Relation To Lazy Evaluation
Lazy futures, where the computation of the future's value starts when the value is first needed, are closely related to lazy evaluation. However, the term lazy evaluation is most often used to refer to an evaluation strategy for all computation in a language, whereas lazy futures represent specific values that are computed lazily, even in a language where computation is normally strict or eager. In C++11 such lazy futures can be created by passing the std::launch::sync launch policy to std::async, along with the function to compute the value.
Read more about this topic: Futures And Promises
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—Friedrich Nietzsche (1844–1900)