Iterators to different containers problem

Hi,

I have been struggling with finding a solution to my program.

I have an expression tree which contains nodes which have std::set as there data member.

I am trying to use the set_union() function to return a union of the sets, but since the set_union() function parameters point to different containers, I get a runtime error:

Quote:

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Debug assertion failed. Expression map/set iterators incompatible

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I have been Googling, and it seems other people have had similar problems, and so I come here to ask for advice on how I should go about solving the issue..

Would really appreciate some advice on how I can overcome this issue, been stuck for a couple of days now and seem to be getting no where.

Many thanks.

Your get_setnodemember returns a set by value, so everytime you call it makes a separate copy. Thus:
nodea->get_setnodemember().begin(), // begin called on one copy of the set
nodea->get_setnodemember().end(), // end called on a completely different, iterator incompatible copy of the set

Hey thanks ever so much adey, sorted it!

:)