Re: [Boost-users] How to use filtering streams with cin?

Subject: Re: [Boost-users] How to use filtering streams with cin?
From: Larry Evans (cppljevans_at_[hidden])
Date: 2011-11-16 06:39:10

On 11/15/11 22:26, Jayden Shui wrote:
> Hello All,
> 
> I have trouble in using filtering streams with cin in the following code:
> 
> #include <boost/iostreams/filtering_stream.hpp>
> #include <iostream>
> 
> namespace io = boost::iostreams;
> 
> int main()
> {
>     io::filtering_istream in;
>     in.push(std::cin);
> 
>     int i;
>     in >> i;
>     std::cout << i << '\n';
>     in >> i;
>     std::cout << i << '\n';   
> }
> 
> I have to input two integers and ctrl+z to terminate the input from
> screen. How can I input 1 integer, output it, then input another one and
> output it, which like the conventional std::cin?
> 
Hi Jayden,

It sounds like filtering_istream, in, is buffering its input.
Is there some filtering_istream option for unbuffered input?
If so, try that.

HTH,

-Larry