I'm not an expert, nor do I understand what you're trying to do.
Presumably you've read: http://docs.julialang.org/en/release-0.4/manual/metaprogramming/ I'm also somewhat confused by various ways to create expressions, and their relationship to each other: :(code) quote code end Expr(:quote, :(code)) Note that dump() is sometimes useful. e1 = :(a+1) e2 = quote a+1 end e3 = Expr(:quote, :(a+1)) dump(e1) dump(e2) dump(e3) e2.args[2] == e1 e3.args[1] == e1 $ is interpolation within an expression, so that :($expr) == expr :($e1) == e1 == :(a+1) Finally, if you quote a symbol you'll get a QuoteNode: julia> z = :(:a) :(:a) julia> dump(z) QuoteNode value: Symbol a julia> z.value :a If you quote an expression, you'll get a Quote expression: z = :(:(a+1)) dump(z) z == e3 On Saturday, April 2, 2016 at 11:52:42 AM UTC+11, vis...@stanford.edu wrote: > > x = :(:x) > > $x > > *ERROR: unsupported or misplaced expression $* > > > Is there a quote/unquote function that mimics the behavior or what happens > when you wrap something with :() or do $x? I want to retrieve what's inside > the variable x's expression. > > It's not sufficient to just wrap in Expr(:quote, ...) since that's not the > same as :() and similarly I can't find any documentation on how to unquote > something. > > There must be some routine being called in order to do the > quoting/unquoting - is there a way to access it? > > > Vishesh >
