//a3.h

// Name :

#include "cmpt_error.h" // These are the only

#include // files you can #include.

#include // Don't remove or change

#include // any of them, and don't #include // #include any others.

#include

using namespace std;

class int_vec {

private:

// ...

public:

// ...

}; // class int_vec

// ...

=====================================================================

// a3_test.cpp

// Name :

#include "a3.h"using namespace std;// ... put testing functions here ...int main() {  cout 
=====================================================================
// cmpt_error.h// By defining CMPT_ERROR_H, we avoid problems caused by including this file// more than once: if CMPT_ERROR_H is already defined, then the code is *not*// included.#ifndef CMPT_ERROR_H#define CMPT_ERROR_H#include #include // C++ already has function called error, and so we put our error function// inside a namespace called cmpt. Thus, to use this error function, we will// write its full name, cmpt::error.namespace cmpt {// runtime_error is a pre-defined C++ object meant to be "thrown" when an// error occurs while a program is running. When it is thrown, the program// will end and print the given error message.inline void error(const std::string& message){    throw std::runtime_error(message);}} // namespace cmpt

14. (1 mark) Implement a constructor int_vec (fname) that creates a new int_vec by reading int s from the text file fname (where fname is type string). You can assume fname contains valid int s separated by whitespace characters. For example, this prints the numbers in data11.txt: int_vec a("data11.txt"); for(int i = 0; i