当我将根变量作为默认参数写入以下函数时,我对根变量的非静态数据成员的使用无效。
class Leaf {
Item* data;
Leaf* parent;
Leaf* left;
Leaf* right;
friend class binaryTree;
Leaf(Item* data, Leaf* parent = 0, Leaf* left = 0, Leaf* right = 0) :
data(data), parent(parent), left(left), right(right) {
}
~Leaf() {
delete left;
delete right;
}
};
class binaryTree {
Leaf* root;
public:
binaryTree() :
root(0) {
}
~binaryTree() {
delete root;
}
void insert(Item* data, Leaf* &node = root) {
if (!node) {
node = new Leaf(data);
} else {
if (data->neptun < node->data->neptun) {
insert(data, node->left);
} else {
insert(data, node->right);
}
}
}
void listForward(Leaf* node = root) {
if (!node) {
listForward(node->left);
cout<<" "<<node->data->neptun;
listForward(node->right);
}
}
};
我怎样才能解决这个问题?我不喜欢做一个解决方法,比如制作这些私有函数并通过另一个函数调用它们,参数中只有根。提前致谢。