On Thu, Apr 1, 2010 at 2:11 PM, Steven Watanabe <watanabesj@gmail.com> wrote:
AMDG
Adam Butcher wrote:
Perhaps this would have been better as two separate mails but since it is all lambda related I have included it as one (despite one patch actually being to the result_of library).
<snip> Is there an MPL/type_traits predicate generator for portable nested template detection? I am aware of BOOST_MPL_HAS_XXX_TRAIT_(NAMED_)DEF but I couldn't see any generator around that area that would do nested template detection. We have such a facility in our code base but it will have only been tried on GCC 4 and VC9 (maybe also VC7.1).
As I recall, much of the code here was meant as infrastructure to support general template introspection; i.e. detecting member class templates and function templates in addition to the member types and variables detected by has_xxx. At the time there didn't seem to be much demand, so I set the project aside. If you're only concerned with detecting member class templates, I'm sure there's more straight forward implementations around that don't rely as heavily on preprocessor metaprogramming.
This patch seemed to be missing, so I re-uploaded it. The patch was the result of (no pun intended) some discussion. I found an e-mail with an overview here http://tinyurl.com/2jgtld. To my knowledge, the patch was never applied. It's been a few years, but my recollection is that a rewrite of lambda was anticipated, which would address these issues, and there was little demand for result_of/lambda compatibility in the meantime. Also, there was no active maintainer for the lambda library. ~Daniel