通过user_string类，来看如何撰写构造函数。

通过user_string类，来看如何撰写构造函数。

#include #include class user_string{public : user_string(); user_string(const char *src); user_string(const user_string &other); user_string &operator = (const user_string &other); ~user_string(); void show();private: char *m_pdata;};user_string::user_string(){}user_string::user_string(const user_string &other){}user_string::user_string(const char*src){ if ( src == NULL ) { m_pdata = new char[1]; m_pdata[0] = '

#include #include class user_string{public : user_string(); user_string(const char *src); user_string(const user_string &other); user_string &operator = (const user_string &other); ~user_string(); void show();private: char *m_pdata;};user_string::user_string(){}user_string::user_string(const user_string &other){}user_string::user_string(const char*src){ if ( src == NULL ) { m_pdata = new char[1]; m_pdata[0] = '\0'; } else m_pdata = new char [strlen(src) + 1]; strcpy(m_pdata, src);}user_string::~user_string(){ delete []m_pdata;}user_string & user_string::operator = (const user_string &other){ if ( this == &other ) return *this; delete []m_pdata; m_pdata = new char[strlen(other.m_pdata) + 1]; strcpy(m_pdata, other.m_pdata); return * this;} void user_string::show(){ printf("%s", m_pdata);}void main(){ user_string a("123"); user_string b("456"); b = b; b = a; //b = a; }

'; } else m_pdata = new char [strlen(src) + 1]; strcpy(m_pdata, src);}user_string::~user_string(){ delete []m_pdata;}user_string & user_string::operator = (const user_string &other){ if ( this == &other ) return *this; delete []m_pdata; m_pdata = new char[strlen(other.m_pdata) + 1]; strcpy(m_pdata, other.m_pdata); return * this;} void user_string::show(){ printf("%s", m_pdata);}void main(){ user_string a("123"); user_string b("456"); b = b; b = a; //b = a; }

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