public CLS_Content.Value ComputeValue(CLS_Content content)
{
content.InStack(this);
CLS_Content.Value right = listParam[0].ComputeValue(content);
ICLS_Type type = content.environment.GetType(right.type);
CLS_Content.Value value = new CLS_Content.Value();
value.type = targettype;
value.value = type.ConvertTo(content, right.value, targettype);
content.OutStack(this);
return value;
}