Tomek Sowiński napisał: > > What is the purpose of nested function declarations in D? Is it a good idea > > to just disallow them? > > 1. Helper functions don't clutter the namespace. > 2. Nested functions can access the outer function's stack frame.
OK, I just noticed you asked about declarations, not nested functions in
general.
They're useful for testing:
unittest {
int foo();
static assert (is(ReturnType!foo == int));
}
--
Tomek
