成员函数看不到该类的私有成员

Question

成员函数（reverseString()）必须旋转字符串，但是当我创建并尝试在成员函数（char *temporary = stringo;）中初始化新指针时，显然它看不到该成员。类（虽然不是全部代码）。

#include"Header.h"
#include<iostream>

using namespace std;

Stringfuncs::Stringfuncs(char *string)
{
this->stringo = string;
}

int Stringfuncs::lengthString()
{
int counter = 0;

for (int i = 0; stringo[i]; i++) { counter++; }

return counter;
}

char Stringfuncs::*reverseString()   //this function doesn't see the member of the class
{
char *temporary = stringo;  //identifier "stringo" isn't defined
}