1 files changed, 33 insertions, 0 deletions
diff --git a/utils/sparse_vector.h b/utils/sparse_vector.h
index 5d0dac27..c5e18b96 100644
--- a/utils/sparse_vector.h
+++ b/utils/sparse_vector.h
@@ -56,6 +56,10 @@ TODO: specialize for int value types, where it probably makes sense to check if
 #include "small_vector.h"
 #include "string_to.h"
 
+#if HAVE_BOOST_ARCHIVE_TEXT_OARCHIVE_HPP
+#include <boost/serialization/map.hpp>
+#endif
+
 template <class T>
 inline T & extend_vector(std::vector<T> &v,int i) {
   if (i>=v.size())
@@ -510,6 +514,35 @@ public:
 
 private:
   MapType values_;
+
+#if HAVE_BOOST_ARCHIVE_TEXT_OARCHIVE_HPP
+  friend class boost::serialization::access;
+  template<class Archive>
+  void save(Archive & ar, const unsigned int version) const {
+    (void) version;
+    int eff_size = values_.size();
+    const_iterator it = this->begin();
+    if (values_.find(0) != values_.end()) { ++it; --eff_size; }
+    ar & eff_size;
+    while (it != this->end()) {
+      const std::pair<std::string, T> wire_pair(FD::Convert(it->first), it->second);
+      ar & wire_pair;
+      ++it;
+    }
+  }
+  template<class Archive>
+  void load(Archive & ar, const unsigned int version) {
+    (void) version;
+    this->clear();
+    int sz; ar & sz;
+    for (int i = 0; i < sz; ++i) {
+      std::pair<std::string, T> wire_pair;
+      ar & wire_pair;
+      this->set_value(FD::Convert(wire_pair.first), wire_pair.second);
+    }
+  }
+  BOOST_SERIALIZATION_SPLIT_MEMBER()
+#endif
 };
 
 template <class T>