[mpl] Modularization pull request

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[mpl] Modularization pull request

Andrey Semashev-2
Hi,

I've created this pull request:

https://github.com/boostorg/mpl/pull/11

to separate core components of Boost.MPL to a sub-library. The intent of this
pull request is to reduce dependencies added by MPL to its dependent
libraries, when only the basic MPL components are required. In particular, it
should help resolving circular dependency between MPL and TypeTraits.

Please, have a look at the list of moved components and let me know if you
have any comments.


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Re: [mpl] Modularization pull request

Andrey Semashev-2
On Sunday 31 August 2014 15:17:56 you wrote:

> Hi,
>
> I've created this pull request:
>
> https://github.com/boostorg/mpl/pull/11
>
> to separate core components of Boost.MPL to a sub-library. The intent of
> this pull request is to reduce dependencies added by MPL to its dependent
> libraries, when only the basic MPL components are required. In particular,
> it should help resolving circular dependency between MPL and TypeTraits.
>
> Please, have a look at the list of moved components and let me know if you
> have any comments.

Seems there are no comments or objections, and the Jamroot file is already
fixed. Could this pull request be merged?


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Re: [mpl] Modularization pull request

Vicente Botet
Le 03/09/14 19:50, Andrey Semashev a écrit :

> On Sunday 31 August 2014 15:17:56 you wrote:
>> Hi,
>>
>> I've created this pull request:
>>
>> https://github.com/boostorg/mpl/pull/11
>>
>> to separate core components of Boost.MPL to a sub-library. The intent of
>> this pull request is to reduce dependencies added by MPL to its dependent
>> libraries, when only the basic MPL components are required. In particular,
>> it should help resolving circular dependency between MPL and TypeTraits.
>>
>> Please, have a look at the list of moved components and let me know if you
>> have any comments.
> Seems there are no comments or objections, and the Jamroot file is already
> fixed. Could this pull request be merged?
>
>
>
Andrey, there are a lot of changes in your PR. Are all really needed?
What would be on Boost.MPL?

Vicente

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Re: [mpl] Modularization pull request

Andrey Semashev-2
On Wednesday 03 September 2014 20:04:08 Vicente J. Botet Escriba wrote:

> Le 03/09/14 19:50, Andrey Semashev a écrit :
> > On Sunday 31 August 2014 15:17:56 you wrote:
> >> Hi,
> >>
> >> I've created this pull request:
> >>
> >> https://github.com/boostorg/mpl/pull/11
> >>
> >> to separate core components of Boost.MPL to a sub-library. The intent of
> >> this pull request is to reduce dependencies added by MPL to its dependent
> >> libraries, when only the basic MPL components are required. In
> >> particular,
> >> it should help resolving circular dependency between MPL and TypeTraits.
> >>
> >> Please, have a look at the list of moved components and let me know if
> >> you
> >> have any comments.
> >
> > Seems there are no comments or objections, and the Jamroot file is already
> > fixed. Could this pull request be merged?
>
> Andrey, there are a lot of changes in your PR. Are all really needed?

Yes. These are mostly files moving around, the code is mostly unchanged.

> What would be on Boost.MPL?

I've listed things that were moved to MPL.Core in the PR description, the rest
is left in MPL. That is mostly functional stuff, containers, iterators and
algorithms.


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Re: [mpl] Modularization pull request

Vicente Botet
Le 03/09/14 21:43, Andrey Semashev a écrit :

> On Wednesday 03 September 2014 20:04:08 Vicente J. Botet Escriba wrote:
>> Le 03/09/14 19:50, Andrey Semashev a écrit :
>>> On Sunday 31 August 2014 15:17:56 you wrote:
>>>> Hi,
>>>>
>>>> I've created this pull request:
>>>>
>>>> https://github.com/boostorg/mpl/pull/11
>>>>
>>>>
>>>>
What are the dependencies that this split breaks?

What are the dependencies MPL.Core?

