metaprogramming - Julia: Building symbol expressions -



metaprogramming - Julia: Building symbol expressions -

i have repetitive set of boilerplate code looks this:

type object ptr::ptr{void} function object() ptr = ccall( (:createobject, lib_smile), ptr{void}, ()) smart_p = new(ptr) finalizer(smart_p, obj -> ccall( (:freeobject, lib_smile), void, (ptr{void},), obj.ptr )) smart_p end end

i auto-generate set of these type definitions:

for str = ("obj1","obj2","obj3") op_fname = symbol(str) op_create = ??? op_free = ??? @eval begin type $op_fname ptr::ptr{void} function ($fname)() ptr = ccall( ($op_create, lib_smile), ptr{void}, ()) smart_p = new(ptr) finalizer(smart_p, obj -> ccall( ($op_free, lib_smile), void, (ptr{void},), obj.ptr )) smart_p end end end end

i have not figured out how generate right "symbol symbols" op_create , op_free. in, need op_create = :(:createobj) cannot replicate this. there way generate needed symbol in context?

thank you.

update: original reply works (see below), @mlubin points out, quotenode internal implementation function. quot function in base.meta better:

import base.meta.quot str = "obj1" quot(symbol("create$str"))

returns :(:createobj1). don't think meta.quot documented either.

original answer: you're looking quotenode:

str = "obj1" quotenode(symbol("create$str"))

returns :(:createobj1) seems clear application macro!

metaprogramming julia-lang

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