[PATCH 5/6] c++: fix position operator signatures

[Akim Demaille]

* data/location.cc (operator+=, operator-=): Remove const from return
type.
---
 data/location.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/data/location.cc b/data/location.cc
index 92b6d09..49f5f34 100644
--- a/data/location.cc
+++ b/data/location.cc
@@ -87,7 +87,7 @@ b4_copyright([Positions for Bison parsers in C++],
   };
 
   /// Add and assign a position.
-  inline const position&
+  inline position&
   operator+= (position& res, const int width)
   {
     res.columns (width);
@@ -103,7 +103,7 @@ b4_copyright([Positions for Bison parsers in C++],
   }
 
   /// Add and assign a position.
-  inline const position&
+  inline position&
   operator-= (position& res, const int width)
   {
     return res += -width;
-- 
1.8.0