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I disagree, because side effects in an assert would always be a code smell, but placing slow code in there is useful behavior. The line could have easily been:

assert EnsureUnique( obj )

Which runs through the program's data structures to ensure that nothing else matches a property of obj in some way.

Hacky, slow, but very useful to keep around if you have a constraint like that. But if you run it in release mode with production sized data sets, it'll slow to a crawl if you don't cut out the entire check.




I wouldn't rely on assert code for this, better say "if dataset is huge don't check".




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