Removed boost namespace to avoid name clashes with newer versions of boost.

dlib/enable_if.h

-// Boost enable_if library
-
 // Copyright 2003 (C) The Trustees of Indiana University.
-
 // Use, modification, and distribution is subject to the Boost Software
 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
 // http://www.boost.org/LICENSE_1_0.txt)
-
 //    Authors: Jaakko Jarvi (jajarvi at osl.iu.edu)
 //             Jeremiah Willcock (jewillco at osl.iu.edu)
 //             Andrew Lumsdaine (lums at osl.iu.edu)
-
 #ifndef DLIB_BOOST_UTILITY_ENABLE_IF_HPP
 #define DLIB_BOOST_UTILITY_ENABLE_IF_HPP
 
-
-#ifndef BOOST_UTILITY_ENABLE_IF_HPP
-#define BOOST_UTILITY_ENABLE_IF_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
-
-#ifndef BOOST_NO_SFINAE
-
-namespace boost
+namespace dlib 
 {
  
   template <bool B, class T = void>
@@ -70,71 +56,7 @@ namespace boost
   template <class Cond, class T> 
   struct lazy_disable_if : public lazy_disable_if_c<Cond::value, T> {};
 
-} // namespace boost
-
-#else
-
-namespace boost 
-{
-
-  namespace detail { typedef void enable_if_default_T; }
-
-  template <typename T>
-  struct enable_if_does_not_work_on_this_compiler;
-
-  template <bool B, class T = detail::enable_if_default_T>
-  struct enable_if_c : enable_if_does_not_work_on_this_compiler<T>
-  { };
-
-  template <bool B, class T = detail::enable_if_default_T> 
-  struct disable_if_c : enable_if_does_not_work_on_this_compiler<T>
-  { };
-
-  template <bool B, class T = detail::enable_if_default_T> 
-  struct lazy_enable_if_c : enable_if_does_not_work_on_this_compiler<T>
-  { };
-
-  template <bool B, class T = detail::enable_if_default_T> 
-  struct lazy_disable_if_c : enable_if_does_not_work_on_this_compiler<T>
-  { };
-
-  template <class Cond, class T = detail::enable_if_default_T> 
-  struct enable_if : enable_if_does_not_work_on_this_compiler<T>
-  { };
-
-  template <class Cond, class T = detail::enable_if_default_T> 
-  struct disable_if : enable_if_does_not_work_on_this_compiler<T>
-  { };
-
-  template <class Cond, class T = detail::enable_if_default_T> 
-  struct lazy_enable_if : enable_if_does_not_work_on_this_compiler<T>
-  { };
-
-  template <class Cond, class T = detail::enable_if_default_T> 
-  struct lazy_disable_if : enable_if_does_not_work_on_this_compiler<T>
-  { };
-
-} // namespace boost
-
-#endif // BOOST_NO_SFINAE
-
-#endif // BOOST_UTILITY_ENABLE_IF_HPP
-
-namespace dlib
-{
-  using boost::enable_if_c;
-  using boost::enable_if_c;
-  using boost::enable_if;
-  using boost::lazy_enable_if_c;
-  using boost::lazy_enable_if_c;
-  using boost::lazy_enable_if;
-  using boost::disable_if_c;
-  using boost::disable_if_c;
-  using boost::disable_if;
-  using boost::lazy_disable_if_c;
-  using boost::lazy_disable_if_c;
-  using boost::lazy_disable_if;
-}
+} // namespace dlib 
 
 #endif // DLIB_BOOST_UTILITY_ENABLE_IF_HPP