Prefer const references for Pin/Channel maps
authorRobin Gareus <robin@gareus.org>
Sun, 4 Nov 2018 02:25:36 +0000 (03:25 +0100)
committerRobin Gareus <robin@gareus.org>
Sun, 4 Nov 2018 02:25:36 +0000 (03:25 +0100)
commit8d6d0b323268fc779e796e36a4ad69d2ca965324
treeb4d3ebb4a3140b8dc9fba20ea2bbef9307c1745e
parente4c7cb1e750f835854797d0b765353f187e9f148
Prefer const references for Pin/Channel maps

Another micro-optmization shaving off some ten microseconds for every
plugin. Also copying maps isn't RT-safe.

This may however cause issue if const map references can change
while a plugin is running.
libs/ardour/plugin_insert.cc