Added more extensions.

Sources/SwiftBoost/CoreGraphics/Extensions/CGFloatExtension.swift

@@ -0,0 +1,11 @@
+#if canImport(CoreGraphics)
+import CoreGraphics
+
+extension CGFloat {
+
+    public func rounded(to places: Int) -> CGFloat {
+        let divisor = pow(10.0, CGFloat(places))
+        return (self * divisor).rounded() / divisor
+    }
+}
+#endif

Sources/SwiftBoost/Foundation/Extensions/ArrayExtension.swift

@@ -49,3 +49,10 @@ public extension Array where Element: Equatable {
         return result
     }
 }
+
+public extension ArraySlice {
+
+    var array: [Element] {
+        return Array(self)
+    }
+}

Sources/SwiftBoost/Foundation/Extensions/NotificationCenterExtension.swift

@@ -1,8 +1,14 @@
 import Foundation
 
-public extension NotificationCenter {
+extension NotificationCenter {
 
-    func post(name: NSNotification.Name) {
+    public func addObserver(_ names: NSNotification.Name..., using block: @escaping @Sendable (Notification) -> Void) {
+        for name in names {
+            NotificationCenter.default.addObserver(forName: name, object: nil, queue: nil, using: block)
+        }
+    }
+
+    public func post(name: NSNotification.Name) {
         post(name: name, object: nil)
     }
 }