#include <iostream>
#include <string.h>

char* m_str;

void SetData(char* str) {
    m_str = str;
}

const char* GetData() {
    std::string sTemp;
    sTemp = m_str;
    return sTemp.c_str();
}

int main() {

    SetData("Hello, World!");
    const char* str = GetData();
    SetData("tralala");
    std::cout << str << std::endl;

    return 0;
}