On Mon, 2012-02-13 at 14:26 -0800, stephenju wrote: > Just went through the source files and find it actually makes 4 copies of the > text. > > MarshallingSupport::readString32() makes 1 from the stream. > ActiveMQTextMessage::getText() then make another one to store in its data > member. Then it makes yet another one as return value. Finally, the > assignment in my code makes one for itself. > > Maybe I count them wrong? :) > C++ String object uses a reference counted design so the copies are lightweight copies internally they all point to the same data until a mutating operation is performed. Most modern compilers will also optimize the return by using RVO and NRVO to eliminate the use of a temporary.
> -- > View this message in context: > http://activemq.2283324.n4.nabble.com/ActiveMQ-CPP-Getting-text-from-a-Text-Message-without-making-temporary-tp4384039p4385547.html > Sent from the ActiveMQ - User mailing list archive at Nabble.com. -- Tim Bish Sr Software Engineer | FuseSource Corp tim.b...@fusesource.com | www.fusesource.com skype: tabish121 | twitter: @tabish121 blog: http://timbish.blogspot.com/
