From 3155044abde5051c202553765f5c616903297770 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jaakko=20J=C3=A4rvi?= <jarvi@cs.tamu.edu>
Date: Fri, 5 Dec 2003 21:38:43 +0000
Subject: [PATCH] added dummy versions of enable_if templates for platforms
 that have BOOST_NO_SFINAE defined

[SVN r21154]
---
 include/boost/utility/enable_if.hpp | 41 +++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/include/boost/utility/enable_if.hpp b/include/boost/utility/enable_if.hpp
index 0498d36..df126c1 100644
--- a/include/boost/utility/enable_if.hpp
+++ b/include/boost/utility/enable_if.hpp
@@ -15,6 +15,7 @@
 #define BOOST_UTILITY_ENABLE_IF_HPP
 
 #include <boost/config.hpp>
+#include <boost/static_assert.hpp>
 
 // Even the definition of enable_if causes problems on some compilers,
 // so it's macroed out for all compilers that do not support SFINAE
@@ -71,6 +72,46 @@ namespace boost
 
 } // namespace boost
 
+#else
+
+namespace boost {
+
+  BOOST_STATIC_CONSTANT(bool, enable_if_does_not_work_on_this_compiler = false);
+
+  template <bool B, class T = void> 
+  struct enable_if_c
+    { BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
+
+  template <bool B, class T = void> 
+  struct disable_if_c
+    { BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
+
+  template <bool B, class T = void> 
+  struct lazy_enable_if_c
+    { BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
+
+  template <bool B, class T = void> 
+  struct lazy_disable_if_c
+    { BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
+
+  template <class Cond, class T = void> 
+  struct enable_if
+    { BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
+
+  template <class Cond, class T = void> 
+  struct disable_if
+    { BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
+
+  template <class Cond, class T = void> 
+  struct lazy_enable_if
+    { BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
+
+  template <class Cond, class T = void> 
+  struct lazy_disable_if
+    { BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
+
+} // namespace boost
+
 #endif // BOOST_NO_SFINAE
 
 #endif