strings.h

来自「Thinking in C++ 2nd edition source code 」· C头文件 代码 · 共 40 行

//: C13:Strings.h
// From Thinking in C++, 2nd Edition
// at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Simple string class
// Can only be built on the heap
#ifndef STRINGS_H_
#define STRINGS_H_
#include <cstring>
#include <iostream>

class String {
  char* s;
  String(const char* S) {
    s = new char[strlen(S) + 1];
    std::strcpy(s, S);
  }
  // Prevent copying:
  String(const String&);
  void operator=(String&);
public:
  // Only make Strings on the heap:
  friend String* makeString(const char* S) {
    return new String(S);
  }
  // Alternate approach:
  static String* make(const char* S) {
    return new String(S);
  }
  ~String() { delete s; }
  operator char*() const { return s;}
  char* str() const { return s; }
  friend std::ostream&
    operator<<(std::ostream& os, const String& S) {
      return os << S.s;
  }
};
#endif // STRINGS_H_ ///:~