citibeth
commented
6 years ago See here for how Fortran + Blitz can be used to pass arrays seemlessly between C++ and Fortran:
http://jerseybiker.blogspot.com/2013/10/passing-assumed-shape-arrays-between.html
https://github.com/citibeth/ibmisc/blob/develop/slib/ibmisc/f90blitz_f.py https://github.com/citibeth/ibmisc/blob/develop/slib/ibmisc/f90blitz.hpp
-- Elizabeth
On Sat, Jul 21, 2018 at 3:50 AM, Tobias Loew notifications@github.com wrote:
Hello,
I'm Tobias Loew. Over the last 12 month I've been working a lot with the Blitz++ library. For my Fortran 90 to C++ translation project ( https://github.com/tobias-loew/f2cpp), I use Blitz++ as template-expression library mimicking the Fortran 90 array-operations. For having a proper replacement for Fortran I had to extend Blitz++ with some additional features:
- added TinyBasedVector (and its associated iterator-types), an extension of TinyVector that allows specifying a base index, this is used as base-class for non-dynamic arrays (e.g. static or stack-based)
- added a Policy template argument to the Array class that allows optimizations when used with TinyBasedVector
- added support for indexing-arrays (only one level currently, nesting of index-arrays is not yet supported)
- added support for member-projections (access struct-members as blitz-array from a blitz-array over a struct; categorical-speaking: make struct-member-access a functor)
- added many constexpr contructors
Further on, I disabled the explicit evaluation-optimizations (alignment, SIMD), since the modern C++ compiler usually do those optimizations automatically (and may finally inline everything). My version of Blitz++ compiles on VS 2015 or a comparable Clang/GCC compiler. It uses C++11/14 features as auto, decltype, constexpr, lambdas and variadic templates. IMHO Blitz++ could benefit a lot by switching to a modern C++ standard, since most of the function overload sequences can be replaced by a single variadic-template function. (E.g. this could be used in a Blitz++ 2.0 version.)
All those changes I did not just for "playing around", but are used since almost a year in a quite large code-base (which was translated from Fortran and with my f2cpp-tool). (The program I work on at my company is Ebsilon (www.ebsilon.com). The code is proprietary, but I could show you a C++ version of LAPACK using my Blitz++ library.)
When you're interested in the code, please have a lock at https://github.com/tobias-loew/f2cpp. I would be happy if some of my changes would make it into Blitz++ (2.0 ?).
Tobias
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Hello,
I'm Tobias Loew. Over the last 12 month I've been working a lot with the Blitz++ library. For my Fortran 90 to C++ translation project (https://github.com/tobias-loew/Fortransformers), I use Blitz++ as template-expression library mimicking the Fortran 90 array-operations. For having a proper replacement for Fortran I had to extend Blitz++ with some additional features:
Further on, I disabled the explicit evaluation-optimizations (alignment, SIMD), since the modern C++ compiler usually do those optimizations automatically (and may finally inline everything). My version of Blitz++ compiles on VS 2015 or a comparable Clang/GCC compiler. It uses C++11/14 features as auto, decltype, constexpr, lambdas and variadic templates. IMHO Blitz++ could benefit a lot by switching to a modern C++ standard, since most of the function overload sequences can be replaced by a single variadic-template function. (E.g. this could be used in a Blitz++ 2.0 version.)
All those changes I did not just for "playing around", but are used since almost a year in a quite large code-base (which was translated from Fortran and with my f2cpp-tool). (The program I work on at my company is Ebsilon (www.ebsilon.com). The code is proprietary, but I could show you a C++ version of LAPACK using my Blitz++ library.)
When you're interested in the code, please have a lock at https://github.com/tobias-loew/Fortransformers. I would be happy if some of my changes would make it into Blitz++ (2.0 ?).
Tobias