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// Copyright 2017 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 UI_BASE_GLIB_SCOPED_GOBJECT_H_
#define UI_BASE_GLIB_SCOPED_GOBJECT_H_
// Similar in spirit to a std::unique_ptr.
template <typename T>
class ScopedGObject {
public:
ScopedGObject() : obj_(nullptr) {}
explicit ScopedGObject(T* obj) : obj_(obj) { Ref(); }
ScopedGObject(const ScopedGObject<T>& other) = delete;
ScopedGObject(ScopedGObject<T>&& other) : obj_(other.obj_) {
other.obj_ = nullptr;
}
~ScopedGObject() { reset(); }
ScopedGObject<T>& operator=(const ScopedGObject<T>& other) = delete;
ScopedGObject<T>& operator=(ScopedGObject<T>&& other) {
reset();
obj_ = other.obj_;
other.obj_ = nullptr;
return *this;
}
T* get() { return obj_; }
operator T*() { return obj_; }
void reset(T* obj = nullptr) {
Unref();
obj_ = obj;
Ref();
}
private:
void Ref() {
// Remove the floating reference from |obj_| if it has one.
if (obj_ && g_object_is_floating(obj_))
g_object_ref_sink(obj_);
}
// This function is necessary so that gtk can overload it in
// the case of T = GtkStyleContext.
void Unref() {
if (obj_)
g_object_unref(obj_);
}
T* obj_;
};
#endif // UI_BASE_GLIB_SCOPED_GOBJECT_H_
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