Hello.
I'm trying to use a pair<> to pass values inside a fold<> :
template<typename Seq>
struct remove_duplicates // even if not consecutive; also keep order
{
typedef typename mpl::second<
mpl::fold<
Seq,
mpl::pair< mpl::set<>, mpl::vector<> >,
typedef typename mpl::if_<
mpl::has_key
type; };
It looks like first<> and second<> don't work on placeholders. My compiler - Visual Studio 2008 - complains that "'first' : is not a member of 'boost::mpl::arg<1>". When I look at the definition of first<> I see a "BOOST_MPL_AUX_LAMBDA_SUPPORT(1,first,(P))" that should take care of placeholders I guess. But when I look at the definition of the macro, alas : #if !defined(BOOST_MPL_CFG_NO_FULL_LAMBDA_SUPPORT) # define BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(i, name, params) /**/ # define BOOST_MPL_AUX_LAMBDA_SUPPORT(i,name,params) /**/ What's the story here? My compiler is not good enough? Could be... While we're at it, should I put a BOOST_MPL_AUX_LAMBDA_SUPPORT(1,remove_duplicates,(P)) at the bottom of remove_duplicates<> ? Would it make my metafunction work with lambda placeholders? Thanks, Jean-Louis Leroy = = = = = = = = = = = = = = = = = = = = = = = = = Fortis disclaimer : http://www.fortis.be/legal/disclaimer.htm Privacy policy related to banking activities of Fortis: http://www.fortis.be/legal/privacy_policy.htm = = = = = = = = = = = = = = = = = = = = = = = = =