d coder <dlang.co...@gmail.com> wrote:
Greetings
I need a way to know (using traits or other compile time constructs)
all the types derived from a given type.
Is it possible in D?
No.
Is it possible to get a list of all the user-defined classes? I could
use that to filter out the classes that I need.
No.
However, it is possible at run-time to iterate through all classes and
at that time compare them to the base class:
T[] getDerivedClasses( T )( ) if ( is( T == class ) ) {
T[] result;
foreach ( mod; ModuleInfo ) {
foreach ( cls; mod.localClasses ) {
if ( mod.name == "object" ) {
break;
}
auto cls_base = cls;
do {
if ( cls_base.name == T.classinfo.name ) {
if ( T tmp = cast(T)cls.create( ) ) {
result ~= tmp;
}
}
} while ( ( cls_base = cls_base.base ) != Object.classinfo );
}
}
return result;
}
--
Simen
