p.s. I am aware that unary function template would only add one to your collection overall with meta programming but more than two and three parameter and code starts to get large or maybe I'm just lazy.
On Tuesday, October 6, 2015 at 8:30:00 PM UTC+1, [email protected] wrote: > > Hi Thomas, > > At first I started by taking this kind of approach but what if you want to > lift all the relevant functions in Julia Base? Some are unary, binary, and > then other have multiple parameters and you also have to think about all > the combinations of parameters that you could have. The current approach I > am taking would allow you to lift all the relevant functions in Julia Base > without having to write all the combinations of functions. And as you > rightly pointed out in a previous email, Julia language can change, its > constantly being developed. Therefore I am trying to use a small code set > that does what we it needs to do but has a minimal maintenance requirement. > In the end I would like to do: > > Importall Base > fun_names = names(Base) #[or a relevant selection of this] > > # Small lift code goes here ... > ... > # Then we are done > > > > On Tuesday, October 6, 2015 at 8:32:38 AM UTC+1, Tomas Lycken wrote: >> >> Sorry, do this instead to make sure that the code is type stable: >> >> +{S,T}(x::Nullable{S}, y::Nullable{T}) = isnull(x) || isnull(y) ? >> Nullable{promote_type(S,T)}() : Nullable(x.value + y.value) >> +{S,T}(x::Nullable{S}, y::T) = +(x, Nullable(y)) >> +{S,T}(x::T, y::Nullable{S}) = +(y, x) >> >> // T >> >> On Tuesday, October 6, 2015 at 9:31:15 AM UTC+2, Tomas Lycken wrote: >> >> It seems that you should be able to do this by defining new methods for >>> the operations you need to support. For addition, you could do >>> >>> ``` >>> +{S,T}(x::Nullable{S}, y::Nullable{T}) = isnull(x) || isnull(y) ? >>> Nullable{promote_type(S,T)}() : x.value + y.value >>> +{S,T}(x::Nullable{S}, y::T) = +(x, Nullable(y)) >>> +{S,T}(x::T, y::Nullable{S}) = +(y, x) >>> ``` >>> >>> For other operations, you would do similar things. >>> >>> // T >>> >>> >>> On Tuesday, October 6, 2015 at 4:33:05 AM UTC+2, [email protected] >>> wrote: >>>> >>>> I'd like to be able to do for example: >>>> >>>> Nullable(3.) + 6 = Nullable(9.) >>>> >>>> as well as >>>> >>>> Nullable(3.) + Nullable(6) = Nullable(9) >>>> >>>> All types interacting with Nullables -> Nullable >>>> >>>> >> >
