SWITCH

From ASCEND

The SWITCH statement is used to perform logical branching within METHODs. This, for example, allows a model to be initialised in different ways, depending on the value of certain variables in the model. Using SWITCH is one way of doing limited conditional modelling without a conditional solver like CMSlv.

From the user's manual:

Essentially roughly equivalent to the C switch statement, except that ASCEND allows wildcard matches, allows any number of controlling variables to be given in a list, and assumes BREAK at the end of each CASE.

An example from models/ben/benHGthermo.a4l:

METHOD specify;
	RUN td_homogeneous_mixture::specify;
	SWITCH (options.mixture_thermo_correlation)
	CASE 'UNIFAC':
		FREE partial[ds.components].V;
		FREE partial[ds.components].H;
		FREE partial[ds.components].G;
	CASE 'Wilson':
		FREE partial[ds.components].V;
		FREE partial[ds.components].H;
		FREE partial[ds.components].G;
	END SWITCH;
END specify;