René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"SoftwareSerial bug - local variable, dangling pointer","articleBody":"I look at [this code](https://github.com/avaldebe/PMserial/blob/98ccdffcfd50219e522fd0830552d082bae824e7/src/PMserial.h#L88) and see an error ([explain in cppreference](https://en.cppreference.com/w/cpp/language/reference#Dangling_references)).\r\nThe variable `serial` is local (in stack), its lifetime is limited to the area of the constructor. After exiting the constructor, the variable `serial` will be destroyed,  and the variable `uart` will contain [dangling pointer](https://en.wikipedia.org/wiki/Dangling_pointer). Copying its address should not prolong the lifetime.\r\n\r\nI tried looking for some special case that affects the lifetime of a variable and which will not be \"undefined behavior\" ([0](https://en.cppreference.com/w/cpp/language/lifetime), [1](https://en.cppreference.com/w/cpp/language/reference#Dangling_references), [2](https://en.cppreference.com/w/cpp/language/reference_initialization#Lifetime_of_a_temporary), [3](https://stackoverflow.com/questions/22114751/returning-static-pointer-to-local-variable-from-function), [4](https://qna.habr.com/q/246744), [5](https://habr.com/ru/company/jugru/blog/469465/), [6](https://habr.com/ru/post/186790/) ). But I couldn't find anything suitable for this code...\r\n\r\nIf my fears are in vain, please give me a link to a description of this case in the standard or explain how it works.\r\n\r\nProblem code:\r\n```\r\nclass SerialPM\r\n{\r\nprotected:\r\n  Stream *uart;  // hardware/software serial\r\n....\r\n\r\n  SerialPM(PMS sensor, uint8_t rx, uint8_t tx) : pms(sensor)\r\n  {\r\n    SoftwareSerial serial(rx, tx);\r\n    uart = \u0026serial;\r\n    hwSerial = false;\r\n  }\r\n```\r\n","author":{"url":"https://github.com/heX16","@type":"Person","name":"heX16"},"datePublished":"2021-02-28T23:36:28.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/19/PMserial/issues/19"}