我想知道是否有一种方法可以使用符号进行多次调度,还包括“全能方法”。即
之类的东西function dispatchtest{alg<:Symbol}(T::Type{Val{alg}})
println("This is the generic dispatch. The algorithm is $alg")
end
function dispatchtest(T::Type{Val{:Euler}})
println("This is for the Euler algorithm!")
end
第二个工作并匹配手册中的内容,我只是想知道你是如何让第一个工作的。
答案 0 :(得分:7)
你可以这样做:
julia> function dispatchtest{alg}(::Type{Val{alg}})
println("This is the generic dispatch. The algorithm is $alg")
end
dispatchtest (generic function with 1 method)
julia> dispatchtest(alg::Symbol) = dispatchtest(Val{alg})
dispatchtest (generic function with 2 methods)
julia> function dispatchtest(::Type{Val{:Euler}})
println("This is for the Euler algorithm!")
end
dispatchtest (generic function with 3 methods)
julia> dispatchtest(:Foo)
This is the generic dispatch. The algorithm is Foo
julia> dispatchtest(:Euler)
This is for the Euler algorithm!