Macro dlib::external_library

macro_rules! external_library {
    ($structname: ident, $link: expr,
        $(statics: $($sname: ident: $stype: ty),+,)|*
        $(functions: $(fn $fname: ident($($farg: ty),*) -> $fret:ty),+,)|*
        $(varargs: $(fn $vname: ident($($vargs: ty),+) -> $vret: ty),+,)|*
    ) => { ... };
}