http://code.google.com/p/rpcs3/source/detail?r=44

wxWidgets/include/wx/dynload.h

@@ -0,0 +1,153 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:         dynload.h
+// Purpose:      Dynamic loading framework
+// Author:       Ron Lee, David Falkinder, Vadim Zeitlin and a cast of 1000's
+//               (derived in part from dynlib.cpp (c) 1998 Guilhem Lavaux)
+// Modified by:
+// Created:      03/12/01
+// RCS-ID:       $Id: dynload.h 61872 2009-09-09 22:37:05Z VZ $
+// Copyright:    (c) 2001 Ron Lee <ron@debian.org>
+// Licence:      wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_DYNAMICLOADER_H__
+#define _WX_DYNAMICLOADER_H__
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+#include "wx/defs.h"
+
+#if wxUSE_DYNAMIC_LOADER
+
+#include "wx/dynlib.h"
+#include "wx/hashmap.h"
+#include "wx/module.h"
+
+class WXDLLIMPEXP_FWD_BASE wxPluginLibrary;
+
+
+WX_DECLARE_STRING_HASH_MAP_WITH_DECL(wxPluginLibrary *, wxDLManifest,
+                                     class WXDLLIMPEXP_BASE);
+typedef wxDLManifest wxDLImports;
+
+// ---------------------------------------------------------------------------
+// wxPluginLibrary
+// ---------------------------------------------------------------------------
+
+// NOTE: Do not attempt to use a base class pointer to this class.
+//       wxDL is not virtual and we deliberately hide some of it's
+//       methods here.
+//
+//       Unless you know exacty why you need to, you probably shouldn't
+//       instantiate this class directly anyway, use wxPluginManager
+//       instead.
+
+class WXDLLIMPEXP_BASE wxPluginLibrary : public wxDynamicLibrary
+{
+public:
+
+    static wxDLImports* ms_classes;  // Static hash of all imported classes.
+
+    wxPluginLibrary( const wxString &libname, int flags = wxDL_DEFAULT );
+    ~wxPluginLibrary();
+
+    wxPluginLibrary  *RefLib();
+    bool              UnrefLib();
+
+        // These two are called by the PluginSentinel on (PLUGGABLE) object
+        // creation/destruction.  There is usually no reason for the user to
+        // call them directly.  We have to separate this from the link count,
+        // since the two are not interchangeable.
+
+        // FIXME: for even better debugging PluginSentinel should register
+        //        the name of the class created too, then we can state
+        //        exactly which object was not destroyed which may be
+        //        difficult to find otherwise.  Also this code should
+        //        probably only be active in DEBUG mode, but let's just
+        //        get it right first.
+
+    void  RefObj() { ++m_objcount; }
+    void  UnrefObj()
+    {
+        wxASSERT_MSG( m_objcount > 0, wxT("Too many objects deleted??") );
+        --m_objcount;
+    }
+
+        // Override/hide some base class methods
+
+    bool  IsLoaded() const { return m_linkcount > 0; }
+    void  Unload() { UnrefLib(); }
+
+private:
+
+    wxClassInfo    *m_before;       // sm_first before loading this lib
+    wxClassInfo    *m_after;        // ..and after.
+
+    size_t          m_linkcount;    // Ref count of library link calls
+    size_t          m_objcount;     // ..and (pluggable) object instantiations.
+    wxModuleList    m_wxmodules;    // any wxModules that we initialised.
+
+    void    UpdateClasses();        // Update ms_classes
+    void    RestoreClasses();       // Removes this library from ms_classes
+    void    RegisterModules();      // Init any wxModules in the lib.
+    void    UnregisterModules();    // Cleanup any wxModules we installed.
+
+    DECLARE_NO_COPY_CLASS(wxPluginLibrary)
+};
+
+
+class WXDLLIMPEXP_BASE wxPluginManager
+{
+public:
+
+        // Static accessors.
+
+    static wxPluginLibrary    *LoadLibrary( const wxString &libname,
+                                            int flags = wxDL_DEFAULT );
+    static bool                UnloadLibrary(const wxString &libname);
+
+        // Instance methods.
+
+    wxPluginManager() : m_entry(NULL) {}
+    wxPluginManager(const wxString &libname, int flags = wxDL_DEFAULT)
+    {
+        Load(libname, flags);
+    }
+    ~wxPluginManager() { if ( IsLoaded() ) Unload(); }
+
+    bool   Load(const wxString &libname, int flags = wxDL_DEFAULT);
+    void   Unload();
+
+    bool   IsLoaded() const { return m_entry && m_entry->IsLoaded(); }
+    void  *GetSymbol(const wxString &symbol, bool *success = 0)
+    {
+        return m_entry->GetSymbol( symbol, success );
+    }
+
+    static void CreateManifest() { ms_manifest = new wxDLManifest(wxKEY_STRING); }
+    static void ClearManifest() { delete ms_manifest; ms_manifest = NULL; }
+
+private:
+    // return the pointer to the entry for the library with given name in
+    // ms_manifest or NULL if none
+    static wxPluginLibrary *FindByName(const wxString& name)
+    {
+        const wxDLManifest::iterator i = ms_manifest->find(name);
+
+        return i == ms_manifest->end() ? NULL : i->second;
+    }
+
+    static wxDLManifest* ms_manifest;  // Static hash of loaded libs.
+    wxPluginLibrary*     m_entry;      // Cache our entry in the manifest.
+
+    // We could allow this class to be copied if we really
+    // wanted to, but not without modification.
+    DECLARE_NO_COPY_CLASS(wxPluginManager)
+};
+
+
+#endif  // wxUSE_DYNAMIC_LOADER
+#endif  // _WX_DYNAMICLOADER_H__
+