Re: [Boost-users] [iostreams] How to make a seekable device seek

Subject: Re: [Boost-users] [iostreams] How to make a seekable device seek
From: Bo Jensen (jensen.bo_at_[hidden])
Date: 2010-04-30 02:06:13

After sleeping on it, i figured it out. It was a dumb mistake, I
thought you could use standard seek functions, but you need to use
iostreams functions.

boost::iostreams::seek(buf, boost::iostreams::position_to_offset(0),
std::ios_base::beg);

Then it correctly calls my seek function.

On Thu, Apr 29, 2010 at 11:10 PM, Bo Jensen <jensen.bo_at_[hidden]> wrote:
> I have a seekable iostream device with the tag set to :
>
>     typedef boost::iostreams::input_seekable catagory;
>
> If I have not defined the functions get and seek, it will not compile,
> which is expected, so far so good.
> But when I called it like this :
>
>          mydevice test("somefile.txt");
>
>          boost::iostreams::stream<mydevice> buf(test);
>
>          buf.seekg(0);
>
> it never enters my seek function, which I would expect. I am sure the
> solution must be obvious. Any pointers here ?
>