From: Jaap Suter (J.Suter_at_[hidden])
Date: 2003-03-30 13:18:19
I apologize, but once again I'm unable to get a lambda expression working
with the MPL.
The code works fine with the Intel and GCC compiler. On MSVC I get the
error C2039: 'lhs_index' : is not a member of 'boost::mpl::arg<N>'
The error occurs on the line with the boost static constant. It does not
happen if the template is not instantiated. I have tried using the
AUX_VOID_SPEC macro, but that didn't really help. I even tried closing my
own namespace, and doing an AUX_VOID_SPEC inside the MPL namespace, as done
I also tried deriving predicate from mpl::equal_to that simply compares the
result to true_c, hoping that mpl::equal_to would give me the lambda support
for free. That didn't work either.
Any advice would be greatly appreciated.
template < size_t LhsIndex, size_t RhsIndex, int Sign >
typedef mpl::size_t< LhsIndex > lhs_index;
typedef mpl::size_t< RhsIndex > rhs_index;
typedef mpl::int_< Sign > type;
template < class Signature, class LhsIndex, class RhsIndex >
typedef typename mpl::and_<
typename mpl::equal_to< typename Signature::lhs_index, LhsIndex
typename mpl::equal_to< typename Signature::rhs_index, RhsIndex
BOOST_MPL_AUX_LAMBDA_SUPPORT( 3, predicate, (Signature, LhsIndex,
// Test code:
typedef mpl::vector< signature< 1, 1, 1 >,
signature< 4, 4, 0 >,
signature< 5, 5, 0 >,
signature< 4, 5, 1 > > signatures;
typedef mpl::find_if< signatures, predicate< mpl::_1, mpl::size_t< 4 >,
mpl::size_t< 5 > > >::type iter_0;
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