为C++中的无序映射获取给定输入键的错误值

我正在尝试使用自定义构建的哈希函数将对象存储在无序映射中，下面是代码，

#include <iostream>
#include <unordered_map>
#include <string>
//Class that I want to store in unordered map
class Tree{
public:
int val;
std::pair<int,int> location;
Tree(int val,std::pair<int,int> location){
this->location = location;
this->val = val;}
};

//I guess this operator is internally used by the unordered map to compare the Values in the maps. 
//This function returns True only when the val of both the nodes are equal.
bool operator ==(const Tree& node1, const Tree& node2){
return node1.val == node2.val;}
//Custom build Hash Function for assigning Keys to the Values.
class HashFunction{
public:
size_t operator()(const Tree& node) const{
std::hash<int> Hash;
return Hash(node.val);
}
};
//Created a class dictionary using the std::unordered_map to store the objects.
class dictionary{
public:
std::unordered_map<Tree,Tree*,HashFunction> dict;
void append(Tree node){
this->dict[node] = &node;}
Tree* get(Tree node){
return this->dict[node];}
};

int main(){
Tree obj1(1,std::make_pair(1,6));
Tree obj2(2,std::make_pair(2,5));
Tree obj(2,std::make_pair(3,4));
dictionary dict;
dict.append(obj1);
dict.append(obj2);

std::cout<<"#################"<<std::endl;  
std::cout<<dict.get(obj)->location.first<<std::endl;    
}

获得的结果是">3"(如obj.val(，而不是">2(如obj2.val("。

我在主函数中创建了三个对象，即Tree类obj1、obj2和obj。obj1和obj2存储在字典中，obj用于检查字典中的匹配对象。由于Hash函数使用对象的val来创建Key，因此obj2和obj都将具有相同的Key，但当我试图以obj作为输入访问字典时，字典应该返回obj2，而我得到的是不在字典中的obj，我不明白为什么会发生这种情况。如有任何建议，我们将不胜感激。提前感谢：(