Changed noncopyable.h to avoid a name clash with boost 1.56

dlib/noncopyable.h

@@ -7,14 +7,9 @@
 #ifndef DLIB_BOOST_NONCOPYABLE_HPP_INCLUDED
 #define DLIB_BOOST_NONCOPYABLE_HPP_INCLUDED
 
-#ifndef BOOST_NONCOPYABLE_HPP_INCLUDED
-#define BOOST_NONCOPYABLE_HPP_INCLUDED
 
-namespace boost 
+namespace dlib
 {
-
-    namespace noncopyable_  // protection from unintended ADL
-    {
     class noncopyable
     {
         /*!
@@ -27,20 +22,10 @@ namespace boost
         noncopyable() {}
         ~noncopyable() {}
     private:  // emphasize the following members are private
-            noncopyable( const noncopyable& );
-            const noncopyable& operator=( const noncopyable& );
-        };
-    }
-
-    typedef noncopyable_::noncopyable noncopyable;
+        noncopyable(const noncopyable&);
+        const noncopyable& operator=(const noncopyable&);
 
-} // namespace boost
-
-#endif // BOOST_NONCOPYABLE_HPP_INCLUDED
-
-namespace dlib
-{
-    using boost::noncopyable;
+    };
 }
 
 #endif  // DLIB_BOOST_NONCOPYABLE_HPP_INCLUDED