Question

What is the best way to check the pointer return by a new operator
I see following type of code. Assume I have class Test

Type 1

Test *ptr = new Test;
if ( ptr == NULL ) {
}

Type 2

Test *ptr = new Test;
if ( !ptr ) {
}

Type 3

Test *ptr = new Test;
if ( ptr == (Test*)0 ) {
}

Answer 1

You do not check new for null it throws an exception std::bad_alloc in case it fails.
So you handle the exception.

Ofcourse, the above rule applies if you are not using the nothrow version of new.

 try
  {
    Test *ptr = new Test;
  }
  catch (std::bad_alloc &e)
  {
    cout << "new Failed";
  }