Or even shorter yet:

Code:
if(ent_create("any.mdl", vector(0, 0, 0), foobar))
{
    // Your code here. You can use the you pointer to access the created entity
}


if you need a pointer other than you but keep it a one line, here you go:

Code:
if((bar = ent_create("any.mdl", vector(0, 0, 0), foobar)))
{
   // Your code here.
   // Note: You don't need the extra pair of parenthesizes around the if(),
   // but any sophisticated compiler will warn about the assignment otherwise 
}

Shitlord by trade and passion. Graphics programmer at Laminar Research.
I write blog posts at feresignum.com