My new favorite D feature

[Pragma]

alex4u2nv wrote:
> Im new to this language and just getting aquainted, but what happens in the
> scenario of saving and evaluating the return value of a function within the if
> statement to be used elsewhere.
> 
> bool search() { //find something; if (..) return index; else return 0;//not found }
> 
> if ( retval = search() )
>    {
>      writefln("found:");
>      writefln(retval);
>    } else {
>      writefln( "not found" );
>    }
> 
> 
> // or something similar?

You have to make it look like a variable declaration at the same time, 
thus forcing you to be more explicit:

if(auto retval = search()){ /*...*/ }

The operative word here is 'explicit': it's impossible to confuse with 
simply forgetting that extra '='.

However, the only drawback here is that the variable used in the if() 
statement is scoped to the if()'s true branch.  It's all here:

http://www.digitalmars.com/d/statement.html#IfStatement

-- 
- EricAnderton at yahoo