NSDataReadingMapped

NSDataReadingMapped is a constant used in the context of reading data from a file in iOS and macOS development. It is part of the NSDataReadingOptions enumeration, which provides options for reading data from a file or URL. When NSDataReadingMapped is specified, the data is read into memory using memory mapping, a technique that allows the operating system to map a file or device into memory. This can be more efficient than reading the data directly, especially for large files, as it avoids the need to copy the data into a buffer. However, it is important to note that memory-mapped files can have higher latency for small reads and writes, and they require careful management to avoid memory leaks or other issues. NSDataReadingMapped is typically used in conjunction with other options, such as NSDataReadingUncached, to fine-tune the behavior of the data reading operation.