fig04_19.cpp

来自「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).」· C++ 代码 · 共 32 行

template <typename Object, typename Comparator=less<Object> >
class BinarySearchTree
{
  public:

    // Same methods, with Object replacing Comparable

  private:

    BinaryNode *root;
    Comparator isLessThan;

    // Same methods, with Object replacing Comparable

    /**
     * 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 Object & x, BinaryNode *t ) const
    {
        if( t == NULL )
            return false;
        else if( isLessThan( x, t->element ) )
            return contains( x, t->left );
        else if( isLessThan( t->element, x ) )
            return contains( x, t->right );
        else
            return true;    // Match
    }
};