Source/WebCore/bindings/js/WebCoreOpaqueRoot.h

/*
 * Copyright (C) 2022 Apple Inc. All Rights Reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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#pragma once

#include "Node.h"

namespace WebCore {

class WebCoreOpaqueRoot {
public:
    template<typename T, typename = typename std::enable_if_t<!std::is_same_v<T, void>>>
    explicit WebCoreOpaqueRoot(T* pointer)
        : m_pointer(static_cast<void*>(pointer))
        , m_isNode(pointer && std::is_base_of_v<Node, T>)
    {
    }

    WebCoreOpaqueRoot(std::nullptr_t) { }

    bool isNode() const { return m_isNode; }
    void* pointer() const { return m_pointer; }

private:
    void* m_pointer { nullptr };
    bool m_isNode { false };
};

template<typename Visitor>
ALWAYS_INLINE void addWebCoreOpaqueRoot(Visitor& visitor, WebCoreOpaqueRoot root)
{
    visitor.addOpaqueRoot(root.pointer());
}

template<typename Visitor, typename ImplType>
ALWAYS_INLINE void addWebCoreOpaqueRoot(Visitor& visitor, ImplType* impl)
{
    addWebCoreOpaqueRoot(visitor, root(impl));
}

template<typename Visitor, typename ImplType>
ALWAYS_INLINE void addWebCoreOpaqueRoot(Visitor& visitor, ImplType& impl)
{
    addWebCoreOpaqueRoot(visitor, root(&impl));
}

template<typename Visitor>
ALWAYS_INLINE bool containsWebCoreOpaqueRoot(Visitor& visitor, WebCoreOpaqueRoot root)
{
    return visitor.containsOpaqueRoot(root.pointer());
}

template<typename Visitor, typename ImplType>
ALWAYS_INLINE bool containsWebCoreOpaqueRoot(Visitor& visitor, ImplType& impl)
{
    return containsWebCoreOpaqueRoot(visitor, root(&impl));
}

template<typename Visitor, typename ImplType>
ALWAYS_INLINE bool containsWebCoreOpaqueRoot(Visitor& visitor, ImplType* impl)
{
    return containsWebCoreOpaqueRoot(visitor, root(impl));
}

} // namespace WebCore