How to delete method for call functions?

General Usage
1

Lets define call syntax for Int

(i::Int)(n::Number) = i*n
3(4)  # 12

now I can list the methods by using Int.name.mt which will output

# 1 method for generic function "(::Int64)":
[1] (i::Int64)(n::Number) in Main at none:1

The goal is to delete this again, however I fail trying so. Best guess is just calling empty!() on it, but that is not defined… Next guess is using Base.delete_method, however that does not work either…

Base.delete_method(collect(Base.MethodList(Int.name.mt))[1])
3(4)  # 12

Does anyone know how I can empty the methodtable of a Type, i.e. getting Int.name.mt empty again?

2

another try… also failing

for m ∈ methods(1)
  Base.delete_method(m)
end
3(4)  # 12
3

delete_method works fine:

julia> sin("asd")
ERROR: MethodError: no method matching sin(::String)
Closest candidates are:
  sin(::BigFloat) at mpfr.jl:683
  sin(::Missing) at math.jl:1056
  sin(::Complex{Float16}) at math.jl:1005
  ...
Stacktrace:
 [1] top-level scope at none:0

julia> Base.sin(::String) = "ha"

julia> sin("asd")
"ha"

julia> Base.delete_method(which(sin, (String,)))

julia> sin("asd")
ERROR: MethodError: no method matching sin(::String)
Closest candidates are:
  sin(::BigFloat) at mpfr.jl:683
  sin(::Missing) at math.jl:1056
  sin(::Complex{Float16}) at math.jl:1005
  ...
Stacktrace:
 [1] top-level scope at none:0

What you’re seeing is normal behaviour – a number (e.g. 3) juxtaposed with an expression (e.g. (4)) is defined as multiplication. Your overload didn’t actually take effect at all:

julia> (i::Int)(n::Number) = i+n

julia> 3(4)
12 # should be 7 if the method above was called
4 Likes
4

what a coincidence :'D

thanks for pointing that out!

an adapted example indeed works. Thanks a lot!

julia> "hi"("ho")
ERROR: MethodError: objects of type String are not callable
Stacktrace:
 [1] top-level scope at none:0

julia> (i::String)(n::String) = i * n

julia> "hi"("ho")
"hiho"

julia> for m ∈ Base.MethodList(String.name.mt)
       Base.delete_method(m)
       end

julia> "hi"("ho")
ERROR: MethodError: objects of type String are not callable
Stacktrace:
 [1] top-level scope at none:0