Thread: Declaration inside for statement - scope according to the standard

That's interesting. It also means that this is legal:

Code:

while (int i = 1) {
    int i = 0;
}

Though personally I always thought it was not, and hence read the standard for the for loop with this assumption.

It also means that this is legal:

this is not clear... The condition in the () is checked on every iteration...
does it mean that the int i is executed on every iteration? then the scope of the variable will be the same as the second i...
if not - it will be something very tricky...

More or less. This will help.

Again according to the standard:

Originally Posted by 6.5.1.2

while (T t = x) statement

is equivalent to

Code:

label:
    { // start of condition scope
        T t = x; <-- notice the object creation location. 
        if (t) { <-- new scope here
            statement
            goto label; <-- condition object destruction
       }
    } // end of condition scope

The object created in a condition is destroyed and created with each iteration of the loop.