From 55b227c6217178bbfdd8ce500904c10bca503429 Mon Sep 17 00:00:00 2001
From: John Maddock <john@johnmaddock.co.uk>
Date: Thu, 21 Apr 2005 15:58:33 +0000
Subject: [PATCH] Fixes for is_base_and_derived when compiling with /vmg on
 VC7.1.

[SVN r28387]
---
 include/boost/type_traits/is_base_and_derived.hpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/boost/type_traits/is_base_and_derived.hpp b/include/boost/type_traits/is_base_and_derived.hpp
index 7e0ffe5..cf420d8 100644
--- a/include/boost/type_traits/is_base_and_derived.hpp
+++ b/include/boost/type_traits/is_base_and_derived.hpp
@@ -110,9 +110,19 @@ google.com and links therein.
 template <typename B, typename D>
 struct bd_helper
 {
+   //
+   // This VC7.1 specific workaround stops the compiler from generating
+   // an internal compiler error when compiling with /vmg (thanks to
+   // Aleksey Gurtovoy for figuring out the workaround).
+   //
+#if !BOOST_WORKAROUND(BOOST_MSVC, == 1310)
     template <typename T>
     static type_traits::yes_type check_sig(D const volatile *, T);
     static type_traits::no_type  check_sig(B const volatile *, int);
+#else
+    static type_traits::yes_type check_sig(D const volatile *, long);
+    static type_traits::no_type  check_sig(B const volatile * const&, int);
+#endif
 };
 
 template<typename B, typename D>
@@ -120,7 +130,11 @@ struct is_base_and_derived_impl2
 {
     struct Host
     {
+#if !BOOST_WORKAROUND(BOOST_MSVC, == 1310)
         operator B const volatile *() const;
+#else
+        operator B const volatile * const&() const;
+#endif
         operator D const volatile *();
     };