Optional macro invocation

General Usage
2

Does this help ?

macro maybeasync(asyncflag, expr)
    quote
        if $(esc(asyncflag))
            @async $(esc(expr))
        else
            $(esc(expr))
        end
    end
end

function docos(flag)
     @maybeasync flag cos(1)
end

julia> docos(true)
Task (done) @0x00007f49b7e4a4a0

julia> docos(false)
0.5403023058681398

EDIT: There’s probably a cheaper way to do it, in terms of code generation.

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