DynamicLoader.h

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/*============================================================================
  KWSys - Kitware System Library
  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium

  Distributed under the OSI-approved BSD License (the "License");
  see accompanying file Copyright.txt for details.

  This software is distributed WITHOUT ANY WARRANTY; without even the
  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the License for more information.
  ============================================================================*/
#ifndef DATATOOLS_DYNAMICLOADER_HXX
#define DATATOOLS_DYNAMICLOADER_HXX

#include <datatools/detail/Configure.h>

#if defined(__hpux)
#include <dl.h>
#elif defined(_WIN32) && !defined(__CYGWIN__)
#include <windows.h>
#elif defined(__APPLE__)
#include <AvailabilityMacros.h>
#if MAC_OS_X_VERSION_MAX_ALLOWED < 1030
#include <mach-o/dyld.h>
#endif
#elif defined(__BEOS__)
#include <be/kernel/image.h>
#endif

namespace datatools
{
  namespace detail
  {
    class datatools_EXPORT DynamicLoader
    {
    public:
      // Ugly stuff for library handles
      // They are different on several different OS's
#if defined(__hpux)
      typedef shl_t LibraryHandle;
#elif defined(_WIN32) && !defined(__CYGWIN__)
      typedef HMODULE LibraryHandle;
#elif defined(__APPLE__)
#if MAC_OS_X_VERSION_MAX_ALLOWED < 1030
      typedef NSModule LibraryHandle;
#else
      typedef void* LibraryHandle;
#endif
#elif defined(__BEOS__)
      typedef image_id LibraryHandle;
#else  // POSIX
      typedef void* LibraryHandle;
#endif

      // Return type from DynamicLoader::GetSymbolAddress.
      typedef void (*SymbolPointer)();

      static LibraryHandle OpenLibrary(const char*);

      static int CloseLibrary(LibraryHandle);

      static SymbolPointer GetSymbolAddress(LibraryHandle, const char*);

      static const char* LibPrefix() { return "lib"; }

      static const char* LibExtension() {
#if defined(__APPLE__)
  // NB could also be ".bundle"
  return ".dylib";
#else // default POSIX
  return ".so";
#endif
      }

      static const char* LastError();
    }; // End Class: DynamicLoader

  } // namespace detail

} // namespace datatools

#endif // DATATOOLS_DYNAMICLOADER_HXX

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