description

# registerBinaryCallback<R, T1, T2> method Null safety

ZoneBinaryCallback<R, T1, T2> registerBinaryCallback <R, T1, T2>(

1. R callback(
   1. T1 arg1,
   2. T2 arg2
   )

)

Registers the given callback in this zone.

Similar to registerCallback but with a unary callback.

## Implementation

    ZoneBinaryCallback<R, T1, T2> registerBinaryCallback<R, T1, T2>(
        R callback(T1 arg1, T2 arg2));