Vicente

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Re: [mpl] Modularization pull request

Andrey Semashev-2
On Wednesday 03 September 2014 23:39:47 Vicente J. Botet Escriba wrote:

> Le 03/09/14 21:43, Andrey Semashev a écrit :
> > On Wednesday 03 September 2014 20:04:08 Vicente J. Botet Escriba wrote:
> >> Le 03/09/14 19:50, Andrey Semashev a écrit :
> >>> On Sunday 31 August 2014 15:17:56 you wrote:
> >>>> Hi,
> >>>>
> >>>> I've created this pull request:
> >>>>
> >>>> https://github.com/boostorg/mpl/pull/11
>
> What are the dependencies that this split breaks?
>
> What are the dependencies MPL.Core?

MPL.Core headers only depend on Config, Preprocessor and Core. MPL adds
TypeTraits, Predef, StaticAssert and Utility.


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Re: [mpl] Modularization pull request

Andrey Semashev-2
On Thursday 04 September 2014 06:52:06 you wrote:

> On Wednesday 03 September 2014 23:39:47 Vicente J. Botet Escriba wrote:
> > Le 03/09/14 21:43, Andrey Semashev a écrit :
> > > On Wednesday 03 September 2014 20:04:08 Vicente J. Botet Escriba wrote:
> > >> Le 03/09/14 19:50, Andrey Semashev a écrit :
> > >>> On Sunday 31 August 2014 15:17:56 you wrote:
> > >>>> Hi,
> > >>>>
> > >>>> I've created this pull request:
> > >>>>
> > >>>> https://github.com/boostorg/mpl/pull/11
> >
> > What are the dependencies that this split breaks?
> >
> > What are the dependencies MPL.Core?
>
> MPL.Core headers only depend on Config, Preprocessor and Core. MPL adds
> TypeTraits, Predef, StaticAssert and Utility.

Actually, the dependency of MPL.Core on Core is only through the testing code
and thus can be removed if I move the code to the tests subdirectory. I can do
that tonight. MPL will still depend on Core on its own though.


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Re: [mpl] Modularization pull request

Andrey Semashev-2
On Thursday 04 September 2014 07:43:40 you wrote:
> On Thursday 04 September 2014 06:52:06 you wrote:
> > On Wednesday 03 September 2014 23:39:47 Vicente J. Botet Escriba wrote:
> > > Le 03/09/14 21:43, Andrey Semashev a écrit :
> > > > On Wednesday 03 September 2014 20:04:08 Vicente J. Botet Escriba
wrote:

> > > >> Le 03/09/14 19:50, Andrey Semashev a écrit :
> > > >>> On Sunday 31 August 2014 15:17:56 you wrote:
> > > >>>> Hi,
> > > >>>>
> > > >>>> I've created this pull request:
> > > >>>>
> > > >>>> https://github.com/boostorg/mpl/pull/11
> > >
> > > What are the dependencies that this split breaks?
> > >
> > > What are the dependencies MPL.Core?
> >
> > MPL.Core headers only depend on Config, Preprocessor and Core. MPL adds
> > TypeTraits, Predef, StaticAssert and Utility.
>
> Actually, the dependency of MPL.Core on Core is only through the testing
> code and thus can be removed if I move the code to the tests subdirectory.
> I can do that tonight. MPL will still depend on Core on its own though.

Done.


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Re: [mpl] Modularization pull request

Andrey Semashev-2
On Thursday 04 September 2014 23:49:15 you wrote:

> On Thursday 04 September 2014 07:43:40 you wrote:
> > On Thursday 04 September 2014 06:52:06 you wrote:
> > > On Wednesday 03 September 2014 23:39:47 Vicente J. Botet Escriba wrote:
> > > > Le 03/09/14 21:43, Andrey Semashev a écrit :
> > > > > On Wednesday 03 September 2014 20:04:08 Vicente J. Botet Escriba
>
> wrote:
> > > > >> Le 03/09/14 19:50, Andrey Semashev a écrit :
> > > > >>> On Sunday 31 August 2014 15:17:56 you wrote:
> > > > >>>> Hi,
> > > > >>>>
> > > > >>>> I've created this pull request:
> > > > >>>>
> > > > >>>> https://github.com/boostorg/mpl/pull/11
> > > >
> > > > What are the dependencies that this split breaks?
> > > >
> > > > What are the dependencies MPL.Core?
> > >
> > > MPL.Core headers only depend on Config, Preprocessor and Core. MPL adds
> > > TypeTraits, Predef, StaticAssert and Utility.
> >
> > Actually, the dependency of MPL.Core on Core is only through the testing
> > code and thus can be removed if I move the code to the tests subdirectory.
> > I can do that tonight. MPL will still depend on Core on its own though.
>
> Done.

