Note that this can be made to work by tearing a page from Base: we can a
module (SuperSecretBase), that defines a stub value() function. We then use
importall SuperSecretBase in each of Foo and Bar. But this means that
any module we create would need to declare its functions into
SuperSecretBase.
julia> workspace() ; include("mike.jl")
julia> using Foo
julia> using Bar
julia> value(Bar.BarType())
"Bar::value"
julia> value(Foo.FooType())
"Foo::value"
julia>
Modified code follows:
module SuperSecretBase
value() = nothing
export value
end
# ------------------------------
module Foo
importall SuperSecretBase
importall Base
type FooType end
value(x::FooType) = "Foo::value"
get(x::FooType) = "Foo::get"
export value
end
# ------------------------------
module Bar
importall SuperSecretBase
importall Base
type BarType end
value(x::BarType) = "Bar::value"
get(x::BarType) = "Bar::get"
export value
end
On Tuesday, April 21, 2015 at 9:26:01 AM UTC-4, Michael Turok wrote:
>
> Hi,
>
> What is the idiomatic way to create a function value() in different
> modules, dispatched on different arguments, without getting the
> warning/error about conflicting with an existing identifier?
>
> It seems like there is an order dependency with the example below. Seems
> like the 2nd module defines value(), unless you had already used value()
> prior to importing the 2nd module.
>
> Note that if I do the same with get() a function defined in Base, I don't
> get an error.
>
> Code and output from julia REPL below.
>
> Any help appreciated,
> Michael
>
> # this is mike.jl
>
> # ------------------------------
> module Foo
> # ------------------------------
> importall Base
> type FooType end
>
> value(x::FooType) = "Foo::value"
> get(x::FooType) = "Foo::get"
>
> export value
>
> end
>
> # ------------------------------
> module Bar
> # ------------------------------
> importall Base
>
> type BarType end
>
> value(x::BarType) = "Bar::value"
> get(x::BarType) = "Bar::get"
>
> export value
>
> end
>
> Using this in the REPL:
> julia> workspace() ; include("mike.jl")
>
> julia> using Foo
>
> julia> value(Foo.FooType())
> "Foo::value"
>
> julia> using Bar
> Warning: using Bar.value in module Main conflicts with an existing
> identifier.
>
> julia> value(Bar.BarType())
> ERROR: `value` has no method matching value(::BarType)
>
> # -----------------------------------------------------
>
> julia> workspace() ; include("mike.jl")
>
> julia> using Foo
>
> julia> using Bar
>
> julia> value(Foo.FooType())
> ERROR: `value` has no method matching value(::FooType)
>
> julia> value(Bar.BarType())
> "Bar::value"
>
> # -----------------------------------------------------
>
> julia> workspace() ; include("mike.jl")
>
> julia> using Bar
>
> julia> using Foo
>
> julia> value(Foo.FooType())
> "Foo::value"
>
> julia> value(Bar.BarType())
> ERROR: `value` has no method matching value(::BarType)
>
> julia>
>
