From ab0964384e808a72a6e3c55d12ae8c9665ea6fb7 Mon Sep 17 00:00:00 2001
From: curt <curt>
Date: Thu, 11 Apr 2002 16:25:12 +0000
Subject: [PATCH] Bernie Bright:

Here are the Boost-less FGEventMgr updates I promised.

Removed Boost dependencies from FGEventMgr.
Removed Boost configure check.
fgMethodCallback now handles const member functions.

I've successfully tested these changes with gcc and msvc.
---
 src/Cockpit/radiostack.cxx  |  4 +--
 src/Include/fg_callback.hxx | 19 ++++++++--
 src/Main/fg_init.cxx        | 10 ++----
 src/Time/FGEventMgr.cxx     | 62 ++++++++++++++++++--------------
 src/Time/FGEventMgr.hxx     | 72 +++++++++++++++++++++++--------------
 5 files changed, 100 insertions(+), 67 deletions(-)

diff --git a/src/Cockpit/radiostack.cxx b/src/Cockpit/radiostack.cxx
index 62bbd53fa..c0b373600 100644
--- a/src/Cockpit/radiostack.cxx
+++ b/src/Cockpit/radiostack.cxx
@@ -35,7 +35,6 @@
 #include <Navaids/mkrbeacons.hxx>
 #include <Navaids/navlist.hxx>
 #include <Time/FGEventMgr.hxx>
-#include <boost/bind.hpp>
 
 #include "radiostack.hxx"
 
@@ -143,8 +142,7 @@ FGRadioStack::init ()
 
     // Search radio database once per second
     global_events.Register( "fgRadioSearch()",
-			    boost::bind( &FGRadioStack::search,
-                                         current_radiostack),
+			    current_radiostack, &FGRadioStack::search,
 			    1000 );
 }
 
diff --git a/src/Include/fg_callback.hxx b/src/Include/fg_callback.hxx
index 5b0f112a9..dcad810ba 100644
--- a/src/Include/fg_callback.hxx
+++ b/src/Include/fg_callback.hxx
@@ -22,6 +22,8 @@
 #ifndef _FG_CALLBACK_HXX
 #define _FG_CALLBACK_HXX
 
+#include <stdlib.h>
+
 // -dw- need size_t for params() function
 #ifdef __MWERKS__
 typedef unsigned long	size_t;
@@ -114,14 +116,16 @@ fgFunctionCallback::call0v( void** )
 
 //-----------------------------------------------------------------------------
 //
-// Callback for invoking an object method.
+// Callback for invoking a member function.
 //
+//template< typename Ret, class T >
 template< class T >
 class fgMethodCallback : public fgCallback
 {
 public:
     // Pointer to method taking no arguments and returning void.
     typedef void (T::*Method0v)();
+    typedef void (T::*Method0vc)() const;
 
     // A callback instance to invoke method 'm' of object 'o' 
     fgMethodCallback( T* o, Method0v m )
@@ -130,6 +134,13 @@ public:
 	  method0v(m),
 	  doPtr(&fgMethodCallback<T>::call0v) {}
 
+    // A callback instance to invoke a const method 'm' of object 'o' 
+    fgMethodCallback( T* o, Method0vc m )
+	: fgCallback(0),
+	  object(o),
+	  method0vc(m),
+	  doPtr(&fgMethodCallback<T>::call0v) {}
+
     // Create a clone on the heap.
     fgCallback* clone() const;
 
@@ -146,7 +157,10 @@ private:
 
 private:
     T* object;
-    Method0v method0v;
+    union {
+	Method0v  method0v;
+	Method0vc method0vc;
+    };
 
     // typedef void * (fgMethodCallback::*DoPtr)( void ** );
     typedef void * (fgMethodCallback<T>::*DoPtr)( void ** );
@@ -175,4 +189,3 @@ fgMethodCallback<T>::call0v( void** )
 
 #endif // _FG_CALLBACK_HXX
 
-
diff --git a/src/Main/fg_init.cxx b/src/Main/fg_init.cxx
index 4be563e8a..319de0dde 100644
--- a/src/Main/fg_init.cxx
+++ b/src/Main/fg_init.cxx
@@ -105,7 +105,6 @@
 #include <Sound/fg_fx.hxx>
 #include <Sound/soundmgr.hxx>
 #include <Time/FGEventMgr.hxx>
-#include <boost/bind.hpp>
 #include <Time/light.hxx>
 #include <Time/sunpos.hxx>
 #include <Time/moonpos.hxx>
@@ -777,9 +776,8 @@ bool fgInitSubsystems( void ) {
     global_events.init();
 
