/// <summary>
/// Replaces the implementation of this existential function with the one given by the procided decision tree (without categorical split nodes)
/// and returns whether the implmentation has changed.
/// </summary>
/// <param name="node">The root of a decision tree</param>
/// <param name="attr2Expr">The mapping of attribute names to expressions</param>
/// <returns>true if the implmentation has changed and false otherwise</returns>
private bool constructModel(TreeNode node, Dictionary <string, Expr> attr2Expr)
{
// Remember old implementation
Expr oldmodel = model;
// Get new implementation
if (node == null)
{
model = Expr.False;
}
else
{
model = node.constructBoogieExpr(attr2Expr);
}
return(!ExtendsExpr.EqualityComparer(model, oldmodel));
}
/// <summary>
/// Returns the implementation of the model where the formal parameters (the variables) are substituted with newvars.
/// </summary>
/// <param name="newvars">The variables used to replace the old variables with</param>
/// <returns></returns>
public Expr Gamma(List <Expr> newvars)
{
return(ExtendsExpr.replace(model, vars, newvars));
}