Add detail/is_unordered_range.hpp

2021-10-16 21:01:07 +03:00
parent 00c837d523
commit d308495a67
3 changed files with 133 additions and 0 deletions
@@ -0,0 +1,34 @@
+// Copyright 2017 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#ifndef BOOST_HASH_DETAIL_IS_UNORDERED_RANGE_HPP_INCLUDED
+#define BOOST_HASH_DETAIL_IS_UNORDERED_RANGE_HPP_INCLUDED
+
+#include <boost/container_hash/detail/is_range.hpp>
+#include <boost/type_traits/integral_constant.hpp>
+#include <boost/type_traits/is_same.hpp>
+
+namespace boost
+{
+namespace hash_detail
+{
+
+template<class T, class E = true_type> struct has_hasher_: false_type
+{
+};
+
+template<class T> struct has_hasher_< T, integral_constant< bool,
+        is_same<typename T::hasher, typename T::hasher>::value
+    > >: true_type
+{
+};
+
+template<class T> struct is_unordered_range: integral_constant< bool, is_range<T>::value && has_hasher_<T>::value >
+{
+};
+
+} // namespace hash_detail
+} // namespace boost
+
+#endif // #ifndef BOOST_HASH_DETAIL_IS_UNORDERED_RANGE_HPP_INCLUDED