fig04_18.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).

    /**
     * Internal method to test if an item is in a subtree.
     * x is item to search for.
     * t is the node that roots the subtree.
     */
    bool contains( const Comparable & x, BinaryNode *t ) const
    {
        if( t == NULL )
            return false;
        else if( x < t->element )
            return contains( x, t->left );
        else if( t->element < x )
            return contains( x, t->right );
        else
            return true;    // Match