ext-boost: Add safe-numerics.

boost/safe_numerics/concept/numeric.hpp

@@ -0,0 +1,29 @@
+#ifndef BOOST_NUMERIC_CONCEPT_NUMERIC_HPP
+#define BOOST_NUMERIC_CONCEPT_NUMERIC_HPP
+
+//  Copyright (c) 2012 Robert Ramey
+//
+// Distributed under 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)
+
+#include <limits>
+
+namespace boost {
+namespace safe_numerics {
+
+template<class T>
+struct Numeric {
+    // if your program traps here, you need to create a
+    // std::numeric_limits class for your type T.  see
+    // see C++ standard 18.3.2.2
+    static_assert(
+        std::numeric_limits<T>::is_specialized,
+        "std::numeric_limits<T> has not been specialized for this type"
+    );
+};
+
+} // safe_numerics
+} // boost
+
+#endif // BOOST_NUMERIC_CONCEPT_NUMERIC_HPP