整理

include/boost/container_hash/is_unordered_range.hpp

@@ -0,0 +1,38 @@
+// Copyright 2017 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#ifndef BOOST_HASH_IS_UNORDERED_RANGE_HPP_INCLUDED
+#define BOOST_HASH_IS_UNORDERED_RANGE_HPP_INCLUDED
+
+#include <boost/container_hash/is_range.hpp>
+#include <type_traits>
+
+namespace boost
+{
+namespace hash_detail
+{
+
+template<class T, class E = std::true_type> struct has_hasher_: std::false_type
+{
+};
+
+template<class T> struct has_hasher_< T, std::integral_constant< bool,
+        std::is_same<typename T::hasher, typename T::hasher>::value
+    > >: std::true_type
+{
+};
+
+} // namespace hash_detail
+
+namespace container_hash
+{
+
+template<class T> struct is_unordered_range: std::integral_constant< bool, is_range<T>::value && hash_detail::has_hasher_<T>::value >
+{
+};
+
+} // namespace container_hash
+} // namespace boost
+
+#endif // #ifndef BOOST_HASH_IS_UNORDERED_RANGE_HPP_INCLUDED