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
```