From 616aa91b4c373dd49e60ac8b6b5c942ebc5804c9 Mon Sep 17 00:00:00 2001
From: Finlay Davidson <finlay.davidson@coderclass.nl>
Date: Thu, 16 Mar 2023 22:08:51 +0100
Subject: dirtyvalue: Move to src/utility

---
 src/utility/DirtyValue.h | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 src/utility/DirtyValue.h

(limited to 'src/utility')

diff --git a/src/utility/DirtyValue.h b/src/utility/DirtyValue.h
new file mode 100644
index 00000000..8d5147aa
--- /dev/null
+++ b/src/utility/DirtyValue.h
@@ -0,0 +1,39 @@
+#pragma once
+
+namespace Pinetime {
+  namespace Utility {
+    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() {
+        if (this->isUpdated) {
+          this->isUpdated = false;
+          return true;
+        }
+        return false;
+      }
+
+      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 initialisation
+    };
+  }
+}
-- 
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