static inline int template_callback_bin(unpack_user* u, const char* b, const char* p, unsigned int l, msgpack_object* o)
{
    MSGPACK_UNUSED(u);
    MSGPACK_UNUSED(b);
    o->type = MSGPACK_OBJECT_BIN;
    o->via.bin.ptr = p;
    o->via.bin.size = l;
    u->referenced = true;
    return 0;
}

static inline int template_callback_ext(unpack_user* u, const char* b, const char* p, unsigned int l, msgpack_object* o)
{
    MSGPACK_UNUSED(u);
    MSGPACK_UNUSED(b);
    o->type = MSGPACK_OBJECT_EXT;
    o->via.ext.type = *p;
    o->via.ext.ptr = p + 1;
    o->via.ext.size = l - 1;
    u->referenced = true;
    return 0;
}

static inline int template_callback_uint64(unpack_user* u, uint64_t d, msgpack_object* o)
{
    MSGPACK_UNUSED(u);
    o->type = MSGPACK_OBJECT_POSITIVE_INTEGER;
    o->via.u64 = d;
    return 0;
}

static inline msgpack_object template_callback_root(unpack_user* u)
{
    MSGPACK_UNUSED(u);
    msgpack_object o;
    o.type = MSGPACK_OBJECT_NIL;
    return o;
}

static inline int template_callback_false(unpack_user* u, msgpack_object* o)
{
    MSGPACK_UNUSED(u);
    o->type = MSGPACK_OBJECT_BOOLEAN;
    o->via.boolean = false;
    return 0;
}

static inline int template_callback_double(unpack_user* u, double d, msgpack_object* o)
{
    MSGPACK_UNUSED(u);
    o->type = MSGPACK_OBJECT_DOUBLE;
    o->via.dec = d;
    return 0;
}

static inline int template_callback_float(unpack_user* u, float d, msgpack_object* o)
{
    MSGPACK_UNUSED(u);
    o->type = MSGPACK_OBJECT_FLOAT;
    o->via.f64 = d;
    return 0;
}

static inline int template_callback_array_item(unpack_user* u, msgpack_object* c, msgpack_object o)
{
    MSGPACK_UNUSED(u);
#if defined(__GNUC__) && !defined(__clang__)
    memcpy(&c->via.array.ptr[c->via.array.size], &o, sizeof(msgpack_object));
#else  /* __GNUC__ && !__clang__ */
    c->via.array.ptr[c->via.array.size] = o;
#endif /* __GNUC__ && !__clang__ */
    ++c->via.array.size;
    return 0;
}

static inline int template_callback_map_item(unpack_user* u, msgpack_object* c, msgpack_object k, msgpack_object v)
{
    MSGPACK_UNUSED(u);
#if defined(__GNUC__) && !defined(__clang__)
    memcpy(&c->via.map.ptr[c->via.map.size].key, &k, sizeof(msgpack_object));
    memcpy(&c->via.map.ptr[c->via.map.size].val, &v, sizeof(msgpack_object));
#else  /* __GNUC__ && !__clang__ */
    c->via.map.ptr[c->via.map.size].key = k;
    c->via.map.ptr[c->via.map.size].val = v;
#endif /* __GNUC__ && !__clang__ */
    ++c->via.map.size;
    return 0;
}

static inline int template_callback_int8(unpack_user* u, int8_t d, msgpack_object* o)
{
    MSGPACK_UNUSED(u);
    if(d >= 0) {
        o->type = MSGPACK_OBJECT_POSITIVE_INTEGER;
        o->via.u64 = (uint64_t)d;
        return 0;
    }
    else {
        o->type = MSGPACK_OBJECT_NEGATIVE_INTEGER;
        o->via.i64 = d;
        return 0;
    }
}

static inline int template_callback_nil(unpack_user* u, msgpack_object* o)
{
    MSGPACK_UNUSED(u);
    o->type = MSGPACK_OBJECT_NIL;
    return 0;
}