From 8c53d0b70baa03c2b07360444a7cd0ad99bb8381 Mon Sep 17 00:00:00 2001
From: Joaquim <joaquim.org@gmail.com>
Date: Wed, 24 Feb 2021 19:40:24 +0000
Subject: Multi face support, analog clock, 12/24 config

---
 src/displayapp/screens/Screen.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'src/displayapp/screens/Screen.h')

diff --git a/src/displayapp/screens/Screen.h b/src/displayapp/screens/Screen.h
index 6b1d0eec..638dac99 100644
--- a/src/displayapp/screens/Screen.h
+++ b/src/displayapp/screens/Screen.h
@@ -7,6 +7,26 @@ namespace Pinetime {
   namespace Applications {
     class DisplayApp;
     namespace Screens {
+
+      template <class T>
+      class DirtyValue {
+        public:
+          DirtyValue() = default;                      // Use NSDMI
+          explicit DirtyValue(T const& v):value{v}{}   // Use MIL and const-lvalue-ref
+          bool IsUpdated() const { return isUpdated; }
+          T const& Get() { this->isUpdated = false; return value; }  // never expose a non-const lvalue-ref
+          DirtyValue& operator=(const T& other) {
+            if (this->value != other) {
+              this->value = other;
+              this->isUpdated = true;
+            }
+            return *this;
+          }
+        private:
+          T value{};            // NSDMI - default initialise type
+          bool isUpdated{true}; // NSDMI - use brace initilisation
+      };
+      
       class Screen {
         public:
           explicit Screen(DisplayApp* app) : app{app} {}
-- 
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