sstream

来自「算断裂的」· 代码 · 共 53 行

#include <strstream.h>

namespace std {
  class ostringstream;
  class istringstream;
}

class std::ostringstream : public std::ostrstream {
public:
  ostringstream() { }
  ~ostringstream() { }
  std::string str() const {
    char* tmp = 
      const_cast<ostrstream*>(static_cast<const ostrstream*>(this)) -> str();
    int l =  const_cast<ostringstream*>(this) -> rdbuf() -> pcount();
    string s(tmp, l);
    const_cast<ostringstream*>(this) -> freeze(0);
    return s;
  }
};

class istringstream_helper {
private:
  char* s_;
public:
  istringstream_helper(const string& s) {
    int l = s.length();
    s_ = new char[l + 1];
    s.copy(s_,l);
    s_[l] = 0;
  }
  char* charptr() { return s_;}
  ~istringstream_helper() {
    delete[] s_;
  }
};


class std::istringstream : public istringstream_helper,
	   public std::istrstream {
private:
  char* buf_;
public:
  istringstream(const string& s) : 
    istringstream_helper(s),
    istrstream(charptr())
    { }
};