@Mephisztoe Not sure if we'll ever use them in @handmade_hero, but they take 8 statements to implement, so, not much to talk about :P
@Mephisztoe
Add:
I->Prv = N->Prv; I->Nxt = N;
I->Prv->Nxt = I; I->Nxt->Prv = I;
Remove:
R->Prv->Nxt = R->Nxt;
R->Nxt->Prv = R->Prv;
Done.
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