InfiniTime.git

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#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];
    }
  }
}