Custom Query – LEMON

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Ticket	Owner	Reporter	Resolution	Summary
#22	Peter Kovacs	Alpar Juttner	fixed	Transplant error.h into hg main
Description	`error.h` is used by the most LEMON elements, therefore it is crucial to have it in hg repo as soon as possible.
#23	Balazs Dezso	Alpar Juttner	fixed	Arc/Node validity check in ListGraph (and in SmartGraph)
Description	The possibility of checking the validity of `Arc`, `Edge` and `Node` data structures are very important for creating proper language binding for scripting language. (A language binding must ensure that the user cannot crash the interpreter itself by a faulty code.) Using `SmartGraph`, it is easy to check it by checking if the item id is in the corresponding range For `ListGraph`, my suggestion would be to set the source of an edge to INVALID when it is deleted. It would cause quite little performance loss and then the validity could be checked in constant time.
#25	Peter Kovacs	Alpar Juttner	fixed	Unify the output of the test programs
Description	The rules on thumb: Print something to the output only if it really seems necessary. Check the validity of the results of the algorithms instead (using the `check()` macro). Do not print a message saying all test passed at the end of the output.

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