Re: [C++03] Temporaries passed to constructor yield invalid member references

Hello. I am trying to write a class similar to this:
template<class StringT>
struct A
{
   A (StringT const&str) : str(str) { }
   StringT const&str;
};
The problem is that the constructor allows passing temporaries, which
get destroyed as soon as the constructor finishes executing, not after
the object is destroyed.
(....)
Discussing with some other people, we have come up with several
solutions, none of which fully satisfy me:
1) Make the constructor take a non-const ref as opposed to a const
ref. (Why not: breaks const correctness)
2) Add an additional level of indirection: (Why not: likely overhead)
struct A
{
   boost::any str;
   A () : str() {}
   template<class StringT> void set_str(StringT const&s) { str = s; }
};
3) Make the constructor take a StringT as opposed to a reference (Why
not: overhead and additional memory)

Please let me know if you have any better solutions to my problem.
Note that compatibility with C++03 is a must here, and performance is
kind of important.