Re: [boost] [container][memory] Request to move allocator_arg_t and uses_allocator to a memory related file.

Subject: Re: [boost] [container][memory] Request to move allocator_arg_t and uses_allocator to a memory related file.
From: Vicente J. Botet Escriba (vicente.botet_at_[hidden])
Date: 2012-03-31 08:48:05

Le 31/03/12 12:04, Ion Gaztañaga a écrit :
> El 31/03/2012 11:03, Vicente J. Botet Escriba escribió:
>> I see that Boost.Container has already defined in namespace
>> boost::container and in file boost/container/scoped_allocator.hpp the
>> following
>>
>> struct allocator_arg_t { };
>> constexpr allocator_arg_t allocator_arg = allocator_arg_t();
>>
>> template <class T, class Alloc> struct uses_allocator;
>
> There is no constexpr in Boost.Container code. Current trunk code 
> includes an experimental implementation of scoped_allocator, for C++03 
> and C++11 compilers.
>
>> I would like to shared these to all the Boost libraries. I don't think
>> it is a good idea to make Boost.Thread depend on Boost.Container just
>> for this. Could these declarations be included in a specific file? These
>> declaration are included in <memory> in the C++11. What would be the
>> best library to contain these declarations?
>
> I don't think Boost.thread should depend on Boost.Container, that's 
> why I've added those classes to boost::container namespace, avoiding 
> any boost:: namespace pollution. The idea is also to define them as 
> std:: typedefs so that a user with a C++11 conforming standard library 
> does not need to add boost::container::xxx overloads. And user C++03 
> code using boost::xxx types is standard conforming when compiled with 
> C++11 compilers.
Have you a plan to add these definitions at the boost level?
>
>> What about a new boost/memory.hpp file?
>> What about moving them to the boost or boost::memory namespace?
>
> I think it's a good idea. But we should just typedef them to std:: if 
> the standard library provides those types. I think GCC 4.7 libstdc++ 
> and libc++ already support scoped allocators.
>
Let me know if I can help on this.

Best,
Vicente