Implementing generalized alternative construct for erasmus language

In this paper we describe the design and implementation of the generalized alternative construct for the Erasmus programming language. The alternative construct is a generalization of the familiar if-then-else statement that allows a process to non-deterministically choose between possible communications on several channels. Previous algorithms put restrictions on the use of the alternative construct that prevent both input/output operations to be used in an alternation. Our design removes previous restrictions on the use of the alternative construct. In order to support our design and to prove its correctness, we build models based on the ACP algebra, and we use the mCRL2 model checker to analyze and verify our models.