/// Like std::istream::operator bool()
/// Do not convert is_ implicitly to bool, since that is forbidden in C++11.
explicit operator bool() const { return s_.empty() ? !is_.fail() : true; }
/// Like std::istream::operator bool()
/// Do not convert is_ implicitly to bool, since that is forbidden in C++11.
explicit operator bool() const { return s_.empty() ? !is_.fail() : true; }
/// change the encoding of the input stream to \p e (iconv name)
void setEncoding(std::string const & e);
/// change the encoding of the input stream to \p e (iconv name)
void setEncoding(std::string const & e);