Serialization: add macro to define API version

include/multicontact-api/scenario/contact-model.hpp

@@ -140,4 +140,6 @@ struct ContactModelTpl : public serialization::Serializable<ContactModelTpl<_Sca
 }  // namespace scenario
 }  // namespace multicontact_api
 
+DEFINE_CLASS_TEMPLATE_VERSION(typename Scalar, multicontact_api::scenario::ContactModelTpl<Scalar>)
+
 #endif  // ifndef __multicontact_api_scenario_contact_model_planar_hpp__

include/multicontact-api/scenario/contact-patch.hpp

@@ -88,4 +88,6 @@ struct ContactPatchTpl : public serialization::Serializable<ContactPatchTpl<_Sca
 }  // namespace scenario
 }  // namespace multicontact_api
 
+DEFINE_CLASS_TEMPLATE_VERSION(typename Scalar, multicontact_api::scenario::ContactPatchTpl<Scalar>)
+
 #endif  // __multicontact_api_scenario_contact_patch_hpp__

include/multicontact-api/scenario/contact-phase.hpp

@@ -699,4 +699,6 @@ struct ContactPhaseTpl : public serialization::Serializable<ContactPhaseTpl<_Sca
 }  // namespace scenario
 }  // namespace multicontact_api
 
+DEFINE_CLASS_TEMPLATE_VERSION(typename Scalar, multicontact_api::scenario::ContactPhaseTpl<Scalar>)
+
 #endif  // CONTACTPHASE_HPP

include/multicontact-api/scenario/contact-sequence.hpp

@@ -1248,4 +1248,7 @@ struct ContactSequenceTpl : public serialization::Serializable<ContactSequenceTp
 
 }  // namespace scenario
 }  // namespace multicontact_api
+
+DEFINE_CLASS_TEMPLATE_VERSION(typename Scalar, multicontact_api::scenario::ContactSequenceTpl<Scalar>)
+
 #endif  // __multicontact_api_scenario_contact_sequence_hpp__

include/multicontact-api/serialization/archive.hpp

@@ -13,6 +13,22 @@
 #include <boost/archive/xml_oarchive.hpp>
 #include <boost/archive/binary_iarchive.hpp>
 #include <boost/archive/binary_oarchive.hpp>
+#include <boost/serialization/version.hpp>
+
+const unsigned int API_VERSION = 1;  // must be increased everytime the save() method of a class is modified
+
+// Macro used to define the serialization version of a templated class
+#define DEFINE_CLASS_TEMPLATE_VERSION(Template, Type)  \
+  namespace boost {                                    \
+  namespace serialization {                            \
+  template <Template>                                  \
+  struct version<Type> {                               \
+    static constexpr unsigned int value = API_VERSION; \
+  };                                                   \
+  template <Template>                                  \
+  constexpr unsigned int version<Type>::value;         \
+  }                                                    \
+  }
 
 namespace multicontact_api {
 namespace serialization {