feature.h

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#ifndef HAWKTRACER_FEATURE_H
#define HAWKTRACER_FEATURE_H

#include <hawktracer/macros.h>
#include <hawktracer/base_types.h>
#include <hawktracer/alloc.h>

HT_DECLS_BEGIN

typedef struct _HT_Feature HT_Feature;

typedef void (*HT_FeatureDestroy)(HT_Feature* feature);

typedef struct
{
    HT_FeatureDestroy destroy;

    /* <private readonly> */
    uint32_t id;
} HT_FeatureKlass;

struct _HT_Feature
{
    HT_FeatureKlass* klass;
};

#define HT_FEATURE_DEFINE(TYPE_NAME, DESTROY_FNC) \
    static HT_FeatureKlass* TYPE_NAME ## _get_class(void) { \
        static HT_FeatureKlass feature_klass = { DESTROY_FNC, HT_INVALID_FEATURE_ID }; \
        return &feature_klass; \
    } \
    static TYPE_NAME* TYPE_NAME ## _alloc(void) { \
        TYPE_NAME* feature = HT_CREATE_TYPE(TYPE_NAME); \
        if (feature) { \
            ((HT_Feature*)feature)->klass = TYPE_NAME ## _get_class(); \
        } \
        return feature; \
    } \
    static HT_INLINE TYPE_NAME* TYPE_NAME ## _from_timeline(HT_Timeline* timeline) { \
        return ((TYPE_NAME*)ht_timeline_get_feature(timeline, TYPE_NAME ## _get_class())); \
    } \
    HT_ErrorCode TYPE_NAME ## _register(void) { \
        return ht_registry_register_feature(TYPE_NAME ## _get_class()); \
    }

HT_DECLS_END

#endif /* HAWKTRACER_FEATURE_H */