Re: [Boost-users] [foreach] gcc 4.5 & 4.6 compiler error with BOOST_FOREACH(auto&& ...) loop

Michel MORIN wrote:

I think this is a gcc bug. In a function template, auto deduction fails to deduce an lvalue reference when auto&& is initiliazed by a function return value of an lvalue reference.

Minimal test case: (This code fails to be compiled.)

int& identity(int& i) {    return i; }

template // Commenting this out makes compilation succeed void f() {    int i = 0;    auto&& x = identity(i); // In a function template, auto deduction fails }

int main (int argc, char* argv[]) {    f();    return 0; }

This seems an unknown bug of gcc, so I reported this to GCC Bugzilla: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47999 Good thing you found this problem, Nate! Regards, Michel