strided adaptor rewritten to correct defects and optimise performance.

include/boost/range/detail/has_member_size.hpp

@@ -0,0 +1,66 @@
+// Boost.Range library
+//
+// Copyright Neil Groves 2014.
+//
+// Use, modification and distribution are 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).
+//
+// For more information, see http://www.boost.org/libs/range/
+//
+#ifndef BOOST_RANGE_DETAIL_HAS_MEMBER_SIZE_HPP
+#define BOOST_RANGE_DETAIL_HAS_MEMBER_SIZE_HPP
+
+#include <boost/type_traits/is_class.hpp>
+#include <boost/type_traits/is_member_function_pointer.hpp>
+#include <boost/mpl/and.hpp>
+#include <boost/mpl/bool.hpp>
+#include <boost/cstdint.hpp>
+
+namespace boost
+{
+    namespace range_detail
+    {
+
+template<class T>
+class has_member_size_impl
+{
+private:
+    template<class U, U>
+    class check
+    {
+    };
+
+    template<class C>
+    static boost::uint8_t f(check<std::size_t(C::*)(void) const, &C::size>*);
+
+    template<class C>
+    static boost::uint16_t f(...);
+
+public:
+    static const bool value =
+        (sizeof(f<T>(0)) == sizeof(boost::uint8_t));
+
+    typedef typename mpl::if_c<
+        (sizeof(f<T>(0)) == sizeof(boost::uint8_t)),
+        mpl::true_,
+        mpl::false_
+    >::type type;
+};
+
+template<class T>
+struct has_member_size
+{
+    typedef typename mpl::and_<
+        typename is_class<T>::type,
+        typename has_member_size_impl<const T>::type
+    >::type type;
+
+    static const bool value =
+        is_class<T>::value && has_member_size_impl<const T>::value;
+};
+
+    } // namespace range_detail
+}// namespace boost
+ 
+#endif // include guard