Add test with types that return void* from begin/end. Refs #36.

test/hash_container_test2.cpp

@@ -0,0 +1,39 @@
+// Copyright 2024 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>
+
+struct X1
+{
+    void* begin() const { return nullptr; }
+    void* end() const { return nullptr; }
+};
+
+std::size_t hash_value( X1 const& )
+{
+    return 1;
+}
+
+struct X2
+{
+    void const* begin() const { return nullptr; }
+    void const* end() const { return nullptr; }
+};
+
+std::size_t hash_value( X2 const& )
+{
+    return 2;
+}
+
+int main()
+{
+    X1 x1;
+    BOOST_TEST_EQ( boost::hash<X1>()( x1 ), 1 );
+
+    X2 x2;
+    BOOST_TEST_EQ( boost::hash<X2>()( x2 ), 2 );
+
+    return boost::report_errors();
+}