Post #860854

Tip 95 of #TuesdayCodingTips - Copy & swap idiom Rule of 5 says that if you need to implement one of the copy/move constructors/assignment operators or a destructor, you shall implement all of them to avoid resource management issues. However, this often leads to duplicated code and subtle issues, such as a class being move-assigned onto itself. Copy & swap idiom helps deduplicate the code by implementing assignment operators in terms of creating a temporary copy of the source object and swapping its contents with the target object. On top of base copy & swap, one can even merge the two assignment operator methods into a single one, further reducing the amount of code needed. Unfortunately, this òften comes at the cost of the move-assignment operation no longer being `noexcept`, thus preventing many standard containers from using the most effective relocation strategies. #cpp #tips #programming