on Thu Apr 30 2009, Mathias Gaunard <mathias.gaunard-AT-ens-lyon.org> wrote:
David Abrahams wrote:
I need a way to detect whether a type "has a move constructor" (without causing a compiler error, of course) in GCC 4.4.
What about creating a type U that inherits from T, does using T::T, and deletes U(const U&). Now you just have to check whether U(make<U>()) is a valid expression using SFINAE for expressions.
Looks promising, but http://gcc.gnu.org/gcc-4.4/cxx0x_status.html indicates there's no constructor inheritance yet, which I believe is required for that using declaration. That's confirmed by my test with g++-4.4 as available from macports. Trying again with macports/gcc-4.5 prerelease, just for fun. -- Dave Abrahams BoostPro Computing http://www.boostpro.com