#ifndef __MYSTRING__ #define __MYSTRING__ class String { public: String(const char* cstr=0); String(const String& str); String& operator=(const String& str); ~String(); char* get_c_str() const { return m_data; } private: char* m_data; }; #include <cstring> inline String::String(const char* cstr) { if (cstr) { m_data = new char[strlen(cstr)+1]; strcpy(m_data, cstr); } else { m_data = new char[1]; *m_data = '\0'; } } inline String::~String() { delete[] m_data; } inline String& String::operator=(const String& str) { if (this == &str) return *this; delete[] m_data; m_data = new char[ strlen(str.m_data) + 1 ]; strcpy(m_data, str.m_data); return *this; } inline String::String(const String& str) { m_data = new char[ strlen(str.m_data) + 1 ]; strcpy(m_data, str.m_data); } #include <iostream> using namespace std; ostream& operator<<(ostream& os, const String& str) { os << str.get_c_str(); return os; } #endif
#include "string.h" #include <iostream> using namespace std; intmain() { String s1("hello"); String s2("world"); String s3(s2); cout << s3 << endl; s3 = s1; cout << s3 << endl; cout << s2 << endl; cout << s1 << endl; }