Joel Falcou wrote:

Daniel Oberhoff a écrit :

...

Hi,

I am stilly trying o get my array computation DSEL up and running. The basic grammar is in place, what I am fighting with is protfying my literals. I.e. I have an array class, and I want the following expression:

A(_i,_j)

to become a function(literal<Array>(A), index_placeholder<0>, index_placeholder<1>) Why A should be a litteral and not terminal ?

I might have gotten the terms wrong. But the way I got it working now is with using proto::lit which turns things into literals. I tried subclassing terminal with my array class, but that way the tree did not keep a reference to the array, and thus could not be evaluated as such. Subclassing literal did not work because I did not find a way to actually have the literal take a reference to the array itself. I could of course use a placeholder syntax, and pass in the actual arrays at evaluation time but I want expressions to work "in-place", i.e. I want to be able to write A(_i,_j) = B(_i) * C(_j); and that to just be evaluated as it stands there. Enabling placeholders could be a useful feature, but that would be relatively easy to add. -- --- Daniel Oberhoff Fraunhofer FIT Schloss Birlinghoven 53754 Sankt Augustin, Germany Tel.: +49-(0)-2241-14-3486 Fax.:+49 (0) 2241/14-2080