Delay allocating class instance in stack.

[ANtlord via Digitalmars-d-learn]

Hello! I read documentation about memory management and can't 
find description about delay allocation of instance. I have a 
method marked by @nogc. This method takes boolean variable. If 
this variable is true I want to construct object with one set of 
parameters else I want to construct object with another set of 
parameters. Take a look at code for clearance.

void method(bool flag) @nogc
{
        scope MyClass obj;
        if(flag) {
                obj = new MyClass(1);
        } else {
                obj = new MyClass(2);
        }
        // using obj
}
But this code CAN'T be compiled. How should I declare object for 
delay construction.
Thanks.