So, could someone merge the pull request, please?


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Re: [EXTERNAL] Re: [mpl] Modularization pull request

Belcourt, Kenneth

On Sep 10, 2014, at 2:12 PM, Andrey Semashev <[hidden email]> wrote:

> On Thursday 04 September 2014 23:49:15 you wrote:
>> On Thursday 04 September 2014 07:43:40 you wrote:
>>> On Thursday 04 September 2014 06:52:06 you wrote:
>>>> On Wednesday 03 September 2014 23:39:47 Vicente J. Botet Escriba wrote:
>>>>> Le 03/09/14 21:43, Andrey Semashev a écrit :
>>>>>> On Wednesday 03 September 2014 20:04:08 Vicente J. Botet Escriba
>>
>> wrote:
>>>>>>> Le 03/09/14 19:50, Andrey Semashev a écrit :
>>>>>>>> On Sunday 31 August 2014 15:17:56 you wrote:
>>>>>>>>> Hi,
>>>>>>>>>
>>>>>>>>> I've created this pull request:
>>>>>>>>>
>>>>>>>>> https://github.com/boostorg/mpl/pull/11
>>>>>
>>>>> What are the dependencies that this split breaks?
>>>>>
>>>>> What are the dependencies MPL.Core?
>>>>
>>>> MPL.Core headers only depend on Config, Preprocessor and Core. MPL adds
>>>> TypeTraits, Predef, StaticAssert and Utility.
>>>
>>> Actually, the dependency of MPL.Core on Core is only through the testing
>>> code and thus can be removed if I move the code to the tests subdirectory.
>>> I can do that tonight. MPL will still depend on Core on its own though.
>>
>> Done.
>
> So, could someone merge the pull request, please?

Done.


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Re: [EXTERNAL] Re: [mpl] Modularization pull request

Andrey Semashev-2
On Wednesday 10 September 2014 20:37:23 Belcourt, Kenneth wrote:
> On Sep 10, 2014, at 2:12 PM, Andrey Semashev <[hidden email]>
wrote:
> >
> > So, could someone merge the pull request, please?
>
> Done.

Thanks.


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Re: [mpl] Modularization pull request

Vicente Botet
In reply to this post by Andrey Semashev-2
Le 04/09/14 04:52, Andrey Semashev a écrit :

> On Wednesday 03 September 2014 23:39:47 Vicente J. Botet Escriba wrote:
>> Le 03/09/14 21:43, Andrey Semashev a écrit :
>>> On Wednesday 03 September 2014 20:04:08 Vicente J. Botet Escriba wrote:
>>>> Le 03/09/14 19:50, Andrey Semashev a écrit :
>>>>> On Sunday 31 August 2014 15:17:56 you wrote:
>>>>>> Hi,
>>>>>>
>>>>>> I've created this pull request:
>>>>>>
>>>>>> https://github.com/boostorg/mpl/pull/11
>> What are the dependencies that this split breaks?
>>
>> What are the dependencies MPL.Core?
> MPL.Core headers only depend on Config, Preprocessor and Core. MPL adds
> TypeTraits, Predef, StaticAssert and Utility.
>
>
>
I don't see any dependencies broken after this split. What am I missing?

