package serverevents

func CreateMetaDataFilter[T any](c IContext, metaDataSelector func(IContext) T, vgl func(a T, b T) bool) func(context IContext) bool {
	return func(context IContext) bool {
		metaA := metaDataSelector(c)
		metaB := metaDataSelector(context)
		return vgl(metaA, metaB)
	}
}

func MetadataAs[T any](context IContext, key string) (T, bool) {
	var v T
	tmp, ok := context.Get(key)
	if tmp == nil {
		return v, false
	}
	res, ok := tmp.(T)
	return res, ok
}