From: Jonathan Turkanis (technews_at_[hidden])
Date: 2004-08-24 11:59:59
"Jonathan Turkanis" <technews_at_[hidden]> wrote in message
news:cgem4t$r20$1_at_sea.gmane.org...
>
> "Pavel Vozenilek" <pavel_vozenilek_at_[hidden]> wrote in message:
> > - 'tee' like output stream, they take data and re-send
> > them all into two other streams
> struct tee : boost::io::output_filter {
> tee(std::ostream& dest) : dest(dest) { }
>
> template<typename Sink>
> void write(Sink& snk, char* s, std::streamsize n)
> {
> // Write to the downstream Sink
> boost::io::write(snk, s, n);
>
> // Write to the stored ostream:
> dest.write(s, n);
> }
>
> std::ostream& dest;
> };
Better:
struct tee : boost::io::sink {
tee(std::ostream& first, std::ostream& second)
: first(first), second(second)
{ }
void write(const char* s, std::streamsize n)
{
first.write(s, n);
second.write(s, n);
}
std::ostream& first;
std::ostream& second;
};
std::ostream first;
std::ostream second;
boost::io::stream_facade<tee> out(tee(first, second));
out << "This is simpler and more efficient\n";
Jonathan