[dune-functions] [Dune-functions-commit] [Commit] dune-functions - 0d929aa: Add staticForLoop

[Carsten Gräser]

Am 23.09.2015 um 14:28 schrieb Steffen Müthing:
> 
>> Am 23.09.2015 um 14:23 schrieb Christian Engwer <christian.engwer at uni-muenster.de>:
>>
>> typetree for the time being:-)
> 
> And we all wait for C++17 and fold expressions… ;-)
But even without generic lambdas this is a major improvement:

Having ForLoop<T,begin,end> looping over begin...end
end not begin...(end-1) comes really surprising. And
may lead to really ugly errors.

Carsten

> 
>>
>> On Wed, Sep 23, 2015 at 02:05:07PM +0200, Carsten Gräser wrote:
>>> New commit, appeared at Wed Sep 23 14:05:07 2015 +0200
>>> as part of the following ref changes:
>>>
>>>    branch refs/heads/master    updated from 9137cfb -> c682840
>>>
>>> Browsable version: http://cgit.dune-project.org/repositories/dune-functions/commit/?id=0d929aa3cbc49d5d6c50d3c478457ac66d7ae255
>>>
>>> ======================================================================
>>>
>>> commit 0d929aa3cbc49d5d6c50d3c478457ac66d7ae255
>>> Author: Carsten Gräser <graeser at mi.fu-berlin.de>
>>> Date:   Wed Sep 23 13:56:53 2015 +0200
>>>
>>>    Add staticForLoop
>>>
>>>    In contrast to the one from dune-common this does not include
>>>    the end and can be used with generic lambdas making code much
>>>    more readable. Maybe we'd like to have this in dune-common or
>>>    dune-typetree.
>>>
>>> dune/functions/common/CMakeLists.txt   |  1 +
>>> dune/functions/common/staticforloop.hh | 57 ++++++++++++++++++++++++++++++++++
>>> 2 files changed, 58 insertions(+)
>>> create mode 100644 dune/functions/common/staticforloop.hh
>>>
>>>
>>>
>>> diff --git a/dune/functions/common/CMakeLists.txt b/dune/functions/common/CMakeLists.txt
>>> index a3ee6f6..e321baf 100644
>>> --- a/dune/functions/common/CMakeLists.txt
>>> +++ b/dune/functions/common/CMakeLists.txt
>>> @@ -15,6 +15,7 @@ install(FILES
>>>         optional.hh
>>>         polymorphicsmallobject.hh
>>>         signature.hh
>>> +        staticforloop.hh
>>>         treedata.hh
>>>         type_traits.hh
>>>         typeerasure.hh
>>> diff --git a/dune/functions/common/staticforloop.hh b/dune/functions/common/staticforloop.hh
>>> new file mode 100644
>>> index 0000000..17ecc51
>>> --- /dev/null
>>> +++ b/dune/functions/common/staticforloop.hh
>>> @@ -0,0 +1,57 @@
>>> +// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
>>> +// vi: set et ts=4 sw=2 sts=2:
>>> +#ifndef DUNE_FUNCTIONS_COMMON_STATICFORLOOP_HH
>>> +#define DUNE_FUNCTIONS_COMMON_STATICFORLOOP_HH
>>> +
>>> +
>>> +#include <dune/functions/common/concept.hh>
>>> +#include <dune/functions/common/type_traits.hh>
>>> +#include <dune/functions/functionspacebases/concepts.hh>
>>> +
>>> +
>>> +namespace Dune {
>>> +namespace Functions {
>>> +
>>> +
>>> +
>>> +template<class ST, ST begin, ST end>
>>> +struct StaticForLoop
>>> +{
>>> +  template<class F, class...Args>
>>> +  static void apply(F&& f, Args&&... args)
>>> +  {
>>> +    f(std::integral_constant<ST, begin>(), std::forward<Args>(args)...);
>>> +    StaticForLoop<ST, begin+1, end>::apply(std::forward<F>(f), std::forward<Args>(args)...);
>>> +  }
>>> +};
>>> +
>>> +template<class ST, ST end>
>>> +struct StaticForLoop<ST, end, end>
>>> +{
>>> +  template<class F, class...Args>
>>> +  static void apply(F&& f, Args&&...)
>>> +  {}
>>> +};
>>> +
>>> +/**
>>> + * \brief Static for loop
>>> + *
>>> + * Run static for-loop from 'begin' to 'end-1' with functor.
>>> + * The functor is called with TypeTree::index_constant<i>
>>> + * as first argument. All other arguments of this method
>>> + * are forwarded to the functor.
>>> + */
>>> +template<std::size_t begin_t, std::size_t end_t, class F, class... Args>
>>> +void staticForLoop(F&& f, Args&&... args)
>>> +{
>>> +  StaticForLoop<std::size_t, begin_t, end_t>::apply(std::forward<F>(f), std::forward<Args>(args)...);
>>> +}
>>> +
>>> +
>>> +
>>> +} // namespace Dune::Functions
>>> +} // namespace Dune
>>> +
>>> +
>>> +
>>> +#endif //DUNE_FUNCTIONS_COMMON_STATICFORLOOP_HH
>>>
>>> _______________________________________________
>>> Dune-functions-commit mailing list
>>> Dune-functions-commit at dune-project.org
>>> http://lists.dune-project.org/mailman/listinfo/dune-functions-commit
>>
>> --
>> Prof. Dr. Christian Engwer
>> Institut für Numerische und Angewandte Mathematik
>> Fachbereich Mathematik und Informatik der Universität Münster
>> Einsteinstrasse 62
>> 48149 Münster
>>
>> E-Mail  christian.engwer at uni-muenster.de
>> Telefon +49 251 83-35067
>> FAX     +49 251 83-32729

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