[julia-users] macro to exclude code depending on VERSION

[andrew cooke]

when you're writing code that uses macros, supporting different versions of 
julia seems to be more complex than normal.  in particular, things like:

if VERSION > XX
    # code with macros here
end

don't work as expected, because macro expansion occurs before runtime 
evaluation.  so the macros are expenaded whatever version.

given that, i have found this simple macro to be useful;

macro cond(test, block)
    if eval(test)
        block
    end
end

@cond VERSION >= v"0.4" begin
     # code with macros here
end

anyway, my questions are: (1) is the above sensible and (2) does this 
already exist?

thanks,
andrew