ++size;
}

void ArrayT::PopBack(){
    if (size > 0) {
      --size;
    }
}

size_t ArrayT::Size() const {
    return size;
}

size_t ArrayT::Capacity() const {
   return capacity;
}