Resolution
module Foo
x = "I am in Foo"
macro resulation()
:(x)
end
end
julia> Foo.@resulation()
"I am in Foo"
julia> macroexpand(:( Foo.@resulation() ))
:(Foo.x)
x = "current"
module Foo
x = 100
macro resulation()
esc(:(x))
end
res = @resulation()
end
julia> x = "current"
"current"
julia> Foo.res
100
julia> Foo.@resulation()
"current"
macroexpand(:( Foo.@resulation() ))
:x
So a variable in macro, if it is not in esc, it will be resolved in where it is defined.
If it is in esc, it will be resolved where it is called.
Resolution for arguments
You can resolve an argument by $(esc(exp))
eg:
module Foo
x = 100
macro foo(exp)
:($(esc(exp)))
end
end
Foo.@foo( x )
"current"
and you can do this by esc(:($(exp))) too.
module Foo
x = 100
macro foo(exp)
esc(:($(exp)))
end
end
julia> Foo.@foo( x )
"current"