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电梯直达

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发表于 2009-07-28 13:50 |显示全部楼层 |倒序浏览

class MyString {
 private:
  const char * c_string_;
  const MyString& operator=(const MyString& rhs);

 public:

  // Clones a 0-terminated C string, allocating memory using new.

  static const char * CloneCString(const char * c_string);

  ////////////////////////////////////////////////////////////

  //

  // C'tors

  // The default c'tor constructs a NULL string.

  MyString() : c_string_(NULL) {}

  // Constructs a MyString by cloning a 0-terminated C string.

  explicit MyString(const char * c_string) : c_string_(NULL) {
    Set(c_string);
  }

  // Copy c'tor

  MyString(const MyString& string) : c_string_(NULL) {
    Set(string.c_string_);
  }

  ////////////////////////////////////////////////////////////

  //

  // D'tor. MyString is intended to be a final class, so the d'tor

  // doesn't need to be virtual.

  ~MyString() { delete[] c_string_; }

  // Gets the 0-terminated C string this MyString object represents.

  const char * c_string() const { return c_string_; }

  size_t Length() const {
    return c_string_ == NULL ? 0 : strlen(c_string_);
  }

  // Sets the 0-terminated C string this MyString object represents.

  void Set(const char * c_string);
};

  // Copy c'tor

  MyString(const MyString& string) : c_string_(NULL) {
Set(string.c_string_);
  }

这个Set函数中的参数访问了私有成员吧？能解释下这是啥用法么？