Vicente

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Re: [EXTERNAL] Re: [mpl] Modularization pull request

Belcourt, Kenneth

On Sep 16, 2014, at 2:41 PM, Vicente J. Botet Escriba <[hidden email]> wrote:

> Le 04/09/14 04:52, Andrey Semashev a écrit :
>> On Wednesday 03 September 2014 23:39:47 Vicente J. Botet Escriba wrote:
>>> Le 03/09/14 21:43, Andrey Semashev a écrit :
>>>> On Wednesday 03 September 2014 20:04:08 Vicente J. Botet Escriba wrote:
>>>>> Le 03/09/14 19:50, Andrey Semashev a écrit :
>>>>>> On Sunday 31 August 2014 15:17:56 you wrote:
>>>>>>> Hi,
>>>>>>>
>>>>>>> I've created this pull request:
>>>>>>>
>>>>>>> https://github.com/boostorg/mpl/pull/11
>>> What are the dependencies that this split breaks?
>>>
>>> What are the dependencies MPL.Core?
>> MPL.Core headers only depend on Config, Preprocessor and Core. MPL adds
>> TypeTraits, Predef, StaticAssert and Utility.
> I don't see any dependencies broken after this split. What am I missing?

Most / all the develop testers broke following this commit.  The testers that aren’t broken are using a previous install of the headers, if the testers delete the boost directory before running the tests, they too would fail.



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Re: [mpl] Modularization pull request

Andrey Semashev-2
In reply to this post by Vicente Botet
On Wed, Sep 17, 2014 at 12:41 AM, Vicente J. Botet Escriba
<[hidden email]> wrote:

> Le 04/09/14 04:52, Andrey Semashev a écrit :
>
>> On Wednesday 03 September 2014 23:39:47 Vicente J. Botet Escriba wrote:
>>>
>>> Le 03/09/14 21:43, Andrey Semashev a écrit :
>>>>
>>>> On Wednesday 03 September 2014 20:04:08 Vicente J. Botet Escriba wrote:
>>>>>
>>>>> Le 03/09/14 19:50, Andrey Semashev a écrit :
>>>>>>
>>>>>> On Sunday 31 August 2014 15:17:56 you wrote:
>>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> I've created this pull request:
>>>>>>>
>>>>>>> https://github.com/boostorg/mpl/pull/11
>>>
>>> What are the dependencies that this split breaks?
>>>
>>> What are the dependencies MPL.Core?
>>
>> MPL.Core headers only depend on Config, Preprocessor and Core. MPL adds
>> TypeTraits, Predef, StaticAssert and Utility.
>>
>>
>>
> I don't see any dependencies broken after this split. What am I missing?

http://thread.gmane.org/gmane.comp.lib.boost.devel/254576

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Re: [mpl] Modularization pull request

Vicente Botet
Le 17/09/14 06:23, Andrey Semashev a écrit :

> On Wed, Sep 17, 2014 at 12:41 AM, Vicente J. Botet Escriba
> <[hidden email]> wrote:
>> Le 04/09/14 04:52, Andrey Semashev a écrit :
>>
>>> On Wednesday 03 September 2014 23:39:47 Vicente J. Botet Escriba wrote:
>>>> Le 03/09/14 21:43, Andrey Semashev a écrit :
>>>>> On Wednesday 03 September 2014 20:04:08 Vicente J. Botet Escriba wrote:
>>>>>> Le 03/09/14 19:50, Andrey Semashev a écrit :
>>>>>>> On Sunday 31 August 2014 15:17:56 you wrote:
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> I've created this pull request:
>>>>>>>>
>>>>>>>> https://github.com/boostorg/mpl/pull/11
>>>> What are the dependencies that this split breaks?
>>>>
>>>> What are the dependencies MPL.Core?
>>> MPL.Core headers only depend on Config, Preprocessor and Core. MPL adds
>>> TypeTraits, Predef, StaticAssert and Utility.
>>>
>>>
>>>
>> I don't see any dependencies broken after this split. What am I missing?
> http://thread.gmane.org/gmane.comp.lib.boost.devel/254576
>
>
What I mean Andrey is that I don't see the dependency cycle that this
MPL split breaks.
Please could you be explicit?

Vicente


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Re: [mpl] Modularization pull request

Andrey Semashev-2
On Wed, Sep 17, 2014 at 10:08 AM, Vicente J. Botet Escriba
<[hidden email]> wrote:

> Le 17/09/14 06:23, Andrey Semashev a écrit :
>
>> On Wed, Sep 17, 2014 at 12:41 AM, Vicente J. Botet Escriba
>> <[hidden email]> wrote:
>>> I don't see any dependencies broken after this split. What am I missing?
>>
>> http://thread.gmane.org/gmane.comp.lib.boost.devel/254576
>>
> What I mean Andrey is that I don't see the dependency cycle that this MPL
> split breaks.
> Please could you be explicit?

