From f9fa3467af7d1cb3e1797170d62c0cc6f87f8cf4 Mon Sep 17 00:00:00 2001
From: vrouvrea <vrouvrea@636b058d-ea47-450e-bf9e-a15bfbe3eedb>
Date: Tue, 3 Apr 2018 14:45:54 +0000
Subject: Add explicit operator< to fix sort bug

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/trunk@3331 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: d1a70cdbae311f1376e24d61568471d81b7f0df1
---
 src/common/include/gudhi/writing_persistence_to_file.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/common/include/gudhi/writing_persistence_to_file.h b/src/common/include/gudhi/writing_persistence_to_file.h
index 5020b5fb..49ccef84 100644
--- a/src/common/include/gudhi/writing_persistence_to_file.h
+++ b/src/common/include/gudhi/writing_persistence_to_file.h
@@ -101,6 +101,11 @@ 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
 **/
-- 
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