updated is_avalanching trait protocol

test/unordered/hash_is_avalanching_test.cpp

@@ -1,4 +1,5 @@
 // Copyright 2022 Peter Dimov
+// Copyright 2024 Joaquin M Lopez Munoz
 // Distributed under the Boost Software License, Version 1.0.
 // https://www.boost.org/LICENSE_1_0.txt
 
@@ -26,6 +27,7 @@ namespace unordered
 
 #include <boost/unordered/hash_traits.hpp>
 #include <boost/core/lightweight_test_trait.hpp>
+#include <type_traits>
 
 struct X1
 {
@@ -36,6 +38,27 @@ struct X2
     typedef void is_avalanching;
 };
 
+struct X4
+{
+    using is_avalanching = std::false_type;
+};
+
+struct X5
+{
+    using is_avalanching = std::true_type;
+};
+
+struct X6
+{
+    using is_avalanching = boost::false_type;
+};
+
+struct X7
+{
+    using is_avalanching = boost::true_type;
+};
+
+
 int main()
 {
     using boost::unordered::hash_is_avalanching;
@@ -43,6 +66,10 @@ int main()
     BOOST_TEST_TRAIT_FALSE((hash_is_avalanching<X1>));
     BOOST_TEST_TRAIT_TRUE((hash_is_avalanching<X2>));
     BOOST_TEST_TRAIT_TRUE((hash_is_avalanching<X3>));
+    BOOST_TEST_TRAIT_FALSE((hash_is_avalanching<X4>));
+    BOOST_TEST_TRAIT_TRUE((hash_is_avalanching<X5>));
+    BOOST_TEST_TRAIT_FALSE((hash_is_avalanching<X6>));
+    BOOST_TEST_TRAIT_TRUE((hash_is_avalanching<X7>));
 
     return boost::report_errors();
 }