问为什么我的类不可访问，而我包含了头文件

EN

MyString* m_pStr; // Link to a dynamically created string.
MyString* pPrev; // Pointer to the next counter.

#pragma once
#include <iostream>
#include "counter.h"

using namespace std;
class MyString
{
    char* m_pStr;   //String which is a member of the class.
    void CreateArray(const char * pStr);
    Counter* m_pMyCounter; // Pointer to its own counter. 

    public:
        MyString(const char* pStr = "");
        MyString(const MyString & other);
        MyString(MyString && other);
        ~MyString();

        const char * GetString();
        void SetNewString(char * str);

        void printAllStrings(); 
        void ChangeCase();
        void printAlphabetically();
};

#include "myString.h"
#include <iostream>
using namespace std;


MyString::MyString(const char* pStr){   
    this->CreateArray(pStr);
    strcpy(m_pStr, pStr);   
};
void MyString:: CreateArray(const char * pStr){
    int size_of_string = strlen(pStr)+1;    
    m_pStr = new char[size_of_string];  
}

MyString::MyString(const MyString & other){
    this->CreateArray(other.m_pStr);
    strcpy(m_pStr, other.m_pStr);
}

MyString::MyString(MyString && other){
    this->m_pStr = other.m_pStr;
    other.m_pStr = nullptr; 
}

MyString::~MyString(){
    delete[] m_pStr;
}

const char * MyString:: GetString(){
    return m_pStr;
}

void MyString:: SetNewString(char * str){
    this->CreateArray(str);
    strcpy(m_pStr, str);
}

#pragma once
#include "myString.h"
#include <iostream>
using namespace std;

class Counter{
    private:
        MyString* m_pStr; // Link to a dynamically created string.
        int m_nOwners; // Counter of users of this string.
        MyString* pPrev; // Pointer to the next counter.
    public:
        Counter(); 
        //Copy constructor.
        ~Counter();
        void AddUser();
        void RemoveUser();
};