Static assert initial checkin

[SVN r8381]

static_assert_example_2.cpp

@@ -0,0 +1,40 @@
+//  (C) Copyright John Maddock 2000.
+//  Permission to copy, use, modify, sell and
+//  distribute this software is granted provided this copyright notice appears
+//  in all copies. This software is provided "as is" without express or implied
+//  warranty, and with no claim as to its suitability for any purpose.
+
+//  See http://www.boost.org for most recent version including documentation.
+
+#include <iterator>
+#include <list>
+#include <deque>
+#include <boost/static_assert.hpp>
+#include <boost/type_traits.hpp>
+
+template <class RandomAccessIterator >
+RandomAccessIterator foo(RandomAccessIterator from, RandomAccessIterator to)
+{
+   // this template can only be used with
+   // random access iterators...
+   typedef typename std::iterator_traits< RandomAccessIterator >::iterator_category cat;
+   BOOST_STATIC_ASSERT((boost::is_convertible<cat, const std::random_access_iterator_tag&>::value));
+   //
+   // detail goes here...
+   return from;
+}
+
+int main()
+{
+	std::deque<int> d;
+	std::list<int> l;
+	foo(d.begin(), d.end()); // OK
+	//foo(l.begin(), l.end()); // error
+	return 0;
+}
+
+
+
+
+
+