This is the same function as swapsTestOuter(),įunc swapsTestInnerSlow(_ repeats: Int) A class holding an array that does subscript operations on it 003 vs 16) when run with swift -O or -Ounchecked. The difference is even more extreme (5000x. Running test 'Int array swaps slow (and is SLOW!)': Running test 'Int array swaps slow (but still fast)': The following is the output from the below sample code: (The sample code below doesn't include these tests, but one can easily modify it.) Using a UnsafeMutablePointer does also solve the problem. If the array is global, this doesn't happen. This problem seems to only happen if this array and functionality are encapsulated in a class. This class implements both the fast and slow methods for the following performance tests. Needing to use an inout reference is unexpected. Performing these simple array subscript (get and set) operations directly on the encapsulated member variable array, and if that array type is of some class, performance is 30 times worse than swapping elements using an inout reference or using an int array.
The following code has a class, which contains an array, and a method that swaps elements of the array. I continued to debug the problem and created the following test code to illustrate the core issue so as to ignore any implementation details of a min heap. I first discovered this problem when implementing a min heap backed by an array in order to solve a Leetcode problem. We look forward to hearing from you soon. Thank you for your time and consideration. We highly value your expertise in this area and would greatly appreciate your guidance on whether our proposed app would comply with the App Store Guidelines. Its purpose is to help people quit smoking and decrease their nicotine intake. However, we want to clarify that our app would not promote these behaviors, but instead work to counteract them. We understand that App Store Guidelines prohibit "Apps that encourage consumption of tobacco and vape products, illegal drugs, or excessive amounts of alcohol". We firmly believe that our app can make a significant positive impact on public health, and we are committed to ensuring that it fully complies with all App Store Guidelines. Our app is focused on helping adult smokers quit smoking by offering personalized cessation plans and a companion device that gradually reduces nicotine intake. I am reaching out to inquire about the App Store Guidelines in relation to an app that my team and I are developing.
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