private VCExpr MakeBinary(VCExprOp op, VCExpr [] args)
{
if (args.Count() == 0)
{
// with zero args we need the identity of the op
if (op == VCExpressionGenerator.AndOp)
return VCExpressionGenerator.True;
if (op == VCExpressionGenerator.OrOp)
return VCExpressionGenerator.False;
if (op == VCExpressionGenerator.AddIOp)
{
Microsoft.Basetypes.BigNum x = Microsoft.Basetypes.BigNum.ZERO;
return gen.Integer(x);
}
HandleProverError("Prover error: bad expression ");
throw new BadExprFromProver();
}
var temp = args[0];
for (int i = 1; i < args.Count(); i++)
temp = gen.Function(op, temp, args[i]);
return temp;
}
