boost - Tagged unions (aka variant) in C++ with the same type multiple times -

i need create union, 2 members of union have same type, need way identify them. example in ocaml :

type =    | b of int   | c of float   | d of float

boost.variant doesn't seem support case, there known library supports ?

if want this, think best option wrap same-but-different-types struct lets boost variant visit proper one:

struct speed {     float val_; };  struct darkness {     float val_; };

you might able use boost_strong_typedef automatically i'm not sure it's guaranteed generate types legal use in union (although fine in variant).

Live