Re: [Boost-users] behavior conditional on template argument

You can use enable_if to let the compiler decide which one it should instantiate. And the argument will be a custom defined type trait. I think there are facilities to automatically define it on the presence of a type, there may be soemthing for fucntions as well, but I don't remember where they live (MPL ?)

Here it is: http://www.nabble.com/compile-time-check-that-a-member-function-exists-td185...