jp2_input_box::has_caching_source

Indicates whether or not the ultimate source of data is a kdu_cache object, which was used to open the jp2_family_src object passed into the present object's open function. This information can be useful, since the behaviour of a number of other functions can differ if the ultimate source of data is a cache. In particular, an incomplete cache may cause a function to fail (e.g. return false) even though it will later be able to succeed when the cache contents have been augmented.