fig04_28.cpp

经典书籍源代码啊。。。第三版。。。数据结构与算法分析——C++描述(第3版).

    /**
     * Deep copy.
     */
    const BinarySearchTree & operator=( const BinarySearchTree & rhs )
    {
        if( this != &rhs )
        {
            makeEmpty( );
            root = clone( rhs.root );
        }
        return *this;
    }
    
    /**
     * Internal method to clone subtree.
     */
    BinaryNode * clone( BinaryNode *t ) const
    {
        if( t == NULL )
            return NULL;
 
        return new BinaryNode( t->element, clone( t->left ), clone( t->right ) );
    }