It's a lot like unpacking a type, except instead of defining new variables for the unpacked values, your macro places the type instance designation (t. ...).
On Sunday, October 9, 2016 at 10:55:45 AM UTC-7, Tom Breloff wrote: > > What about it? I don't think there's anything like this in Parameters. > > On Sun, Oct 9, 2016 at 1:27 PM, Chris Rackauckas <rack...@gmail.com > <javascript:>> wrote: > >> What about Parameters.jl <https://github.com/mauro3/Parameters.jl>? >> >> >> On Wednesday, September 7, 2016 at 7:23:47 AM UTC-7, Tom Breloff wrote: >>> >>> Hey all... I just threw together a quick macro to save some typing when >>> working with the fields of an object. Disclaimer: this should not be used >>> in library code, or in anything that will stick around longer than a REPL >>> session. Hopefully it's self explanatory with this example. Is there a >>> good home for this? Does anyone want to use it? >>> >>> julia> type T; a; b; end; t = T(0,0) >>> T(0,0) >>> >>> julia> macroexpand(:( >>> @with t::T begin >>> a = 1 >>> b = 2 >>> c = a + b - 4 >>> d = c - b >>> a = d / c >>> end >>> )) >>> quote # REPL[3], line 3: >>> t.a = 1 # REPL[3], line 4: >>> t.b = 2 # REPL[3], line 5: >>> c = (t.a + t.b) - 4 # REPL[3], line 6: >>> d = c - t.b # REPL[3], line 7: >>> t.a = d / c >>> end >>> >>> julia> @with t::T begin >>> a = 1 >>> b = 2 >>> c = a + b - 4 >>> d = c - b >>> a = d / c >>> end >>> 3.0 >>> >>> julia> t >>> T(3.0,2) >>> >>> >
