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c++classdata-members

What happens to uninitialized class members in c++?

What happens to uninitialized class members in c++? If I have to do this, what should I take care of?

#include <iostream> 
using namespace std;

class Foo {
    int attr1, attr2;   
public:
    Foo ();

Foo::Foo () {   attr1 = 5; }

Foo myThing();
Solution

  • What happens to uninitialized class members in c++?

    They are default initialized, which in case of fundamental types like int means that it will have an indeterminate value.

    what should I take care of?

    You should take care to never read an indeterminate value.