9E/12.10 ArraySubscriptOperator_MyString.cpp at main · learncppnow/9E · GitHub

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#include <iostream>

#include <algorithm>

using namespace std;

class MyBuffer

{

private:

int* myNums;

unsigned int bufLength;

public:

MyBuffer(unsigned int length)

{

bufLength = length;

myNums = new int[length]; // allocate memory

}

int& operator[] (unsigned int index)

{

return myNums[index];

}

// const version will be used by const instances of MyBuffer

const int& operator[] (unsigned int index) const

{

return myNums[index];

}

MyBuffer(const MyBuffer& src)

{

cout << "Copy constructor creating deep copy" << endl;

bufLength = src.bufLength;

myNums = new int[bufLength];

copy(src.myNums, src.myNums + bufLength, myNums); // deep copy

}

MyBuffer& operator= (const MyBuffer& src)

{

cout << "Copy Assignment creating deep copy" << endl;

if (myNums != src.myNums) // avoid copy to self

{

if (myNums)

delete myNums;

bufLength = src.bufLength;

myNums = new int[bufLength];

copy(src.myNums, src.myNums + bufLength, myNums); // deep copy

}

return *this;

}

~MyBuffer()

{

delete[] myNums; // free allocated memory

}

void SetValue(unsigned int index, int value)

{

if (index < bufLength) // check for bounds

*(myNums + index) = value;

}

};

int main()

{

cout << "How many integers would you like to store? ";

unsigned int numsToStore = 0;

cin >> numsToStore;

MyBuffer buf(numsToStore);

for (unsigned int counter = 0; counter < numsToStore; ++counter)

{

cout << "Enter value: ";

cin >> buf[counter];

}

for (unsigned int counter = 0; counter < numsToStore; ++counter)

cout << "Value " << counter << " is " << buf[counter] << endl;

// const MyBuffer bufConst(1); // requires const variant of operator[]

return 0;

}

9E/12.10 ArraySubscriptOperator_MyString.cpp at main · learncppnow/9E · GitHub

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