Add multiple callbacks

[fontanf]

Hi,

Is it possible to add multiple callbacks? It's not clear in the documentation
https://ergo-code.github.io/HiGHS/dev/callbacks/

I would like to have a MipImprovingSolution and a MipInterrupt callback, since I cannot interrupt from the MipImprovingSolution.

I tried to add a single callback and call startCallback for each callback type. But then I get this assert failing

HiGHS/highs/lp_data/HighsCallback.cpp

Lines 86 to 94 in 8c76346

	if (callback_type == kCallbackMipImprovingSolution ||
	callback_type == kCallbackMipSolution ||
	callback_type == kCallbackMipLogging ||
	callback_type == kCallbackMipGetCutPool ||
	callback_type == kCallbackMipDefineLazyConstraints ||
	callback_type == kCallbackMipUserSolution)
	assert(!action);
	return action;
	}

when I set user_interrupt = 1 when the callback is called because of MipImprovingSolution.

Is there a workaround?

[jajhall]

Yes, you provide a single callback function, and then start whichever callbacks you want.

I'll look at your other point later