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Created September 30, 2018 12:43
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[Futures and Promises] #design_pattern
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notes.md

In the broadest sense,

  • A future or promise can be thought of as a value that will eventually become available.
  • Future is used for sychronizing program execution.
  • Future acts as a proxy for an result which will be eventually available.
  • The construct ( future X ) immediately returns a future for the value of the expression X and concurrently begins evaluating X. When the evaluation of X yields a value, that value replaces the future.
  • A future is a placeholder object for a result that does not yet exist. A promise is a writable, single-assignment container, which completes a future. Promises can complete the future with a result to indicate success, or with an exception to indicate failure.
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