Re: [boost] [TTI] macro to "box" types for subsequent traits extraction?

7 May 2014


      On Wed, May 7, 2014 at 10:55 AM, Rob Stewart wrote:
...
On May 5, 2014 11:03:01 AM EDT, Rein Halbersma 
wrote:
...
I have a small feature request for the Type Traits Introspection
library: a
macro BOOST_TTI_BOX_TYPE(U) that defines a class template box_type<T>
with
a nested typedef named "type" that equals T::U.
Where does the macro get T?
T would be the template parameter of the class template generated by the
macro

#define BOOST_TTI_BOX_TYPE(U)      \
template<class T>                  \
struct box_type_ ## U              \
{                                  \
    using type = typename T::U;    \
};
...
...
Small self-contained example:
http://coliru.stacked-crooked.com/a/76b9abf4aaf00350
Posting the code facilitates later searching and prevents problems on
finding out later (should the linked site disappear or the linked code be
deleted on the future). It also permits quoting portions in replies.
OK, will do next time.

Rein