[Coin-discuss] User exit tests in Cbc?

[acw at ascent.com]

Our application using COIN/Cbc is going very well.  We have successfully 
ported to Windows and integrated an only-slightly-tweaked Cbc solver with 
the rest of our application.

Recently, however, we encountered a case for which the solver ran out of 
memory and crashed ignominiously in the middle of a run.  (In the 
benighted world of 32-bit Windows, a process's address space is limited to 
about 2Gb.)  We are, therefore, adding an extra exit test to the main loop 
in CbcModel::branchAndBound.  It isn't very tricky.  But we would like to 
do it without modifying CbcModel.cpp any more than is absolutely 
necessary, so that we can stay synchronized with the main-branch sources 
as easily as possible.  So this led us to consider adding a little user 
hook to the exit tests.  Perhaps just after "!stoppedOnGap && 
!eventHappened" we could add "&& !userExitTest()".

Have the Cbc developers considered making this kind of user exit hook 
available?  What would you consider the most "Cbc-y" way to do it?

Thanks for your thoughts.
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