void function_pointer_tests()
{
    compile_time_tests((void(**)()) 0);
    compile_time_tests((int(**)(int)) 0);

    HASH_NAMESPACE::hash<void(*)()> hasher_void;
    HASH_NAMESPACE::hash<int(*)(int)> hasher_int;

    BOOST_TEST(&void_func1 != &void_func2);
    BOOST_TEST(&int_func1 != &int_func2);

    BOOST_TEST(hasher_void(0) == hasher_void(0));
    BOOST_TEST(hasher_void(&void_func1) == hasher_void(&void_func1));
    BOOST_TEST(hasher_void(&void_func1) != hasher_void(&void_func2));
    BOOST_TEST(hasher_void(&void_func1) != hasher_void(0));
    BOOST_TEST(hasher_int(0) == hasher_int(0));
    BOOST_TEST(hasher_int(&int_func1) == hasher_int(&int_func1));
    BOOST_TEST(hasher_int(&int_func1) != hasher_int(&int_func2));
    BOOST_TEST(hasher_int(&int_func1) != hasher_int(0));
#if defined(TEST_EXTENSIONS)
    BOOST_TEST(hasher_void(&void_func1)
            == HASH_NAMESPACE::hash_value(&void_func1));
    BOOST_TEST(hasher_int(&int_func1)
            == HASH_NAMESPACE::hash_value(&int_func1));

    // This isn't specified in Peter's proposal:
    BOOST_TEST(hasher_void(0) == 0);
#endif
}
void fwd_test1()
{
    test::test_type1<int> x(5);
    test::test_type1<std::string> y("Test");

    HASH_NAMESPACE::hash<int> hasher_int;
    HASH_NAMESPACE::hash<std::string> hasher_string;
    HASH_NAMESPACE::hash<test::test_type1<int> > hasher_test_int;
    HASH_NAMESPACE::hash<test::test_type1<std::string> > hasher_test_string;

    BOOST_TEST(hasher_int(5) == hasher_test_int(x));
    BOOST_TEST(hasher_string("Test") == hasher_test_string(y));
}