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Added traversal_category and access_category specializations for MPL lambda support

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[SVN r19921]
This commit is contained in:
Dave Abrahams
2003-09-04 21:15:38 +00:00
parent f801c39a59
commit 2b7ed5f7a8
1 changed files with 26 additions and 0 deletions
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26
include/boost/iterator/iterator_categories.hpp
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@ -29,6 +29,9 @@
#include <boost/mpl/or.hpp>
#include <boost/mpl/apply.hpp>
#include <boost/mpl/aux_/msvc_eti_base.hpp>
#ifdef BOOST_MPL_NO_FULL_LAMBDA_SUPPORT
# include <boost/mpl/placeholders.hpp>
#endif
#include <iterator>
@ -340,6 +343,29 @@ namespace boost {
{
};
# ifdef BOOST_MPL_NO_FULL_LAMBDA_SUPPORT
// Hack because BOOST_MPL_AUX_LAMBDA_SUPPORT doesn't seem to work
// out well. Instantiating the nested apply template also
// requires instantiating iterator_traits on the
// placeholder. Instead we just specialize it as a metafunction
// class.
template <>
struct access_category<mpl::_1>
{
template <class T>
struct apply : access_category<T>
{};
};
template <>
struct traversal_category<mpl::_1>
{
template <class T>
struct apply : traversal_category<T>
{};
};
# endif
# if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
template <typename T>