Forum Discussion
Const correctness and thread safety in the C-API
How do I know : Which functions can be considered const i.e leave the XPRSprob in an unaltered state ? Which functions are thread safe ? (I am in particular interested in knowing if XPRSbtran and...
Hi Bo,
note that a prob does not only describe the problem to be solved. It also describes the environment/context in which the problem is solved. In particular, it carries the last error code and last error message (see XPRSgetlaserror, for example). Since this may change for any XPRS function, the prob itself can never be const.
Once could probably introduce a notion of "conceptually constant" but that would not be very clear cut and would also not be something that one would enforce by using the `const` keyword.