Counting at compile-time

[DLearner via Digitalmars-d-learn]

Suppose we have

```
enum Count = 0;
static if (<Compile-time evaluable cond-1>)
   ...

  enum Count = Count + 1; // is disallowed
else

static if (<Compile-time evaluable cond-2>)
   ...

  enum Count = Count + 1; // is disallowed
else

```

and the objective is to determine (at compile time) the number of 
times cond-1 or cond-2 is triggered (perhaps for setting size of 
a fixed array).

So answer is zero, 1 or 2.

But how to get that value into Count?