On Fri, 01 Jun 2012 08:32:02 -0400, d coder <dlang.co...@gmail.com> wrote:
Hello All
Particularly I would like to know if it is possible at all in D to
invoke a
class method transferred to a scope outside the class as an alias
argument.
Is it possible? Yes. But not easy. I won't go into the details, but
suffice to say, you must reconstruct a delegate and then call it.
D does not have "pointers to members" like C++ does. So when you alias
f.foo you are actually aliasing the function F.foo (without the context
pointer, and without a parameter to be able to place it).
However, there is another way -- use delegates:
void main() {
Foo f = new Foo();
auto dg = &f.foo; // need to make a symbol so it can be aliased
callfoo!(dg)();
}
Sorry if this is disappointing, D is not as low-level in this area. But
if you are willing to always pair a member function with its context
pointer, delegates are much simpler and more useful than pointers to
members:
void main() {
Foo f = new Foo;
auto dg = &f.foo;
dg();
}
-Steve
