Hi.
I've implemented output stream using boost.iostreams library. It requires call
to flush in order to actually write data to sink. But I want to flush data to
sink automatically after I write any object with operator<<.
struct stream_sink : public boost::iostreams::sink
{
stream_sink(std::ostream & strm) : strm_(strm) {}
std::streamsize write(const char * s, std::streamsize n)
{
if (strm_.write(s, n))
return n;
else
throw std::runtime_error("error");
}
private:
std::ostream & strm_;
};
std::stringstream s;
boost::iostreams::stream strm(s);
strm << "abc";
strm.flush();
std::cout << "String: '" << s.str() << "'" << std::endl;
This test outputs "String: 'abc'" but if you comment strm.flush() then it
outputs "String: ''".
I want my stream to work like the stringstream does (it does not require call
to flush).
std::stringstream strm;
strm << "abc";
std::string s;
strm >> s;
std::cout << "String: '" << s << "'" << std::endl;
It outputs "String: 'abc'".
I need it to create stream which can be used to convert wide char data
(wchar_t *) to multibyte (char *). It can be used this way:
// wcstombsstream is wostream and istream
// "utf-8" is multibyte encoding
wcstombsstream strm("utf-8");
strm << L"abc";
std::string s;
strm >> s;
This code does not work at the moment because it requires to call strm.flush()
before reading from stream. Thus I need some auto flush facility :-)
Thank you for any help,
Roman Perepelitsa.
