c++ primer 13.2.2 13.28

//main.cpp
#include<iostream>
#include"TreeNode.h"
#include"BinStrTree.h"
using namespace std;
int main()
{
TreeNode t1;
TreeNode t2(t1);
BinStrTree b1;
BinStrTree b2(b1);
system("pause");
return 0;

}

//BinStrTree.h
#pragma once
#include"TreeNode.h"
class BinStrTree
{
public:
BinStrTree() = default;
BinStrTree(const BinStrTree&);
private:
TreeNode *root = new TreeNode();
};
BinStrTree::BinStrTree(const BinStrTree& p)
{
*root = *p.root;
}

//TreeNode.cpp
#include"TreeNode.h"
TreeNode::TreeNode(const TreeNode& p):value(p.value),count(p.count),left(NULL),right(NULL)
{
if (NULL != p.left)
left = new TreeNode(*p.left);
if (NULL != p.right)
right = new TreeNode(*p.right);
}

//TreeNode.h
#pragma once
#include<string>
using namespace std;
class TreeNode
{
public:
TreeNode() = default;
TreeNode(const TreeNode&);
private:
string value;
int count;
TreeNode *left;
TreeNode *right;
};

最后

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