public static LinearExpr RebuildLinearExprFromLinearExpressionProto(LinearExpressionProto proto,
CpModelProto model)
{
int numElements = proto.Vars.Count;
long offset = proto.Offset;
if (numElements == 0)
{
return(LinearExpr.Constant(offset));
}
else
if (numElements == 1)
{
IntVar var = new IntVar(model, proto.Vars[0]);
long coeff = proto.Coeffs[0];
return(LinearExpr.Affine(var, coeff, offset));
}
else
{
LinearExpr[] exprs = new LinearExpr[numElements];
for (int i = 0; i < numElements; ++i)
{
IntVar var = new IntVar(model, proto.Vars[i]);
long coeff = proto.Coeffs[i];
exprs[i] = Prod(var, coeff);
}
SumArray sum = new SumArray(exprs);
sum.Offset = sum.Offset + offset;
return(sum);
}
}
internal static LinearExpr RebuildLinearExprFromLinearExpressionProto(LinearExpressionProto proto,
CpModelProto model)
{
int numElements = proto.Vars.Count;
long offset = proto.Offset;
if (numElements == 0)
{
return(LinearExpr.Constant(offset));
}
else if (numElements == 1)
{
IntVar var = new IntVar(model, proto.Vars[0]);
long coeff = proto.Coeffs[0];
return(LinearExpr.Affine(var, coeff, offset));
}
else
{
LinearExprBuilder builder = LinearExpr.NewBuilder(numElements);
for (int i = 0; i < numElements; ++i)
{
builder.AddTerm(new IntVar(model, proto.Vars[i]), proto.Coeffs[i]);
}
builder.Add(offset);
return(builder);
}
}
internal LinearExpr GetLinearExpr <X>(X x)
{
if (typeof(X) == typeof(IntVar))
{
return((IntVar)(Object)x);
}
if (typeof(X) == typeof(long) || typeof(X) == typeof(int) || typeof(X) == typeof(short))
{
return(LinearExpr.Constant(Convert.ToInt64(x)));
}
if (typeof(X) == typeof(LinearExpr))
{
return((LinearExpr)(Object)x);
}
throw new ArgumentException("Cannot convert argument to LinearExpr");
}
