2005年07月01日
stream wrapper
ファイル名として "-" を指定したときに標準入出力として
扱うプログラムがあります。 (wget など)
それを C++ の fstream で実現したくて、以下のwrapper を書いてみますた。
class istream_wrapper {
private:
std::istream* is;
public:
std::istream &operator*() const { return *is; }
std::istream *operator->() const { return is; }
istream_wrapper(const char* filename): is(0)
{
if (std::strcmp(filename, "-") == 0)
is = &std::cin;
else
is = new std::ifstream(filename);
}
~istream_wrapper()
{
if (is != &std::cin) delete is;
}
};
* と -> を overload しているので、あたかも stream のポインタのように動作します。また、デストラクタで delete するので、スコープを抜けると自動的に close します。
これをもっと極めれば、文字列ストリーム、socket, pipe といった stream を
透過的に扱えるようなファクトリが作れそうです。
投稿者 taku : 2005年07月01日 00:25
トラックバック
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http://chasen.org/~taku/blog/mt-tb.cgi/148
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