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Re: [RFC / Patch] C++/26099 or front-end support to type traits

Gabriel Dos Reis wrote:

I was hoping that we would not need to use C++ template syntax.  I was
hoping that the actual syntax should be C compatible

__trait__(T, __has_trivial_constructor__)

where the first argument is a type, and the second could be made an
enumeration (known to the compiler), or just identifiers à la
offsetof, or GNU C attributes; with __trait__ itself a built in
function as apposed to a keyword.


Ok, now I see. Actually I experimented already a bit with __builtin_offsetof. There is a small complication in that we want to keep open the possibility of binary traits, therefore:

__trait__(T, U, __is_base_of__)

I suppose tentative parsing has no problem with that, right?

Paolo.

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