From fff19a2cf3d8dc72fc596b693500dec0e04f4fbe Mon Sep 17 00:00:00 2001
From: Joakim Hove <joakim.hove@gmail.com>
Date: Sun, 3 Jan 2021 10:30:51 +0100
Subject: [PATCH] Serialize std::chrono::system_clock::time_point through
 std::time_t

---
 opm/simulators/utils/ParallelRestart.cpp | 24 ++++++++++++++++++++++++
 opm/simulators/utils/ParallelRestart.hpp |  2 ++
 2 files changed, 26 insertions(+)

diff --git a/opm/simulators/utils/ParallelRestart.cpp b/opm/simulators/utils/ParallelRestart.cpp
index b2065c9d1..347645eb0 100644
--- a/opm/simulators/utils/ParallelRestart.cpp
+++ b/opm/simulators/utils/ParallelRestart.cpp
@@ -22,6 +22,7 @@
 #endif
 
 #include "ParallelRestart.hpp"
+#include <ctime>
 #include <dune/common/parallel/mpitraits.hh>
 
 #define HANDLE_AS_POD(T) \
@@ -282,6 +283,13 @@ std::size_t packSize(const RestartValue& data, Dune::MPIHelper::MPICommunicator
         +  packSize(data.extra, comm);
 }
 
+std::size_t packSize(const std::chrono::system_clock::time_point&, Dune::MPIHelper::MPICommunicator comm)
+{
+    std::time_t tp;
+    return packSize(tp, comm);
+}
+
+
 ////// pack routines
 
 template<class T>
@@ -568,6 +576,13 @@ void pack(const RestartValue& data, std::vector<char>& buffer, int& position,
     pack(data.extra, buffer, position, comm);
 }
 
+void pack(const std::chrono::system_clock::time_point& data, std::vector<char>& buffer, int& position,
+          Dune::MPIHelper::MPICommunicator comm)
+{
+    pack(std::chrono::system_clock::to_time_t(data), buffer, position, comm);
+}
+
+
 /// unpack routines
 
 template<class T>
@@ -872,6 +887,15 @@ void unpack(RestartValue& data, std::vector<char>& buffer, int& position,
     unpack(data.extra, buffer, position, comm);
 }
 
+void unpack(std::chrono::system_clock::time_point& data, std::vector<char>& buffer, int& position,
+            Dune::MPIHelper::MPICommunicator comm)
+{
+    std::time_t tp;
+    unpack(tp, buffer, position, comm);
+    data = std::chrono::system_clock::from_time_t(tp);
+}
+
+
 #define INSTANTIATE_PACK_VECTOR(...) \
 template std::size_t packSize(const std::vector<__VA_ARGS__>& data, \
                               Dune::MPIHelper::MPICommunicator comm); \
diff --git a/opm/simulators/utils/ParallelRestart.hpp b/opm/simulators/utils/ParallelRestart.hpp
index f8b018b31..aad0ce9be 100644
--- a/opm/simulators/utils/ParallelRestart.hpp
+++ b/opm/simulators/utils/ParallelRestart.hpp
@@ -30,6 +30,7 @@
 
 #include <dune/common/parallel/mpihelper.hh>
 
+#include <chrono>
 #include <optional>
 #include <map>
 #include <set>
@@ -317,6 +318,7 @@ ADD_PACK_PROTOTYPES(data::WellRates)
 ADD_PACK_PROTOTYPES(RestartKey)
 ADD_PACK_PROTOTYPES(RestartValue)
 ADD_PACK_PROTOTYPES(std::string)
+ADD_PACK_PROTOTYPES(std::chrono::system_clock::time_point)
 
 } // end namespace Mpi