On Sunday, 30 March 2014 at 12:42:16 UTC, Jack Applegame wrote:
Target is to create a template for mapping member "array
accessor" to member function.
For example:
class Foo {
...
int elementsAccessor(size_t index) { ... }
...
mixin MagicTemplateMixin!("elements", elementsAccessor);
// or better
alias elements = SuperMagicTemplate!elementsAccessor;
}
and now we can call Foo.getter like this:
auto foo = new Foo;
int el = foo.elements[10]; // int el = foo.getter(10);
I wrote poor and ugly solution with proxy structure:
http://dpaste.dzfl.pl/93085910f8c7
I hate it. :)
I need more powerful spell, but my magic level is too low.
Maybe less is more here:
---
struct OpIndexFromAccessor(R, PS) {
R delegate(PS) dg;
R opIndex(PS ps) { return dg(ps); }
}
auto opIndexFromAccessor(R, PS)(R delegate(PS) accessor) {
return OpIndexFromAccessor!(R, PS)(accessor);
}
class Foo {
int elementsAccessor(size_t index) { ... }
auto elements() {return
opIndexFromAccessor(&elementsAccessor);}
/* This is hardly more complex than the mixin or alias
variants. */
}
---
