change doEffect functions to use const& parameters

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

diff --git a/src/live_effects/lpe-perspective_path.cpp b/src/live_effects/lpe-perspective_path.cpp
index 923a4baa48a584c0d37b5e1c50efe4d047850841..1418f1892c71ae30b99e6fbd455293edc38a017b 100644 (file)
--- a/src/live_effects/lpe-perspective_path.cpp
+++ b/src/live_effects/lpe-perspective_path.cpp
@@ -66,7 +66,7 @@ LPEPerspectivePath::~LPEPerspectivePath()
 }
 
 Geom::Piecewise<Geom::D2<Geom::SBasis> >
-LPEPerspectivePath::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > & pwd2_in)
+LPEPerspectivePath::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
 {
     using namespace Geom;