| io.reactivex.SingleTransformer<Upstream, Downstream> | 
Interface to compose Singles.
| Public Methods | |||||||||||
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| abstract SingleSource<Downstream> | apply(Single<Upstream> upstream) Applies a function to the upstream Single and returns a SingleSource with
 optionally different element type. | ||||||||||
Applies a function to the upstream Single and returns a SingleSource with optionally different element type.
| upstream | the upstream Single instance | 
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