     // Output event stats every 60 seconds
-    global_events.Register( "fgEVENT_MGR::PrintStats()",
-			    boost::bind( &FGEventMgr::print_stats,
-                                         &global_events ),
+    global_events.Register( "FGEventMgr::print_stats()",
+			    &global_events, &FGEventMgr::print_stats,
 			    60000 );
 
 
@@ -809,7 +807,7 @@ bool fgInitSubsystems( void ) {
 
     // update the lighting parameters (based on sun angle)
     global_events.Register( "fgLight::Update()",
-			    boost::bind( &fgLIGHT::Update, &cur_light_params ),
+			    &cur_light_params, &fgLIGHT::Update,
 			    30000 );
 
 
@@ -1128,5 +1126,3 @@ void fgReInitSubsystems( void )
 	fgSetBool("/sim/freeze/master", false);
     }
 }
-
-
diff --git a/src/Time/FGEventMgr.cxx b/src/Time/FGEventMgr.cxx
index f6fdcfea7..c8aedd488 100644
--- a/src/Time/FGEventMgr.cxx
+++ b/src/Time/FGEventMgr.cxx
@@ -4,15 +4,17 @@
 
 #include <simgear/compiler.h>
 #include <simgear/debug/logstream.hxx>
-#include <functional>
-#include <boost/bind.hpp>
+// #include <functional>
+// #include <algorithm>
 
 #include "FGEventMgr.hxx"
 
 FGEventMgr::FGEvent::FGEvent()
-    : status(FG_EVENT_SUSP),
-      interval_ms(0),
-      ms_to_go(0),
+    : name_(""),
+      callback_(0),
+      status_(FG_EVENT_SUSP),
+      ms_(0),
+      ms_to_go_(0),
       cum_time(0),
       min_time(100000),
       max_time(0),
@@ -20,15 +22,15 @@ FGEventMgr::FGEvent::FGEvent()
 {
 }
 
-FGEventMgr::FGEvent::FGEvent( const string& desc,
-			      callback_type cb,
-			      EventState status_,
+FGEventMgr::FGEvent::FGEvent( const char* name,
+			      fgCallback* cb,
+			      EventState status,
 			      interval_type ms )
-    : description(desc),
-      callback(cb),
-      status(status_),
-      interval_ms(ms),
-      ms_to_go(ms),
+    : name_(name),
+      callback_(cb),
+      status_(status),
+      ms_(ms),
+      ms_to_go_(ms),
       cum_time(0),
       min_time(100000),
       max_time(0),
@@ -39,6 +41,7 @@ FGEventMgr::FGEvent::FGEvent( const string& desc,
 
 FGEventMgr::FGEvent::~FGEvent()
 {
+    //delete callback_;
 }
 
 void
@@ -50,7 +53,7 @@ FGEventMgr::FGEvent::run()
     start_time.stamp();
 
     // run the event
-    this->callback();
+    callback_->call(0);
 
     finish_time.stamp();
 
@@ -75,8 +78,8 @@ void
 FGEventMgr::FGEvent::print_stats() const
 {
     SG_LOG( SG_EVENT, SG_INFO, 
-            "  " << description 
-            << " int=" << interval_ms / 1000.0
+            "  " << name_
+            << " int=" << ms_ / 1000.0
             << " cum=" << cum_time
             << " min=" << min_time
             << " max=" <<  max_time
@@ -126,18 +129,14 @@ FGEventMgr::update( int dt )
 }
 
 void
-FGEventMgr::Register( const string& desc,
-		      callback_type cb,
-		      EventState state,
-		      interval_type ms )
+FGEventMgr::Register( const FGEvent& event )
 {
-    FGEvent event( desc, cb, state, ms );
-    if (state == FG_EVENT_READY)
-	event.run();
+//     if (event.is_ready())
+// 	event.run();
     event_table.push_back( event );
 
-    SG_LOG( SG_EVENT, SG_INFO, "Registered event " << desc
-	    << " to run every " << ms << "ms" );
+    SG_LOG( SG_EVENT, SG_INFO, "Registered event " << event.name()
+	    << " to run every " << event.interval() << "ms" );
 }
 
 void
@@ -147,8 +146,17 @@ FGEventMgr::print_stats() const
     SG_LOG( SG_EVENT, SG_INFO, "Event Stats" );
     SG_LOG( SG_EVENT, SG_INFO, "-----------" );
 
