On Sun, 06 Jan 2019 20:19:59 +0000, Rubn wrote:
> You can declare functions inside of functions in D. You weren't forward
> declare grow() in the module namespace, so much as you were forward
> declaring a new function grow.
Unfortunately, you can't do forward declarations for nested functions. If
you could, that would be handy for mutual recursion:
void main()
{
int a(int i);
int b(int i)
{
if (i > 0) return a(i - 1);
return abs(i);
}
int a(int i)
{
if (i % 2 == 0) return b(i - 2);
return b(i - 1);
}
writeln(a(12));
}
Unfortunately, Error: declaration a is already defined
And omitting the forward declaration gets you: Error: undefined identifier
a
