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Ublas : |
Subject: Re: [ublas] [bindings] New traits system
From: Hongyu Miao (jackymiao_at_[hidden])
Date: 2009-11-27 14:36:46
Wonderfull!!! I really like all the differences listed since the previous implementation triggered so many compiling isssues for cross-platform applications.
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Hongyu Miao
2009-11-27
-------------------------------------------------------------
From£ºRutger ter Borg
Date£º2009-11-27 04:12:16
To£ºublas
CC£º
Subject£º[ublas] [bindings] New traits system
Dear all,
Herewith some news surrounding the numeric_bindings. I've rewritten the
traits part from the ground up, with simplicity, flexibility and efficiency
in mind.
Most notable differences:
* Full MPL-compatible support for static matrices and vectors, for all the
compile-time-junkies out there.
* No more separate matrix and vector trait classes, all through one adaptor
* Built-in automatic reinterpretations (matrix->vector, vector->matrix,
scalar->matrix (!), etc.) for all objects
* Proxies and views through meta-adaptors, e.g., row(), column(), trans(),
upper(), lower()
* Compile-time selected iterators (so far, linear data structures only,
triangular and yale sparse to come)
* IO support; pretty printing (will give nice output for all bindable
objects)
* Easier directory structure (std/vector.hpp, ublas/vector.hpp, etc.).
Directory name is the most specific namespace-name of the object, filename
is the lower-cased name of the object.
* Support for C arrays, standard vectors, uBLAS, TNT, eigen2, more to be
added such as glas and mtl4
Some examples of what's possible:
double a[5][10];
std::cout << column( a, 0 ) << std::endl;
std::sort( begin( row( a, 2 ) ), end( row( a, 2 ) ) );
std::cout << result_of::num_rows<double[5][10]>::type::value << std::endl;
for( result_of::begin< T, 1 >::type i = begin< 1 >( t ); i != end< 1 >( t );
++i ) {
}
some bits are still a bit rough, but hopefully you're getting the idea. And,
of course, what drives all this, is the user-friendliness of calls to blas
and lapack. The goal is to be able to do
blas::some_op( trans( a ), row( b, 2 ) );
for any matrix and/or vector object. I would like to push this towards a
first kind of official RFC. I you're interested in the effort of getting a
(the second) stable version of numeric_bindings out of the door, please
don't hestitate to get involved.
Thanks!
Cheers,
Rutger
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