From 9eb621c516de42f453af61a9614902c183ca2bcb Mon Sep 17 00:00:00 2001
From: Dave Abrahams <dave@boostpro.com>
Date: Sat, 20 Sep 2003 21:27:04 +0000
Subject: [PATCH] Handle ETI in BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC, since we
 need to invoke that anyway. Make is_even work with vc6/7.

[SVN r20122]
---
 include/boost/mpl/aux_/begin_end_impl.hpp     |  5 -----
 include/boost/mpl/aux_/traits_lambda_spec.hpp | 20 ++++++++++++++++++-
 include/boost/mpl/math/is_even.hpp            | 18 ++++++++++++++++-
 3 files changed, 36 insertions(+), 7 deletions(-)

diff --git a/include/boost/mpl/aux_/begin_end_impl.hpp b/include/boost/mpl/aux_/begin_end_impl.hpp
index f620011..539e894 100644
--- a/include/boost/mpl/aux_/begin_end_impl.hpp
+++ b/include/boost/mpl/aux_/begin_end_impl.hpp
@@ -71,11 +71,6 @@ AUX_AGLORITM_TRAIT_SPEC(end, nested_begin_end_tag, typename Sequence::end)
 AUX_AGLORITM_TRAIT_SPEC(begin, non_sequence_tag, void_)
 AUX_AGLORITM_TRAIT_SPEC(end, non_sequence_tag, void_)
 
-#if defined(BOOST_MPL_MSVC_ETI_BUG)
-AUX_AGLORITM_TRAIT_SPEC(begin, int, int)
-AUX_AGLORITM_TRAIT_SPEC(end, int, int)
-#endif
-
 #   undef AUX_AGLORITM_TRAIT_SPEC
 
 
diff --git a/include/boost/mpl/aux_/traits_lambda_spec.hpp b/include/boost/mpl/aux_/traits_lambda_spec.hpp
index e65bb88..40525bd 100644
--- a/include/boost/mpl/aux_/traits_lambda_spec.hpp
+++ b/include/boost/mpl/aux_/traits_lambda_spec.hpp
@@ -25,7 +25,7 @@
 
 #   define BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(i, trait) /**/
 
-#else
+#elif !defined(BOOST_MPL_MSVC_ETI_BUG)
 
 #   define BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(i, trait) \
 template<> struct trait<void_> \
@@ -36,6 +36,24 @@ template<> struct trait<void_> \
 }; \
 /**/
 
+#else
+
+#   define BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(i, trait) \
+template<> struct trait<void_> \
+{ \
+    template< BOOST_MPL_PP_PARAMS(i, typename T) > struct algorithm \
+    { \
+    }; \
+}; \
+template<> struct trait<int> \
+{ \
+    template< BOOST_MPL_PP_PARAMS(i, typename T) > struct algorithm \
+    { \
+        typedef int type; \
+    }; \
+}; \
+/**/
+
 #endif // BOOST_MPL_NO_FULL_LAMBDA_SUPPORT
 
 #endif // BOOST_MPL_AUX_TRAITS_LAMBDA_SPEC_HPP_INCLUDED
diff --git a/include/boost/mpl/math/is_even.hpp b/include/boost/mpl/math/is_even.hpp
index 215c711..1c25797 100644
--- a/include/boost/mpl/math/is_even.hpp
+++ b/include/boost/mpl/math/is_even.hpp
@@ -21,16 +21,32 @@
 #include "boost/mpl/aux_/void_spec.hpp"
 #include "boost/mpl/aux_/lambda_support.hpp"
 #include "boost/mpl/aux_/config/eti.hpp"
+#include "boost/detail/workaround.hpp"
 
 namespace boost { namespace mpl {
 
 namespace math {
 
+#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+namespace aux
+{
+  template <class N>
+  struct is_even_base
+  {
+      enum { value = (N::value % 2) == 0 };
+      typedef bool_<value> type;
+  };
+}
+#endif 
 template<
       typename BOOST_MPL_AUX_VOID_SPEC_PARAM(N)
     >
 struct is_even
-    : bool_<((N::value % 2) == 0)>
+#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+  : aux::is_even_base<N>::type
+#else
+  : bool_<((N::value % 2) == 0)>
+#endif 
 {
     BOOST_MPL_AUX_LAMBDA_SUPPORT(1,is_even,(N))
 };