savepoint, changelog later..

include/crlib/cr-library.h

@@ -0,0 +1,89 @@
+//
+// Yet Another POD-Bot, based on PODBot by Markus Klinge ("CountFloyd").
+// Copyright (c) YaPB Development Team.
+//
+// This software is licensed under the BSD-style license.
+// Additional exceptions apply. For full license details, see LICENSE.txt or visit:
+//     https://yapb.ru/license
+//
+
+#pragma once
+
+#include <crlib/cr-basic.h>
+#include <crlib/cr-string.h>
+
+#if defined (CR_LINUX) || defined (CR_OSX)
+#  include <dlfcn.h>
+#  include <errno.h>
+#  include <fcntl.h>
+#  include <sys/stat.h>
+#  include <unistd.h>
+#elif defined (CR_WINDOWS)
+#  define WIN32_LEAN_AND_MEAN 
+#  include <windows.h>
+#endif
+
+
+CR_NAMESPACE_BEGIN
+
+// handling dynamic library loading
+class SharedLibrary final : public DenyCopying {
+private:
+   void *m_handle = nullptr;
+
+public:
+   explicit SharedLibrary () = default;
+
+   SharedLibrary (const String &file) {
+      if (file.empty ()) {
+         return;
+      }
+      load (file);
+   }
+
+   ~SharedLibrary () {
+      unload ();
+   }
+
+public:
+   inline bool load (const String &file) noexcept {
+#ifdef CR_WINDOWS
+      m_handle = LoadLibraryA (file.chars ());
+#else
+      m_handle = dlopen (file.chars (), RTLD_NOW);
+#endif
+      return m_handle != nullptr;
+   }
+
+   void unload () noexcept {
+      if (!*this) {
+         return;
+      }
+#ifdef CR_WINDOWS
+      FreeLibrary (static_cast <HMODULE> (m_handle));
+#else
+      dlclose (m_handle);
+#endif
+   }
+
+   template <typename R> R resolve (const char *function) const {
+      if (!*this) {
+         return nullptr;
+      }
+
+      return reinterpret_cast <R> (
+#ifdef CR_WINDOWS
+         GetProcAddress (static_cast <HMODULE> (m_handle), function)
+#else
+         dlsym (m_handle, function)
+#endif
+         );
+   }
+
+public:
+   explicit operator bool () const {
+      return m_handle != nullptr;
+   }
+};
+
+CR_NAMESPACE_END