Nick Stokes <randomaccessiterator <at> gmail.com> writes:
>
> Q1: Is there a builtin in way in MI to iterate over keys rather
> than elements? I.e. the iterator's value type will be that of the
> key, not the element.
No, there's none. Some iterator adaption is needed as you mention
below.
> Q2: Is there a way to obtain the type of key extractors given a
> multi index container? (it is related to Q1, as this sort of a
> thing could be passed to boost::transform iterator to obtain an
> alternative answer for Q1)
auto beg=boost::make_transform_iterator(
foos.get<1>().begin(),foos.get<1>().key_extractor()),
end=boost::make_transform_iterator(
foos.get<1>().end(),foos.get<1>().key_extractor());
std::copy(
beg,end,std::ostream_iterator<std::string>(std::cout," "));
Joaquín M López Muñoz
Telefónica
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