[redland-dev] [Redland librdf RDF API 0000478]: Object returned from librdf_stream_get_object must be copied, but may not copiable

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
====================================================================== 
http://bugs.librdf.org/mantis/view.php?id=478 
====================================================================== 
Reported By:                normang
Assigned To:                
====================================================================== 
Project:                    Redland librdf RDF API
Issue ID:                   478
Category:                   api
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     new
====================================================================== 
Date Submitted:             2011-10-29 19:30
Last Modified:              2011-10-29 19:30
====================================================================== 
Summary:                    Object returned from librdf_stream_get_object must
be copied, but may not copiable
Description: 
The documentation for librdf_stream_get_object says:

This method returns a SHARED pointer to the current statement object which
should be copied by the caller to preserve it if the stream is moved on
librdf_stream_next or if it should last after the stream is closed.

The obvious function to copy this is librdf_new_statement_from_statement, which
says:

Copy constructor - create a new librdf_statement from an existing
librdf_statement.

However, the 'copy' which this returns is not an independent copy, but, via
raptor_statement_copy, merely the original statement with an incremented usage
count (unless the input statement is static (usage < 0); see
raptor_statement_copy in
https://github.com/dajobe/raptor/blob/master/src/raptor_statement.c), and this
is confirmed by printing out pointers and usage counts of the statement returned
from librdf_new_statement_from_statement.