staticstack: Move to src/utility

Author: FintasticMan

src/StaticStack.h

@@ -19,7 +19,7 @@
 #include "displayapp/Messages.h"
 #include "BootErrors.h"
 
-#include "StaticStack.h"
+#include "utility/StaticStack.h"
 
 namespace Pinetime {
 
@@ -126,8 +126,8 @@ namespace Pinetime {
       void ApplyBrightness();
 
       static constexpr size_t returnAppStackSize = 10;
-      StaticStack<Apps, returnAppStackSize> returnAppStack;
-      StaticStack<FullRefreshDirections, returnAppStackSize> appStackDirections;
+      Utility::StaticStack<Apps, returnAppStackSize> returnAppStack;
+      Utility::StaticStack<FullRefreshDirections, returnAppStackSize> appStackDirections;
 
       bool isDimmed = false;
     };

src/displayapp/DisplayApp.h

@@ -0,0 +1,47 @@
+#include <array>
+#include <cstddef>
+
+namespace Pinetime {
+  namespace Utility {
+    template <typename T, size_t N>
+    class StaticStack {
+    public:
+      T Pop();
+      void Push(T element);
+      void Reset();
+      T Top();
+
+    private:
+      std::array<T, N> elementArray;
+      // Number of elements in stack, points to the next empty slot
+      size_t stackPointer = 0;
+    };
+
+    // Returns random data when popping from empty array.
+    template <typename T, size_t N>
+    T StaticStack<T, N>::Pop() {
+      if (stackPointer > 0) {
+        stackPointer--;
+      }
+      return elementArray[stackPointer];
+    }
+
+    template <typename T, size_t N>
+    void StaticStack<T, N>::Push(T element) {
+      if (stackPointer < elementArray.size()) {
+        elementArray[stackPointer] = element;
+        stackPointer++;
+      }
+    }
+
+    template <typename T, size_t N>
+    void StaticStack<T, N>::Reset() {
+      stackPointer = 0;
+    }
+
+    template <typename T, size_t N>
+    T StaticStack<T, N>::Top() {
+      return elementArray[stackPointer - 1];
+    }
+  }
+}