Variable not initialized as condition c++

Question

I want to do an if like:

if(x has not been initialized)
{...
}

Is this possible? Thanks

Answer 1

"There is no way of checking of the contents of a variable are undefined or not. The best thing you can do is to assign a signal/sentinel value (for example in the constructor) to indicate that further initialization will need to be carried out."

Alexander Gessler

from here

Answer 2

To implement that behavior you may use pointers, default initiated to 0.

For example:

int *number = 0;
// ...
if (!number) {
    // do something
}

You may use that trick with any types, not just integers:

Cat *kitty = 0;
// ...
if (!kitty) {
    // do something
}