On 03/05/12 21:16, H. S. Teoh wrote:
> I know D doesn't really have RTTI yet, but I'm experimenting with
> "faking" it by doing something like:
>
> class A {
> string prop1;
> int prop2;
> ...
> void serialize() {
> __serialize(this);
> }
> }
>
> void __serialize(T)(T obj) {
> writeln(typeid(obj));
> foreach (name; __traits(derivedMembers, T)) {
> writefln("%s = %s", name,
> __traits(getMember,obj,name));
> }
> }
>
> The only thing is, serialize() has to be declared in every derived
> class, because T needs to be known at compile-time. Is there a way to
> "automate" this? I.e., automatically insert the serialize() boilerplate
> code into derived classes?
Well, what exactly are you trying to do? IOW why "derivedMembers" - do you
really need to skip serializing parts of the class hierarchy?
If not, this should work.
class A {
string prop1;
int prop2;
void serialize(this THIS)() {
__serialize(cast(THIS*)&this);
}
}
void __serialize(T)(T* obj) {
writef("%s {\n", typeid(*obj));
foreach (name; __traits(allMembers, T)) {
static if (__traits(compiles,&__traits(getMember,obj,name))) {
alias typeof(__traits(getMember,obj,name)) MT;
static if (is(MT==function))
continue;
else {
auto m = __traits(getMember,obj,name);
if (is(MT:const(char[])))
writef(" %s %s = \"%s\";\n", typeid(MT), name, m);
else
writef(" %s %s = %s;\n", typeid(MT), name, m);
}
}
}
writef("}\n");
}
And it will do the right thing for derived classes too.
Real programmers don't use mixins, :^)
artur
