On Sun, Mar 27, 2011 at 11:35 AM, Thomas Heller <thom.heller@googlemail.com> wrote:
On Sunday, March 27, 2011 05:43:39 PM Lorenzo Caminiti wrote:
On Sun, Mar 27, 2011 at 10:07 AM, Thomas Heller <thom.heller@googlemail.com> wrote:
The guy who wrote the code could have said: const int factor = 10; assignment would then be impossible^W not allowed.
Yes, but the use case would be to have factor const *only* within the "function" passed to for_each while keeping it mutable in the enclosing scope. Therefore, programmers have to declare factor not-const within main() and I was wondering if there was a way using Phoenix to add the const only locally within the "function" passed to for_each (this is done by Boost.Loccal using "constant-binding" as in `const bind& factor`).
Oh right, you can do that ...:
let(_a = ref(factor))[...]; // <-- bind as non-const reference let(_a = cref(factor))[...]; // <-- bind as const reference
Yes, I think that is what I was looking for. I will add it to the Boost.Phoenix example. BTW, can I do the same with Boost.Lambda? Thanks, -- Lorenzo