1 files changed, 5 insertions, 5 deletions

diff --git a/meowpp/gra/Eye.h b/meowpp/gra/Eye.h
index 0d62892..cff5ccd 100644
--- a/meowpp/gra/Eye.h
+++ b/meowpp/gra/Eye.h
@@ -57,7 +57,7 @@ public:
     return *this;
   }
 
-  Camera<Pixel> const& camera() const {
+  Camera<Pixel> camera() const {
     return self->cam_;
   }
 
@@ -65,12 +65,12 @@ public:
     return self()->cam_;
   }
 
-  Camera<Pixel> const& camera(Camera<Pixel> const& c) {
+  Camera<Pixel> camera(Camera<Pixel> const& c) {
     self()->cam_.copyFrom(c);
     return camera();
   }
 
-  Vector3D<double> const& offset() const {
+  Vector3D<double> offset() const {
     return self->ofs_;
   }
 
@@ -78,7 +78,7 @@ public:
     return self()->ofs_;
   }
 
-  Vector3D<double> const& offset(Vector3D<double> const& ofs) {
+  Vector3D<double> offset(Vector3D<double> const& ofs) {
     self()->ofs_ = ofs;
     return offset();
   }
@@ -149,7 +149,7 @@ public:
    *  @return this
    */
   ObjBase* copyFrom(ObjBase const* b) {
-    return &(copyFrom(*(Eye*)b));
+    return &(copyFrom(*(Eye const*)b));
   }
 
   /*! @brief 回傳class的type