kCFNumberSInt64Type

kCFNumberSInt64Type is a constant defined in the Core Foundation framework of Apple's operating systems, including macOS, iOS, and tvOS. It represents a signed 64-bit integer data type. This constant is used in conjunction with the CFNumberRef opaque type, which serves as a generic container for numerical values within Core Foundation.

When you create a CFNumber object to hold a signed 64-bit integer, you specify kCFNumberSInt64Type as the type identifier. This allows the CFNumber object to correctly interpret and store the data. For instance, when converting data between different formats or when passing numerical values to APIs that expect a CFNumber, explicitly indicating kCFNumberSInt64Type ensures type safety and correct data handling.

Common operations involving kCFNumberSInt64Type include creating CFNumber objects from C-level 64-bit integer variables (such as `int64_t`) and retrieving the underlying 64-bit integer value from a CFNumber object. This is particularly useful in scenarios where you need to work with large integer values that exceed the capacity of smaller integer types like `int` or `long`. The use of kCFNumberSInt64Type guarantees that the full range of a signed 64-bit integer can be represented and manipulated.