[boost] Re: Perfect Forwarding (almost)

Raoul Gough wrote:

struct A { A &as_lvalue () { return *this; } };

void foo (A const &);

void bar () { foo (A()); // #1 Can copy foo (A().as_lvalue()); // #2 Can't copy }

Lately we discovered that there is difference between #1 and #2 since #1 might produce a const object, since in case that additional temporary is introduced it is const, with all the following consequences (e.g. potential const optimizations that no compiler actually do). Rani