From 48028d9fbcca84960514fb0622b9b22a48162cc0 Mon Sep 17 00:00:00 2001
From: Martin Quinson <martin.quinson@loria.fr>
Date: Thu, 10 May 2018 01:01:16 +0200
Subject: [PATCH] make s4u::Engine::pimpl private at the price of a static_cast
 deep below

There is something rotten between Netzone and NetzoneImpl. They should
be aligned with the design of the other s4u/kernel objects. At some
point.
---
 include/simgrid/s4u/Engine.hpp | 4 ++--
 src/s4u/s4u_Engine.cpp         | 6 ++++++
 src/surf/sg_platf.cpp          | 5 +----
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/include/simgrid/s4u/Engine.hpp b/include/simgrid/s4u/Engine.hpp
index 43c49204b8..381563fa91 100644
--- a/include/simgrid/s4u/Engine.hpp
+++ b/include/simgrid/s4u/Engine.hpp
@@ -110,6 +110,7 @@ public:
   simgrid::kernel::routing::NetPoint* netpoint_by_name_or_null(std::string name);
 
   simgrid::s4u::NetZone* get_netzone_root();
+  void set_netzone_root(s4u::NetZone* netzone);
 
   simgrid::s4u::NetZone* netzone_by_name_or_null(const char* name);
 
@@ -133,9 +134,8 @@ public:
    */
   void set_config(std::string str);
 
-  simgrid::kernel::EngineImpl* pimpl;
-
 private:
+  simgrid::kernel::EngineImpl* pimpl;
   static s4u::Engine* instance_;
 
   //////////////// Deprecated functions
diff --git a/src/s4u/s4u_Engine.cpp b/src/s4u/s4u_Engine.cpp
index 352e4eb79c..5860786bb5 100644
--- a/src/s4u/s4u_Engine.cpp
+++ b/src/s4u/s4u_Engine.cpp
@@ -193,6 +193,12 @@ s4u::NetZone* Engine::get_netzone_root()
 {
   return pimpl->netzone_root_;
 }
+/** @brief Set the root netzone, containing all others. Once set, it cannot be changed. */
+void Engine::set_netzone_root(s4u::NetZone* netzone)
+{
+  xbt_assert(pimpl->netzone_root_ == nullptr, "The root NetZone cannot be changed once set");
+  pimpl->netzone_root_ = static_cast<kernel::routing::NetZoneImpl*>(netzone);
+}
 
 static s4u::NetZone* netzone_by_name_recursive(s4u::NetZone* current, const char* name)
 {
diff --git a/src/surf/sg_platf.cpp b/src/surf/sg_platf.cpp
index c3c3562046..e7374e59c4 100644
--- a/src/surf/sg_platf.cpp
+++ b/src/surf/sg_platf.cpp
@@ -599,10 +599,7 @@ simgrid::s4u::NetZone* sg_platf_new_Zone_begin(simgrid::kernel::routing::ZoneCre
   }
 
   if (current_routing == nullptr) { /* it is the first one */
-    xbt_assert(simgrid::s4u::Engine::get_instance()->pimpl->netzone_root_ == nullptr,
-               "All defined components must belong to a networking zone.");
-    simgrid::s4u::Engine::get_instance()->pimpl->netzone_root_ = new_zone;
-
+    simgrid::s4u::Engine::get_instance()->set_netzone_root(new_zone);
   } else {
     /* set the father behavior */
     if (current_routing->hierarchy_ == simgrid::kernel::routing::NetZoneImpl::RoutingMode::unset)
-- 
2.20.1