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// Copyright 2011 The Chromium Authors
// 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/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();
// 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;
ScopedNativeLibrary(const ScopedNativeLibrary&) = delete;
ScopedNativeLibrary& operator=(const ScopedNativeLibrary&) = delete;
~ScopedNativeLibrary() override;
void* GetFunctionPointer(const char* function_name) const;
const NativeLibraryLoadError* GetError() const;
private:
NativeLibraryLoadError error_;
};
} // namespace base
#endif // BASE_SCOPED_NATIVE_LIBRARY_H_
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