/// <summary>
/// A default implementation of the <see cref="CheckVariableDisequality"/> given
/// the appropriate expression factories by calling CheckPredicate.
/// </summary>
protected Answer DefaultCheckVariableDisequality(IPropExprFactory /*!*/ propExprFactory, IValueExprFactory /*!*/ valExprFactory, Element /*!*/ e, IVariable /*!*/ var1, IVariable /*!*/ var2)
{
Contract.Requires(propExprFactory != null);
Contract.Requires(valExprFactory != null);
Contract.Requires(e != null);
Contract.Requires(var1 != null);
Contract.Requires(var2 != null);
return(this.CheckPredicate(e, propExprFactory.Not(valExprFactory.Eq(var1, var2))));
}
private Element /*!*/ ApplyCombineNameMap(Element /*!*/ e, ICombineNameMap /*!*/ eToResult)
{
Contract.Requires(eToResult != null);
Contract.Requires(e != null);
Contract.Ensures(Contract.Result <Element>() != null);
Element /*!*/ result = e;
foreach (G.KeyValuePair <IVariable /*!*/, ISet /*<IVariable!>*//*!*/> entry in eToResult.GetSourceToResult())
{
IVariable /*!*/ sourceName = entry.Key;
Contract.Assert(sourceName != null);
ISet /*<IVariable!*//*!*/ resultNames = entry.Value;
Contract.Assert(resultNames != null);
// Renaming s to r is okay if
// (1) s is not used in the result
// and (2) s has not been renamed already
bool renameOkay = !resultNames.Contains(sourceName);
IVariable /*!*/ representative = sourceName;
Contract.Assert(representative != null);
foreach (IVariable /*!*/ rname in resultNames)
{
Contract.Assert(rname != null);
// skip if sourceName and rname are the same
if (object.Equals(sourceName, rname))
{
continue;
}
if (renameOkay)
{
result = this.Rename(result, sourceName, rname);
representative = rname; // representative now rname
renameOkay = false; // no longer okay to rename
}
else
{
result = this.Constrain(result, valueExprFactory.Eq(representative, rname));
}
}
}
return(result);
}
/// <summary>
/// A default implementation of the <see cref="CheckVariableDisequality"/> given
/// the appropriate expression factories by calling CheckPredicate.
/// </summary>
protected Answer DefaultCheckVariableDisequality(IPropExprFactory/*!*/ propExprFactory, IValueExprFactory/*!*/ valExprFactory, Element/*!*/ e, IVariable/*!*/ var1, IVariable/*!*/ var2) {
Contract.Requires(propExprFactory != null);
Contract.Requires(valExprFactory != null);
Contract.Requires(e != null);
Contract.Requires(var1 != null);
Contract.Requires(var2 != null);
return this.CheckPredicate(e, propExprFactory.Not(valExprFactory.Eq(var1, var2)));
}