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<p>which are naturally supported in the <a href="page.php?w=actor_model">actor model</a> of computation and pure <a href="page.php?w=object-oriented_programming">object-oriented programming</a> languages like <a href="page.php?w=Smalltalk">Smalltalk</a>. The Friedman and Wise paper described only explicit futures, probably reflecting the difficulty of efficiently implementing implicit futures on stock hardware.  The difficulty is that stock hardware does not deal with futures for primitive data types like integers. For example, an add instruction</p><p>
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