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Added futuretype docs

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Joannis Orlandos 2017-11-27 00:19:27 +01:00
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# Future basics
Futures are used throughout Vapor, so it is useful to know some of the available helpers. We explain the reasoning and use cases [here](../concepts/async.md).
Futures are used throughout Vapor, so it is useful to know some of the available helpers. We explain the reasoning and use cases [here](../concepts/async.md). They are the primary [`FutureType`](futuretype.md) implementation.
## Adding awaiters to all results

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# FutureType
FutureType is a protocol defining any entity that provides the ability to register callback closures for an object that _may_ be returned in the future.
FutureTypes call the registered closure with either an error or the `Expectation`. FutureTypes _may_ return this in the future. The can, instead, also call the closure immediately.
This pattern is adopted by [`Response`](../http/response.md) among other types. We recommend libraries to be generic to FutureType rather than depending on a specific implementation such as [`Future`](futures.md)