After the MPL.Core->MPL dependency is fixed, and TypeTraits is
reorganized (see the other thread), the circular dependency between
MPL and TypeTraits will be removed. This will also reduce transitive
dependencies for libraries that use MPL.Core and TypeTraits.Base.

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Re: [mpl] Modularization pull request

Vicente Botet
Le 17/09/14 08:13, Andrey Semashev a écrit :

> On Wed, Sep 17, 2014 at 10:08 AM, Vicente J. Botet Escriba
> <[hidden email]> wrote:
>> Le 17/09/14 06:23, Andrey Semashev a écrit :
>>
>>> On Wed, Sep 17, 2014 at 12:41 AM, Vicente J. Botet Escriba
>>> <[hidden email]> wrote:
>>>> I don't see any dependencies broken after this split. What am I missing?
>>> http://thread.gmane.org/gmane.comp.lib.boost.devel/254576
>>>
>> What I mean Andrey is that I don't see the dependency cycle that this MPL
>> split breaks.
>> Please could you be explicit?
> After the MPL.Core->MPL dependency is fixed, and TypeTraits is
> reorganized (see the other thread), the circular dependency between
> MPL and TypeTraits will be removed. This will also reduce transitive
> dependencies for libraries that use MPL.Core and TypeTraits.Base.
>
>
Ok, I have not missed nothing. The split could help to break cycles, but
it doesn't yet.

Vicente

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Re: [mpl] Modularization pull request

Peter Dimov-2
Vicente J. Botet Escriba wrote:

> Ok, I have not missed nothing. The split could help to break cycles, but
> it doesn't yet.

Type Traits depends on MPL now only via Typeof (which in turn depends on
Type Traits itself), so once the Type Traits <-> Typeof cycle is broken, the
Type Traits -> MPL dependency will also vanish.


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Re: [mpl] Modularization pull request

Vicente Botet
Le 17/09/14 19:29, Peter Dimov a écrit :
> Vicente J. Botet Escriba wrote:
>
>> Ok, I have not missed nothing. The split could help to break cycles,
>> but it doesn't yet.
>
> Type Traits depends on MPL now only via Typeof

This is wrong


    /mpl/ <http://www.pdimov.com/tmp/report-d53f656/mpl.html>


      |<boost/mpl/and.hpp>|

  * from |<boost/type_traits/is_virtual_base_of.hpp>|


      |<boost/mpl/assert.hpp>|

  * from |<boost/type_traits/common_type.hpp>|
  * from |<boost/type_traits/detail/common_type_imp.hpp>|


      |<boost/mpl/at.hpp>|

  * from |<boost/type_traits/detail/common_type_imp.hpp>|
  * from |<boost/type_traits/floating_point_promotion.hpp>|


      |<boost/mpl/aux_/config/lambda.hpp>|

  * from |<boost/type_traits/detail/template_arity_spec.hpp>|


      |<boost/mpl/aux_/config/overload_resolution.hpp>|

  * from |<boost/type_traits/detail/template_arity_spec.hpp>|


      |<boost/mpl/aux_/lambda_support.hpp>|

  * from |<boost/type_traits/detail/bool_trait_def.hpp>|
  * from |<boost/type_traits/detail/size_t_trait_def.hpp>|
  * from |<boost/type_traits/detail/type_trait_def.hpp>|


      |<boost/mpl/aux_/preprocessor/params.hpp>|

  * from |<boost/type_traits/detail/template_arity_spec.hpp>|


      |<boost/mpl/aux_/template_arity_fwd.hpp>|

  * from |<boost/type_traits/detail/template_arity_spec.hpp>|


      |<boost/mpl/begin_end.hpp>|

  * from |<boost/type_traits/detail/common_type_imp.hpp>|


      |<boost/mpl/bool.hpp>|

  * from |<boost/type_traits/common_type.hpp>|
  * from |<boost/type_traits/detail/bool_trait_def.hpp>|
  * from |<boost/type_traits/integral_constant.hpp>|


