Speculative realism seems to be based primarily on opposing the Kantian philosophy of correlationism - I quote Meillassoux:
Correlationism consists in disqualifying the claim that it is possible to consider the realms of subjectivity and objectivity independently of one another. Not only does it become necessary to insist that we never grasp an object “in itself”, in isolation from its relation to the subject, but it also becomes necessary to maintain that we can never grasp a subject that would not always-already be related to an object
I find it hard to believe that similar notions have not been articulated in other philosophies, such as objectivism, postivisim, rationalism etc. Is it possible to summarize in what ways speculative realism (specifically Meillassoux's philosophy) is fundamentally different from the philosophy of other post-Kantian thinkers, and what may be good resources to get a clearer view of the picture?