Further fixups and cosmetics in the doc

[simgrid.git] / include / simgrid / s4u / Io.hpp

diff --git a/include/simgrid/s4u/Io.hpp b/include/simgrid/s4u/Io.hpp
index c3bb33c..c3118c3 100644 (file)
--- a/include/simgrid/s4u/Io.hpp
+++ b/include/simgrid/s4u/Io.hpp
@@ -25,13 +25,15 @@ class XBT_PUBLIC Io : public Activity_T<Io> {
   friend kernel::EngineImpl;
 #endif
 
+  static xbt::signal<void(Io const&)> on_start;
+
 protected:
   explicit Io(kernel::activity::IoImplPtr pimpl);
 
 public:
   enum class OpType { READ, WRITE };
 
-  static xbt::signal<void(Io const&)> on_start;
+  static void on_start_cb(const std::function<void(Io const&)>& cb) { on_start.connect(cb); }
 
   static IoPtr init();
   Io* start() override;