Cycles in family tree software

Cycles in family tree software Asked 10 years, 1 month ago Active 5 years, 11 months ago Viewed 265k times 1593 votes 572 Locked. This question and its answers are locked because the question is off-topic but has historical significance. It is not currently accepting new answers or interactions. I am the developer of some family tree software (written in C++ and Qt). I had no problems until one of my customers mailed me a bug report. The problem is that the customer has two children with their own daughter, and, as a result, he can't use my software because of errors. Those errors are the result of my various assertions and invariants about the family graph being processed (for example, after walking a cycle, the program states that X can't be both father and grandfather of Y). How can I resolve those errors without removing all data assertions?

На скриншоте вопрос с Stack Overflow о программе для составления семейного древа. Пользователь сообщает, что клиент имеет двух детей от собственной дочери, из-за чего граф семьи содержит цикл, а программа не может одновременно считать его отцом и дедом одного человека. Шутка строится на абсурдном инцесте и на том, что математически корректные проверки программы сталкиваются с невозможной с точки зрения обычного генеалогического древа семейной структурой. EN: The screenshot shows a Stack Overflow question about family-tree software. The user says that a customer has two children with his own daughter, creating a cycle in the family graph, so the program cannot treat him as both a father and a grandfather of the same person. The joke comes from the absurd incestuous genealogy and from mathematically valid program checks colliding with a family structure that is impossible for an ordinary family tree.

• @ithueti / 4419 2021-07-22