add and use Source::empty() since it can be done more efficiently than length(pos...
commite520a7a03ba62ddec0a5c990f8d01cb19f8097e9
authorpaul <paul@d708f5d6-7413-0410-9779-e7cbd77b26cf>
Thu, 24 Jun 2010 18:04:38 +0000 (24 18:04 +0000)
committerpaul <paul@d708f5d6-7413-0410-9779-e7cbd77b26cf>
Thu, 24 Jun 2010 18:04:38 +0000 (24 18:04 +0000)
tree85acac135bc98d73e392a6ac6cc21953cf1b3e58
parentc9eb54f29ee0c730b1d5d404349d98485af8078a
add and use Source::empty() since it can be done more efficiently than length(pos) == 0

git-svn-id: http://subversion.ardour.org/svn/ardour2/ardour2/branches/3.0@7300 d708f5d6-7413-0410-9779-e7cbd77b26cf
libs/ardour/ardour/audiosource.h
libs/ardour/ardour/midi_source.h
libs/ardour/ardour/source.h
libs/ardour/audiosource.cc
libs/ardour/file_source.cc
libs/ardour/midi_source.cc
libs/ardour/session_state.cc