Re: [boost] [mpl] bug: has_xxx, default bool parameter

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2004-09-03 11:14:14

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