Re: [Boost-users] Using boost::lambda::bind with std::transform

From: Kobi Cohen-Arazi (kobi.cohenarazi_at_[hidden])
Date: 2006-04-26 20:01:26

Hi,

I've tried that, and I got a bunch of errors. I'm using boost::bind for
that, not boost::lambda.
Here is the error

The following line:
std::transform(array.begin(), array.end(), std::back_inserter(tr),
  bind(&std::string::replace, bind(&Foo::get, _1), 0, 5, ""));

generates:
error: no matching function for call to 'bind(<unknown type>,
boost::_bi::bind_t<const std::string&, boost::_mfi::cmf0<const std::string&,
Foo>, boost::_bi::list1<boost::arg<1> > >, int, uint32_t&, const char [1])'

Kobi.

On 4/26/06, Sebastian Redl <sebastian.redl_at_[hidden]> wrote:
>
> Kobi Cohen-Arazi wrote:
>
> > std::vector<Foo> array; // say it is already populated
> > std::vector<std::string> tr; // the transformed
> > instead using my handcrafted for loop, I would like to transform the
> >             std::list<Foo>::iterator endIter=array.end ();
> >             for (std::list<Foo>::iterator iter=array.begin();
> > iter!=endIter ;++iter)
> >             {
> >                 noExtResults.push_back (iter.get().replace (0,5, ""));
> >             }
> >
> > I know it should be something like:
> > std::transform (array.begin(), array.end (), std::back_inserter(tr),
> >                       bind(&Foo::get, _1));
> >
> > So here I'm stuck. The bind function will know to extract the string
> > using get. But how to I get that string and do something like:
> > bind(&std::string::replace (???))
>
> I'd use straight Boost.Bind, not Lambda. But the syntax is the same:
>
> std::transform(array.begin(), array.end(), std::back_inserter(tr),
>   bind(&std::string::replace, bind(&Foo::get, _1), 0, 5, ""));
>
> Or you could use one of the special iterators from Boost.Iterator
> instead of the nested bind.
>
> Sebastian Redl
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