+#if 1
+    event_container_type::const_iterator first = event_table.begin();
+    event_container_type::const_iterator last = event_table.end();
+    for (; first != last; ++first)
+    {
+	first->print_stats();
+    }
+#else
+    // #@!$ MSVC can't handle const member functions.
     std::for_each( event_table.begin(), event_table.end(),
-		   boost::bind( &FGEvent::print_stats, _1 ) );
-
+        std::mem_fun_ref( &FGEvent::print_stats ) );
+#endif
     SG_LOG( SG_EVENT, SG_INFO, "" );
 }
diff --git a/src/Time/FGEventMgr.hxx b/src/Time/FGEventMgr.hxx
index daeaaa7bb..085135f69 100644
--- a/src/Time/FGEventMgr.hxx
+++ b/src/Time/FGEventMgr.hxx
@@ -24,12 +24,12 @@
 #ifndef FG_EVENT_MGR_H_INCLUDED
 #define FG_EVENT_MGR_H_INCLUDED 1
 
-#include <boost/function.hpp>
-
 #include <simgear/compiler.h>
 #include <simgear/timing/timestamp.hxx>
 
 #include <Main/fgfs.hxx>
+#include <Include/fg_callback.hxx>
+
 #include <vector>
 #include <string>
 
@@ -52,7 +52,6 @@ public:
 	FG_EVENT_QUEUED = 2
     };
 
-    typedef boost::function<void> callback_type;
     typedef int interval_type;
 
 private:
@@ -68,9 +67,9 @@ private:
 	 */
 	FGEvent();
 
-	FGEvent( const string& desc,
-		 callback_type cb,
-		 EventState status_,
+	FGEvent( const char* desc,
+		 fgCallback* cb,
+		 EventState status,
 		 interval_type ms );
 
 	/**
@@ -83,8 +82,8 @@ private:
 	 */
 	void reset()
 	{
-	    status = FG_EVENT_READY;
-	    ms_to_go = interval_ms;
+	    status_ = FG_EVENT_READY;
+	    ms_to_go_ = ms_;
 	}
 
 	/**
@@ -92,6 +91,11 @@ private:
 	 */
 	void run();
 
+	bool is_ready() const { return status_ == FG_EVENT_READY; }
+
+	string name() const { return name_; }
+	interval_type interval() const { return ms_; }
+
 	/**
 	 * Display event statistics.
 	 */
@@ -104,19 +108,19 @@ private:
 	 */
 	bool update( int dt_ms )
 	{
-	    if (status != FG_EVENT_READY)
+	    if (status_ != FG_EVENT_READY)
 		return false;
 
-	    ms_to_go -= dt_ms;
-	    return ms_to_go <= 0;
+	    ms_to_go_ -= dt_ms;
+	    return ms_to_go_ <= 0;
 	}
 
     private:
-	string description;
-	callback_type callback;
-	EventState status;
-	interval_type interval_ms;
-	int ms_to_go;
+	string name_;
+	fgCallback* callback_;
+	EventState status_;
+	interval_type ms_;
+	int ms_to_go_;
 
 	unsigned long cum_time;    // cumulative processor time of this event
 	unsigned long min_time;    // time of quickest execution
@@ -150,19 +154,30 @@ public:
      * @param state
      * @param interval Callback repetition rate in milliseconds.
      */
-    void Register( const string& desc,
-		   callback_type cb,
-		   EventState state,
-		   interval_type interval_ms );
+    void Register( const char* name,
+		   void (*cb)(),
+		   interval_type interval_ms,
+		   EventState state = FG_EVENT_READY )
+    {
+	this->Register( FGEvent( name, new fgFunctionCallback(cb), state, interval_ms ) );
+    }
 
-    /**
-     * 
-     */
-    void Register( const string& desc,
-		   callback_type cb,
-		   interval_type interval_ms )
+    template< class Obj >
+    void Register( const char* name,
+		   Obj* obj, void (Obj::*pmf)() const,
+		   interval_type interval_ms,
+		   EventState state = FG_EVENT_READY )
     {
-	this->Register( desc, cb, FG_EVENT_READY, interval_ms );
+	this->Register( FGEvent( name, new fgMethodCallback<Obj>(obj,pmf), state, interval_ms ) );
+    }
+
+    template< class Obj >
+    void Register( const char* name,
+		   Obj* obj, void (Obj::*pmf)(),
+		   interval_type interval_ms,
+		   EventState state = FG_EVENT_READY )
+    {
+	this->Register( FGEvent( name, new fgMethodCallback<Obj>(obj,pmf), state, interval_ms ) );
     }
 
     /**
@@ -170,6 +185,9 @@ public:
      */
     void print_stats() const;
 
+private:
+    void Register( const FGEvent& event );
+
 private:
 
     typedef vector< FGEvent > event_container_type;
-- 
2.39.5