// This is C++
void f() {
  static int myvar=myfunc(); // will be initialized only at the first call of f()
  ...
  g(++myvar); // Incremented on every call
}

##</code><code>##

sub f {
  our $myval;
  BEGIN { $myval=myfunc() };
  ...
  g(++$myval);
}