Daniel Wallin writes:

The traits generated with BOOST_MPL_HAS_XXX_TRAIT_DEF() doesn't work with lambda on VC7.1+. I think the problem is the default bool parameter:

template< typename T, bool fallback_ = default_ > struct trait \ ^^^^^^^^^^^^^^^^^^^^^^^^^

This template will never match:

template<template<typename ..> class F, class U1 .. UN> struct lambda<F<U1 .. UN> >;

So lambda breaks. I guess the solution is to stop using a default bool parameter and use a class type instead.

Daniel, Thanks for the report. Fixed in the CVS. -- Aleksey Gurtovoy MetaCommunications Engineering