renderbug/src/Static.h

#pragma once
#include "Platform.h"

// Utility class mostly for when certain inputs need singleton callback handlers
template<typename T> class Static {
public:
    static T* instance() {
        return s_instance;
    }
private:
    static T* s_instance;
};

template<typename T> struct StaticTaskRegistration : public Platform::TaskRegistration {
  StaticTaskRegistration() : Platform::TaskRegistration(Static<T>::instance()) {
    Platform::registerTask(this);
  }
};

struct AutoTaskRegistration : public Platform::TaskRegistration {
  explicit AutoTaskRegistration(Task* task) : Platform::TaskRegistration(task) {
    Platform::registerTask(this);
  }
};

#define NAMED_STATIC_ALLOC(Cls, StaticName) static Cls _staticAlloc__ ## StaticName;\
                          template<> Cls* Static<Cls>::s_instance=&_staticAlloc__ ## StaticName;

#define STATIC_ALLOC(Cls) NAMED_STATIC_ALLOC(Cls, Cls)

#define NAMED_STATIC_TASK(Cls, StaticName) static StaticTaskRegistration<Cls> _staticTask_ ## StaticName;
#define STATIC_TASK(Cls) NAMED_STATIC_TASK(Cls, Cls)

#define REGISTER_TASK(TaskName)  static AutoTaskRegistration _autoTask__ ## TaskName(&TaskName);