Returns if variable or constraint names are used.
unsigned char is_use_names(lprec *lp, unsigned char isrow);
is_use_names returns a boolean value indicating if variable or constraint names
Set to FALSE (0) if column information is needed and TRUE (1) if row information is needed.
When a model is read from file or created via the API, variables and constraints can be named.
These names are used to report information or to save the model in a given format.
However, sometimes it is required to ignore these names and to use the internal names of lp_solve.
This is for example the case when the names do not comply to the syntax rules of the format that
will be used to write the model to.