[ITK] [ITK-dev] Kents Work on Explicit instantiation of ITK

[Matt McCormick]

Hi,

Instead of maintaining a duplicate set of type instantiations, it may
be worth exploiting the ITK_WRAP_EXPLICIT option (see
Wrapping/Generators/Explicit).  This will re-use all the wrapping type
instantiation logic, which is also CMake configurable.

2 cents,
Matt



On Tue, Mar 17, 2015 at 10:44 AM, Bradley Lowekamp
<blowekamp at mail.nih.gov> wrote:
> Hans,
>
> Thanks for sharing this work.
>
> I was able to utilize your script and methodology for SimpleITK to
> explicitly instantiate about 16 classes with their commonly used arguments
> as by SimpleITK [1]. I created a separate library in SimpleITK which
> contains these explicitly instantiated classes [2].
>
> These instantiations reduced the size of the .o files for SimpleITK by ~30%
> (500MB), and enabled linking once again on Windows 64. Some systems seem to
> also gain significant performance in build time (over 2X), but there are
> many reasons for it including running into memory or IO limitations on the
> individual system.
>
> However I was not able to get it working with the explicitly instantiated
> library as shared. The mixtures of export specification of the initial ITK
> declaration and the explicit instantiation linking specification didn't
> appear to work. I think they need to be consistent? I followed the
> methodology that was done for the MetaDataObjects[3]. If I build ITK and
> SimpleITK as shared but with the Explicit library as static it appears to
> work.
>
> Any help on explicitly instantiation with shared libraries would be
> appreciated!
>
> Thanks,
> Brad
>
> [1]
> https://github.com/SimpleITK/SimpleITK/blob/a6e62785a9e8ebc41dfb3e15f72e1985a620bf22/Code/Explicit/include/sitkExplicitITK.h
> [2]
> https://github.com/SimpleITK/SimpleITK/blob/a6e62785a9e8ebc41dfb3e15f72e1985a620bf22/Code/Explicit/src/CMakeLists.txt
> [3]
> https://github.com/InsightSoftwareConsortium/ITK/blob/d195bfb21e8af086c67208c2b96d5fd5992c66ca/Modules/Core/Common/include/itkMetaDataObject.h#L191-L224
>
> On Jan 28, 2015, at 12:16 PM, Johnson, Hans J <hans-johnson at uiowa.edu>
> wrote:
>
> Yes!  I’d love someone to investigate further:
>
>
> https://github.com/hjmjohnson/ITK/tree/TryExplicitInstantiationTesting
>
> https://github.com/hjmjohnson/ITK/commit/0576c75c8a760f1cafcde3125210134a39502304
>
>
> Hans
>
>
>
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