Implement boost::hash_unordered_range

test/hash_unordered_range_test.cpp

@@ -0,0 +1,33 @@
+// Copyright 2021, 2022 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/container_hash/hash.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <algorithm>
+#include <vector>
+
+int main()
+{
+    int const N = 16;
+
+    std::vector<int> v;
+
+    for( int i = 0; i < N; ++i )
+    {
+        v.push_back( i );
+    }
+
+    std::size_t h0 = boost::hash_unordered_range( v.begin(), v.end() );
+
+    int const M = 256;
+
+    for( int i = 0; i < M; ++i )
+    {
+        std::next_permutation( v.begin(), v.end() );
+        std::size_t h1 = boost::hash_unordered_range( v.begin(), v.end() );
+        BOOST_TEST_EQ( h0, h1 );
+    }
+
+    return boost::report_errors();
+}