Re: [boost] [IdentityType] Const omission undocumented.

On Sat, Nov 16, 2013 at 11:18 AM, Mathias Gaunard wrote:

On 16/11/2013 01:02, Mostafa wrote:

...

#include #include <utility>

int main() { BOOST_IDENTITY_TYPE(( std::pair const )) x; // This compiles, so the const qualification in the // above macro parameter is ignored. x = std::make_pair(0,1);

return 0; }

The omission of const qualification in BOOST_IDENTITY_TYPE types is undocumented. This omission maybe deduced from the documented implementation, but, as noted, that is not part of the library api and is subject to change. I therefore propose that this behaviour be documented as part of the library's public api.

That looks like a bug.

Is there a way to extract the cv-qualifier from a function parameter type at compile-time? some_mata_function::type // evaluates to `int const` not just `int` Right now I do the following which looses the cv-qualifier (I also tried to program my own meta-functions but I wan't able to retain the cv-qualifier). boost::function_traits::arg1_type // evaluates to `int` and not to `int conat` :( Thanks. --Lorenzo