I wrote a short macro for Julia 0.4 to generate fixed-length tuples using
comprehension-like syntax. This is useful in code where tuples are used to
represent fixed-length arrays. Here is an example:
v = @tuplegen [(i==2)? i * 6 : i for i = 1 : 3]
macro-expands to
v = (1, 2*6, 3)
which would yield (1,12,3). You could get the same result via the standard
code:
v = tuple( [ <comprehension goes here> ] ...)
but this latter code would create a heap-allocated array as a temporary
variable and hence would presumably be less efficient.
The metaprogramming to make this work is similar to the metaprogramming for
my unroll macro, so I put them in the same package. You can get @tuplegen
(and @unroll) via:
Pkg.clone("https://github.com/StephenVavasis/Unroll.jl";)
