func ProcessFunc(f interface{}) (operators.UnFunc, error) {
	fntype := reflect.TypeOf(f)

	funcForm, err := isUnaryFuncForm(fntype)
	if err != nil {
		return nil, err
	}
	if funcForm == unaryFuncUnsupported {
		return nil, fmt.Errorf("unsupported unary func type")
	}

	fnval := reflect.ValueOf(f)

	return operators.UnFunc(func(ctx api.StreamContext, data interface{}) interface{} {
		result := callOpFunc(fnval, ctx, data, funcForm)
		return result.Interface()
	}), nil
}
// ProcessFunc returns a unary function which applies the specified
// user-defined function that processes data items from upstream and
// returns a result value. The provided function must be of type:
//   func(T) R
//   where T is the type of incoming item
//   R the type of returned processed item
ProcessFunc returns a unary function which applies the specified
user-defined function that processes data items from upstream and
returns a result value. The provided function must be of type:
func(T) R
where T is the type of incoming item
R the type of returned processed item
// ProcessFunc returns a unary function which applies the specified // user - defined function that processes data items from upstream and // returns a result value . The provided function must be of type : // func ( T ) R // where T is the type of incoming item // R the type of returned processed item
func ProcessFunc(f interface{}) (operators.UnFunc, error) {
	fntype := reflect.TypeOf(f)
	funcForm, err := isUnaryFuncForm(fntype)
	if err != nil {
		return nil, err
	}
	if funcForm == unaryFuncUnsupported {
		return nil, fmt.Errorf("unsupported unary func type")
	}
	fnval := reflect.ValueOf(f)
	return operators.UnFunc(func(ctx api.StreamContext, data interface{}) interface{} {
		result := callOpFunc(fnval, ctx, data, funcForm)
		return result.Interface()
	}), nil
}
func ProcessFunc ( f interface { } ) ( operators . UnFunc , error ) { fntype := reflect . TypeOf ( f ) funcForm , err := isUnaryFuncForm ( fntype ) if err != nil { return nil , err } if funcForm == unaryFuncUnsupported { return nil , fmt . Errorf ( " " ) } fnval := reflect . ValueOf ( f ) return operators . UnFunc ( func ( ctx api . StreamContext , data interface { } ) interface { } { result := callOpFunc ( fnval , ctx , data , funcForm ) return result . Interface ( ) } ) , nil }
ProcessFunc returns a unary function which applies the specified
user-defined function that processes data items from upstream and
returns a result value.
ProcessFunc returns a unary function which applies the specified user - defined function that processes data items from upstream and returns a result value .