change doEffect functions to use const& parameters

[inkscape.git] / src / live_effects / lpe-skeleton.cpp

diff --git a/src/live_effects/lpe-skeleton.cpp b/src/live_effects/lpe-skeleton.cpp
index a2c4cf1fbbf362fd45689bcbbbf57d97b60acc47..571503d8e0df77172950aac550ee69af9a67500b 100644 (file)
--- a/src/live_effects/lpe-skeleton.cpp
+++ b/src/live_effects/lpe-skeleton.cpp
@@ -83,7 +83,7 @@ LPESkeleton::doEffect_path (std::vector<Geom::Path> & path_in)
 */
 
 Geom::Piecewise<Geom::D2<Geom::SBasis> >
-LPESkeleton::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > & pwd2_in)
+LPESkeleton::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
 {
     Geom::Piecewise<Geom::D2<Geom::SBasis> > output;