sample:

//part A//tmp.hpp#ifndef TEMP_HPP#define TEMP_HPPclass tmp {      public:              void print();       private:               std::string str2;};#endif

 

// part B//tmp.cpp#include 
     
      #include "tmp.hpp"#include "test.hpp"using namespace std;void tmp::print() {    str2 = " this is the tmp print func";    cout << str2 << endl;    test::show();}int main() {    tmp temp;    temp.print();    return 0;}
     

 

//part C//test.hpp #ifndef TEST_HPP#define TEST_HPP#include 
     
      using namespace std;class test {    test();    ~test();    public:    static void show();    //private://    string str;};#endif
     

 

//part D//test.cpp #include 
     
      #include "test.hpp"using namespace std;test::test() {//    str = "this is test";}test::~test() {}void test::show() {    string str = "this is test func";    cout << str << endl;}
     

为了能在tmp::print()调用test::show()函数

需要在tmp.cpp中调用 "test.hpp"

且test::show()的定义必须为 static;

 

编译命令:

gcc -o main tmp.cpp test.cpp

运行结果如下:

$ ./main this is the tmp print functhis is test func