layer_stack.h

#pragma once
 
#include <algorithm>
#include <memory>
#include <vector>
 
namespace pixelbullet
{
class Layer;
 
class LayerStack
{
public:
    LayerStack() = default;
    ~LayerStack();
 
    void PushLayer(std::unique_ptr<Layer> layer);
    void PushOverlay(std::unique_ptr<Layer> overlay);
    void PopLayer(Layer* layer);
    void PopOverlay(Layer* overlay);
 
    const std::vector<std::unique_ptr<Layer>>& GetLayers() const
    {
        return layers_;
    }
    std::vector<std::unique_ptr<Layer>>& GetLayers()
    {
        return layers_;
    }
 
private:
    std::vector<std::unique_ptr<Layer>> layers_;
    unsigned int layer_insert_index_ = 0;
};
} // namespace pixelbullet