CODEWITHSUNDEEP
c++
Akilesh
Akilesh

Reputation: 1310

pointer to class vs pointer to builtin types

after declaration the pointer to int is not NULL whereas a pointer to class is NULL.

int *pint;
MyClass *Myob;
if (pint){
    cout << "pint is not null";
}
if (!Myob){
    cout << "Myob is null";
}

Why aren't pointers to Built in types and pointers to classes behaving the same way?

Upvotes: 0

Views: 78

Answers (1)

0x0001
0x0001

Reputation: 525

Nope, the pointer to both the in-built and as well as class type have indeterminate value and will lead to undefined behavior. In C or C++, if you write

int a;

or

int *b;
MyClass *c;

then a, b, c will have indeterminate value (or garbage value). If you want to initialize them as nullptr then you can declare them static (not a good approach) or initialize them explicitly as int a = 10 or int *b = nullptr.

You should always initialize pointers to NULL or nullptr (if your compiler supports C++11, assigning NULL to pointers is deprecated).

Upvotes: 3

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