Jean-Marc Lasgouttes wrote:
>>>>>> "Angus" == Angus Leeming <[EMAIL PROTECTED]>
>>>>>> writes:
>
> Angus> It looks to me like you're describing formatting flags (iomanip
> Angus> thingies) rather than member functions as they affect only the
> Angus> next piece of input rather than everything thereafter.
>
> You are right.
>
> Angus> They are actually dead easy to implement. Below is the g++
> Angus> implementation of 'setw'
>
> Urgh. You meant dead unreadable, right?
Nonsense. Ignore the leading underscores. All it does is:
1. Define a struct Setw with a single int member variable:
struct Setw {
int w;
}
2. Define a maipulator that returns a Setw object:
Setw setw(int w) {
Setw sw;
sw.w = w;
return sw;
}
3. Define an operator<< that receives an ostream and a Setw object in order
to set the width variable of the ostream:
std::ostream & operator<<(std::ostream & os, Setw const & sw)
{
os.width(sw.w);
return os;
}
What's hard about that?
> Angus> However, I don't think that we need to define a new
> Angus> olatexstream with member functions unwantedligature() etc. That
> Angus> would be difficult because sometimes we'd want olatexstream to
> Angus> derive from ofstream, sometimes from ostringstream, etc.
>
> I planned to use the basic stupid way of passing a ostream in the
> constructor as the underlying stream.
Good idea actually and not stupid at all. You'll still need the above, but
operator<< will take an olatexstream as it's first argument. I see.
> Angus> For the way forward, see
>
> Angus>
> http://www.awprofessional.com/articles/article.asp?p=171014&seqNum=2
>
> It looks a bit like a hack, don't you think? Especially since I need
> more that longs and casting all over the place is ugly. Or I could use
> this long to a pointer (is this always possible) to a structure
> containing my entries.
I don't think that the xalloc, iword, pword stuff is a hack. Their
interface to it and to using it is, but that's another thing.
Anyway, your way is much nicer, and I hope you now see that it's very easy
to implement.
--
Angus
