411 REFERENCE · Wikibooks
D Programming/Mixins
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
A mixin is the possibility to make a copy of a template to a specified place.
template t(T){
T get(){
return mValue;
}
}
This alone makes no sense. But if you want to insert it into a class,
which has got a member variable mValue this can make sense.
class C{
private int mValue;
mixin t!(int);
}
You can use mixins to assemble a class out of pieces.
Make an outer class know the mixin
If you need a way to make your mixin known to the outer class, you can use
static constructors.
template t(T){
static this(){
sMixinCounter++;
}
}
class C{
private static int sMixinCounter;
private int mValue;
mixin t!(int);
}
If you want to use multiple of such mixin, they have to be named, to avoid linker errors.
class C{
private static int sMixinCounter;
private int mValue;
mixin t!(int) t1;
mixin t!(int) t2;
}