Try to fix operator< for std::sort on CentOS

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/trunk@3332 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: caaeb02c38a8adc8c09321e534f9b73181450acf

1 files changed, 2 insertions, 6 deletions

diff --git a/src/common/include/gudhi/writing_persistence_to_file.h b/src/common/include/gudhi/writing_persistence_to_file.h
index 49ccef84..766dd317 100644
--- a/src/common/include/gudhi/writing_persistence_to_file.h
+++ b/src/common/include/gudhi/writing_persistence_to_file.h
@@ -79,7 +79,7 @@ class Persistence_interval_common {
    * One intervals is smaller than the other if it has lower persistence.
    * Note that this operator do not take Arith_element into account when doing comparisions.
   **/
-  inline bool operator<(const Persistence_interval_common& i2) {
+  bool operator<(const Persistence_interval_common& i2) const {
     return fabs(this->death_ - this->birth_) < fabs(i2.death_ - i2.birth_);
   }
 
@@ -101,11 +101,6 @@ class Persistence_interval_common {
   Coefficient_field arith_element_;
 };
 
-template <typename Filtration_type, typename Coefficient_field>
-bool operator<(const Persistence_interval_common<Filtration_type, Coefficient_field>& i1,
-               const Persistence_interval_common<Filtration_type, Coefficient_field>& i2) {
-    return i1.operator<(i2);
-  }
 /**
  * This function write a vector<Persistence_interval_common> to a stream
 **/
@@ -116,6 +111,7 @@ void write_persistence_intervals_to_stream(const Persistence_interval_range& int
     out << interval << "\n";
   }
 }
+
 }
 
 #endif  // WRITING_PERSISTENCE_TO_FILE_H