Repo created

TMessagesProj/jni/voip/webrtc/base/scoped_native_library.h

@@ -0,0 +1,64 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_SCOPED_NATIVE_LIBRARY_H_
+#define BASE_SCOPED_NATIVE_LIBRARY_H_
+
+#include "base/base_export.h"
+#include "base/macros.h"
+#include "base/native_library.h"
+#include "base/scoped_generic.h"
+
+namespace base {
+
+class FilePath;
+
+struct BASE_EXPORT NativeLibraryTraits {
+  // It's assumed that this is a fast inline function with little-to-no
+  // penalty for duplicate calls. This must be a static function even
+  // for stateful traits.
+  static NativeLibrary InvalidValue() { return nullptr; }
+
+  // This free function will not be called if library == InvalidValue()!
+  static void Free(NativeLibrary library);
+};
+
+// A class which encapsulates a base::NativeLibrary object available only in a
+// scope.
+// This class automatically unloads the loaded library in its destructor.
+class BASE_EXPORT ScopedNativeLibrary
+    : public ScopedGeneric<NativeLibrary, NativeLibraryTraits> {
+ public:
+  // Initializes with a NULL library.
+  ScopedNativeLibrary();
+
+  ~ScopedNativeLibrary() override;
+
+  // Takes ownership of the given library handle.
+  explicit ScopedNativeLibrary(NativeLibrary library);
+
+  // Opens the given library and manages its lifetime.
+  explicit ScopedNativeLibrary(const FilePath& library_path);
+
+  // Move constructor. Takes ownership of handle stored in |scoped_library|
+  ScopedNativeLibrary(ScopedNativeLibrary&& scoped_library);
+
+  // Move assignment operator. Takes ownership of handle stored in
+  // |scoped_library|.
+  ScopedNativeLibrary& operator=(ScopedNativeLibrary&& scoped_library) =
+      default;
+
+  void* GetFunctionPointer(const char* function_name) const;
+
+  const NativeLibraryLoadError* GetError() const;
+
+ private:
+  NativeLibraryLoadError error_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedNativeLibrary);
+};
+
+}  // namespace base
+
+#endif  // BASE_SCOPED_NATIVE_LIBRARY_H_