迷途知返

#include using namespace std; class MyString { public: MyString(char *ptr=NULL); ~MyString(); friend ostream& operator { if (str.m_data != NULL) out return out; } private: char* m_

#include using namespace std; class MyString { public: MyString(char *ptr=NULL); ~MyString(); MyString(const MyString& other); MyString& operator=(const MyString& other); friend ostream& operato