Add the missing test.

[SVN r32776]

hash/test/Jamfile

@@ -33,7 +33,7 @@ rule hash-test ( names + : extras * )
             [ hash-test hash_range_test ]
             [ hash-test hash_custom_test ]
             [ hash-test hash_global_namespace_test ]
-#            [ hash-test hash_friend_test ]
+            [ hash-test hash_friend_test ]
             [ hash-test hash_built_in_array_test ]
             [ hash-test hash_value_array_test ]
             [ hash-test hash_vector_test ]

hash/test/Jamfile.v2

@@ -25,7 +25,7 @@ test-suite functional/hash
         [ run hash_range_test.cpp framework ]
         [ run hash_custom_test.cpp framework ]
         [ run hash_global_namespace_test.cpp framework ]
-#        [ run hash_friend_test.cpp framework ]
+        [ run hash_friend_test.cpp framework ]
         [ run hash_built_in_array_test.cpp framework ]
         [ run hash_value_array_test.cpp framework ]
         [ run hash_vector_test.cpp framework ]

hash/test/hash_friend_test.cpp

@@ -0,0 +1,96 @@
+
+//  (C) Copyright Daniel James 2005.
+//  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)
+
+#include <boost/config.hpp>
+#include <cstddef>
+
+namespace test
+{
+    template <class T>
+    struct custom
+    {
+        int value_;
+
+        std::size_t hash() const
+        {
+            return value_ * 10;
+        }
+
+#if !defined(BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP)
+        friend std::size_t hash_value(custom const& x)
+        {
+            return x.hash();
+        }
+#endif
+
+        custom(int x) : value_(x) {}
+    };
+}
+
+#if defined(BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP)
+namespace boost
+{
+    template <class T>
+    std::size_t hash_value(test::custom<T> x)
+    {
+        return x.hash();
+    }
+}
+#endif
+
+#include "./config.hpp"
+
+#ifdef TEST_EXTENSIONS
+#  ifdef TEST_STD_INCLUDES
+#    include <functional>
+#  else
+#    include <boost/functional/hash/hash.hpp>
+#  endif
+#endif
+
+#define BOOST_TEST_MAIN
+#include <boost/test/unit_test.hpp>
+
+#ifdef TEST_EXTENSIONS
+
+#include <vector>
+#include <string>
+#include <cctype>
+
+BOOST_AUTO_TEST_CASE(custom_tests)
+{
+    HASH_NAMESPACE::hash<test::custom<int> > custom_hasher;
+    BOOST_CHECK(custom_hasher(10) == 100u);
+    test::custom<int> x(55);
+    BOOST_CHECK(custom_hasher(x) == 550u);
+
+    {
+        using namespace HASH_NAMESPACE;
+        BOOST_CHECK(custom_hasher(x) == hash_value(x));
+    }
+
+    std::vector<test::custom<int> > custom_vector;
+    custom_vector.push_back(5);
+    custom_vector.push_back(25);
+    custom_vector.push_back(35);
+
+    std::size_t seed = 0;
+    HASH_NAMESPACE::hash_combine(seed, test::custom<int>(5));
+    HASH_NAMESPACE::hash_combine(seed, test::custom<int>(25));
+    HASH_NAMESPACE::hash_combine(seed, test::custom<int>(35));
+
+    std::size_t seed2 = 0;
+    HASH_NAMESPACE::hash_combine(seed2, 50u);
+    HASH_NAMESPACE::hash_combine(seed2, 250u);
+    HASH_NAMESPACE::hash_combine(seed2, 350u);
+
+    BOOST_CHECK(seed ==
+            HASH_NAMESPACE::hash_range(custom_vector.begin(), custom_vector.end()));
+    BOOST_CHECK(seed == seed2);
+}
+
+#endif // TEST_EXTENSIONS
+