ERROR: LoadError: syntax: local variable MyType cannot be used in closure declaration

Hi, I am trying to pass a type as an argument to a function, which create other functions, using this type (to avoid type instability). But I get this error:

ERROR: LoadError: syntax: local variable NodeType cannot be used in closure declaration

If the type need only one function, then you can use

function (v::MyType)(a::MyType, b::MyType)
    ...
end

https://github.com/FluxML/Flux.jl/blob/df468ba0a10d86b660eebed98d1b484cbce113a7/src/layers/basic.jl#L170

If the type need two or more functions, define a new method with the type on the first argument. e.g. https://github.com/JuliaStats/Distributions.jl/blob/b2d765246e0f35473fe354dc578a3f7edf11958d/src/univariate/continuous/uniform.jl#L74

If the type need only one function, then you can use

function (v::MyType)(a::MyType, b::MyType)
    ...
end

https://github.com/FluxML/Flux.jl/blob/df468ba0a10d86b660eebed98d1b484cbce113a7/src/layers/basic.jl#L170

If the type need two or more functions, define a new method with the type on the first argument like Base.parse.

In reply to @qwjyh:matrix.org
If the type need only one function, then you can use
function (v::MyType)(a::MyType, b::MyType)
...
end
https://github.com/FluxML/Flux.jl/blob/df468ba0a10d86b660eebed98d1b484cbce113a7/src/layers/basic.jl#L170
If the type need two or more functions, it is common to define a new method with the type on the first argument like Base.parse.

ERROR: LoadError: syntax: Global method definition around test.jl:2 needs to be placed at the top level, or use "eval".

When I try like that :

function create_function(MyType)
	function (test::MyType)(a::MyType, b::MyType)
		return a+b
	end
	return test
end

Ok I found how to do that, it should be :

function create_function(MyType, value)
	function test(a::MyType, b::MyType) where MyType
		return a+b
	end
	return test
end

But I admit I don’t really understand why.

Ok I found how to do that, it should be :

function create_function(MyType)
	function test(a::MyType, b::MyType) where MyType
		return a+b
	end
	return test
end

But I admit I don’t really understand why.

In reply to @qwjyh:matrix.org
Do you want to generate a function based on a type automatically? If normal multiple dispatch doesn't meet your need, you should use macro.

In reply to @qwjyh:matrix.org
Simple example for the syntax:
```
julia> struct MyType
v::Int64
end

julia> function (t::MyType)(a::T, b::T) where {T <: Integer}
a + b + t.v
end

julia> x = MyType(1)
MyType(1)

julia> x(1, 2)
4
```

My problem is that the function is in a closure, and it gives me the error :

ERROR: LoadError: syntax: local variable MyType cannot be used in closure declaration

In reply to @qwjyh:matrix.org
Simple example for the syntax:
```
julia> struct MyType
v::Int64
end

julia> function (t::MyType)(a::T, b::T) where {T <: Integer}
a + b + t.v
end

julia> x = MyType(1)
MyType(1)

julia> x(1, 2)
4
```

In reply to @qwjyh:matrix.org
Simple example for the syntax:
```
julia> struct MyType
v::Int64
end

julia> function (t::MyType)(a::T, b::T) where {T <: Integer}
a + b + t.v
end

julia> x = MyType(1)
MyType(1)

julia> x(1, 2)
4
```