Subject: Re: [boost] Range begin/end and Fusion begin/end
From: Jeffrey Hellrung (jhellrung_at_[hidden])
Date: 2010-03-19 12:20:35
Mathias Gaunard wrote:
> Steven Watanabe wrote:
>
>>> Of course, keeping the names begin and end for fusion means we won't
>>> be able to have a range that is at the same time a fusion sequence,
>>> even though that could be somewhat useful.
>>
>> Hmm. I think it works just fine for boost::array, since fusion::begin
>> won't be found by ADL.
>
> It *may* be found by ADL. Consider the following:
>
> #include <boost/array.hpp>
> #include <boost/fusion/container/vector.hpp>
> #include <boost/fusion/sequence/intrinsic/end.hpp>
> #include <boost/fusion/adapted/array.hpp>
> #include <boost/range.hpp>
>
> int main()
> {
> boost::array<boost::fusion::vector<>, 42> foo;
> begin(foo); // ambiguous, boost::begin or boost::fusion::begin
> }
>
>
> Namespaces of template arguments are also considered for ADL. (Yes,
> that's a terrible rule -- no idea why it was coined)
Rename boost::fusion::begin/end to
boost::fusion::some_other_namespace::begin/end ???