#ifndef RIPPLE_SHAMAPADDNODE_H
#define RIPPLE_SHAMAPADDNODE_H

// results of adding nodes
class SHAMapAddNode
{
public:
	SHAMapAddNode()
        : mInvalid (false)
        , mUseful (false)
    {
    }

	void setInvalid()		{ mInvalid = true; }
	void setUseful() 		{ mUseful = true; }
	void reset()			{ mInvalid = false; mUseful = false; }

	bool isInvalid() const	{ return mInvalid; }
	bool isUseful() const	{ return mUseful; }

	bool combine (SHAMapAddNode const& n)
	{
        // VFALCO NOTE What is the meaning of these lines?

		if (n.mInvalid)
		{
			mInvalid = true;
			return false;
		}

		if (n.mUseful)
			mUseful = true;

		return true;
	}

	operator bool() const		{ return !mInvalid; }

	static SHAMapAddNode okay()		{ return SHAMapAddNode(false, false); }
	static SHAMapAddNode useful()	{ return SHAMapAddNode(false, true); }
	static SHAMapAddNode invalid()	{ return SHAMapAddNode(true, false); }

private:
	SHAMapAddNode (bool i, bool u)
        : mInvalid (i)
        , mUseful (u)
    {
    }

    bool mInvalid;
    bool mUseful;
};

#endif