constify interfaces

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/ST_cythonize@2203 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: 55cf020d2a7989dc4e7125bcf6f91443aad4dda1

1 files changed, 1 insertions, 1 deletions

diff --git a/src/cython/include/Strong_witness_complex_interface.h b/src/cython/include/Strong_witness_complex_interface.h
index 5081ec2d..70e78a2a 100644
--- a/src/cython/include/Strong_witness_complex_interface.h
+++ b/src/cython/include/Strong_witness_complex_interface.h
@@ -42,7 +42,7 @@ class Strong_witness_complex_interface {
   using Nearest_landmark_table = std::vector<Nearest_landmark_range>;
 
  public:
-  Strong_witness_complex_interface(Nearest_landmark_table& nlt) {
+  Strong_witness_complex_interface(const Nearest_landmark_table& nlt) {
     witness_complex_ = new Strong_witness_complex<Nearest_landmark_table>(nlt);
   }