The interface Matt is prototyping for Tuple{}'s
https://github.com/mbauman/Tuples.jl
could (should?) be expanded for any type-parameters. (Or does it already
work?)On Fri, 2015-09-11 at 21:54, David Gold <[email protected]> wrote: > I'm not convinced it's more Julian to use such a helper function, since it > will needlessly compile a different method for each distinct set of > parameters. Directly accessing the `parameter` field of the type in > question avoids this. > > On Friday, September 11, 2015 at 12:30:16 PM UTC-7, Josh Langsfeld wrote: >> >> You can access the 'parameters' field of a type instance object. But the >> standard Julian way to get type parameters is to just define a helper >> function: >> >> typeparams{A,B}(::Type{T{A,B}}) = A,B >> >> On Friday, September 11, 2015 at 3:20:17 PM UTC-4, Erik Schnetter wrote: >>> >>> Is there a function in Julia that allows accessing the parameters of a >>> type? >>> >>> For example, if I have >>> >>> type T{A,B} end >>> >>> then I'd like a way to convert `T{Int, Char}` to `(Int, Char)`. >>> >>> In other words, is there a way to get at the contents of `DataType` >>> objects? >>> >>> Thanks, >>> -erik >>> >>> -- >>> Erik Schnetter <[email protected]> >>> http://www.perimeterinstitute.ca/personal/eschnetter/ >>> >>
