public CLS_Content.Value ComputeValue(CLS_Content content)
{
content.InStack(this);
CLS_Content.Value left = listParam[0].ComputeValue(content);
CLS_Content.Value right = listParam[1].ComputeValue(content);
CLS_Content.Value result = new CLS_Content.Value();
result.value = content.environment.GetType(left.type).Math2Value(content, mathop, left.value, right, out result.type);
content.OutStack(this);
return result;
}