is this a variable or function

Question

I was just looking through implementation of non local means algorithm via google (thanks google for code search) and come across this function mirror.

temp         


        

Answer 1

It is a variable declaration, and it is equivalent to this:

const int32 alpha = src%size;

Answer 2

This is a variable declaration. A declaration of the form:

type variablename = value;

is essentially equivalent to:

type variablename(value);

This is the case regardless of what type is - whether it is a user-defined class or a built-in type. Note that the reverse is not always the case - the = syntax requires that there be an accessible copy constructor.

For similar reasons, you can cast arithmetic types using the constructor syntax, as in: x = int(42.0);