Add memory usage to demo

kaishin · Jan 2, 2024 · 92abae0 · 92abae0
1 parent b2b4ee7
commit 92abae0
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/Demo/Demo-iOS/ViewController.swift b/Demo/Demo-iOS/ViewController.swift
@@ -61,8 +61,12 @@ class ViewController: UIViewController {
 }
 
 class Memory: NSObject {
+  // From Quinn the Eskimo at Apple.
   // https://forums.developer.apple.com/thread/105088#357415
+
   class func memoryFootprint() -> Int? {
+    // The `TASK_VM_INFO_COUNT` and `TASK_VM_INFO_REV1_COUNT` macros are too
+    // complex for the Swift C importer, so we have to define them ourselves.
     let TASK_VM_INFO_COUNT = mach_msg_type_number_t(MemoryLayout<task_vm_info_data_t>.size / MemoryLayout<integer_t>.size)
     let TASK_VM_INFO_REV1_COUNT = mach_msg_type_number_t(MemoryLayout.offset(of: \task_vm_info_data_t.min_address)! / MemoryLayout<integer_t>.size)