Method Concurrent.Future()->filter()

Method filter

this_program filter(function(ValueType, __unknown__ ... :bool) fun, mixed ... extra)

Description

This specifies a callback that is only called on success, and allows you to selectively alter the future into a failure.

Parameter fun

Function to be called. The first argument will be the success result of this Future. If the return value is true, the future succeeds with the original success result. If the return value is false, the future fails with an UNDEFINED result.

Parameter extra

Any extra context needed for fun. They will be provided as arguments two and onwards when the callback is called.

Returns

The new Future.

See also

transform()