Thread: constructor called twice

hi
I found two statements in a working program which calls constructor twice.
The first statement creates an object by calling two argument constructor.
In the second statement the same object calls one argument constructor.

The statements are below

Code:

1. for_fft_type for_fft(Domain<1>(nrange), 1.0);
2. for_fft(replica);

is this legal .please explain
thank u

Thank u anon
you r right .It is overloaded operator().