      |<boost/mpl/contains.hpp>|

  * from |<boost/type_traits/detail/common_type_imp.hpp>|


      |<boost/mpl/copy.hpp>|

  * from |<boost/type_traits/detail/common_type_imp.hpp>|


      |<boost/mpl/deref.hpp>|

  * from |<boost/type_traits/detail/common_type_imp.hpp>|


      |<boost/mpl/eval_if.hpp>|

  * from |<boost/aligned_storage.hpp>|
  * from |<boost/type_traits/decay.hpp>|
  * from |<boost/type_traits/detail/common_type_imp.hpp>|
  * from |<boost/type_traits/integral_promotion.hpp>|


      |<boost/mpl/identity.hpp>|

  * from |<boost/aligned_storage.hpp>|
  * from |<boost/type_traits/decay.hpp>|
  * from |<boost/type_traits/integral_promotion.hpp>|


      |<boost/mpl/if.hpp>|

  * from |<boost/type_traits/common_type.hpp>|
  * from |<boost/type_traits/conditional.hpp>|
  * from |<boost/type_traits/detail/common_type_imp.hpp>|
  * from |<boost/type_traits/make_signed.hpp>|
  * from |<boost/type_traits/make_unsigned.hpp>|
  * from |<boost/type_traits/type_with_alignment.hpp>|


      |<boost/mpl/inserter.hpp>|

  * from |<boost/type_traits/detail/common_type_imp.hpp>|


      |<boost/mpl/int.hpp>|

  * from |<boost/type_traits/detail/template_arity_spec.hpp>|
  * from |<boost/type_traits/floating_point_promotion.hpp>|


      |<boost/mpl/integral_c.hpp>|

  * from |<boost/type_traits/integral_constant.hpp>|


      |<boost/mpl/multiplies.hpp>|

  * from |<boost/type_traits/floating_point_promotion.hpp>|


      |<boost/mpl/next.hpp>|

  * from |<boost/type_traits/detail/common_type_imp.hpp>|


      |<boost/mpl/not.hpp>|

  * from |<boost/type_traits/is_virtual_base_of.hpp>|


      |<boost/mpl/or.hpp>|

  * from |<boost/type_traits/detail/common_type_imp.hpp>|


      |<boost/mpl/placeholders.hpp>|

  * from |<boost/type_traits/detail/common_type_imp.hpp>|


      |<boost/mpl/plus.hpp>|

  * from |<boost/type_traits/floating_point_promotion.hpp>|


      |<boost/mpl/push_back.hpp>|

  * from |<boost/type_traits/detail/common_type_imp.hpp>|


      |<boost/mpl/size.hpp>|

  * from |<boost/type_traits/detail/common_type_imp.hpp>|


      |<boost/mpl/size_t.hpp>|

  * from |<boost/type_traits/detail/size_t_trait_def.hpp>|


      |<boost/mpl/vector.hpp>|

  * from |<boost/type_traits/floating_point_promotion.hpp>|


      |<boost/mpl/vector/vector0.hpp>|

  * from |<boost/type_traits/detail/common_type_imp.hpp>|


      |<boost/mpl/vector/vector10.hpp>|

  * from |<boost/type_traits/detail/common_type_imp.hpp>|


> (which in turn depends on Type Traits itself), so once the Type Traits
> <-> Typeof cycle is broken, the Type Traits -> MPL dependency will
> also vanish.
>
I agree that independent of MPL there is a cycle, Type Traits <->
Typeof. So let me repeat what I said in another post.

Let everything in place except type_traits.hpp
type_traits/common_type.hpp, which are move to two sub-modules
TypeTraits.All and TypeTraits.CommonType with the following dependencies

TypeTraits.All -> TypeTraits TypeTraits.CommonType
TypeTraits.CommonType -> TypeTraits TypeOf
TypeOf -> TypeTraits

Note again that this has nothing to be with the Type Traits <->MPL cycle.

Best,
Vicente

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