Jason House wrote:
Would sum!( "i", "a[i]*b[i]" ) be acceptable? That should be achievable with a 
template mixin that does string mixins under the hood.

It is indeed a solution for the problem, but I still don't like it too much. For one, writing expressions as strings always feels awkward. Even though D can handle these strings at compile time, it just doesn't feel like writing native D code.

Beyond this "gut feeling" I also see two technical problems:

* code editors do not recognize the string content as code, so they cannot offer syntax highlighting or more advanced language tools

* the syntax does not allow nesting:

        sum(i)( a[i] * sum(j)(b[i,j]*c[j]) )

Greetings,
Norbert

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