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

Registers the given callback in this zone.

Similar to registerCallback but with a unary callback.

Source 

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