Add std::hash specializations for shared_ptr, local_shared_ptr, intrusive_ptr

test/ip_hash_test2.cpp

@@ -0,0 +1,71 @@
+// Copyright 2011, 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/intrusive_ptr.hpp>
+#include <boost/functional/hash.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <functional>
+
+#if defined(BOOST_NO_CXX11_HDR_FUNCTIONAL)
+
+int main() {}
+
+#else
+
+class base
+{
+private:
+
+    int use_count_;
+
+    base(base const &);
+    base & operator=(base const &);
+
+protected:
+
+    base(): use_count_(0)
+    {
+    }
+
+    virtual ~base()
+    {
+    }
+
+public:
+
+    long use_count() const
+    {
+        return use_count_;
+    }
+
+    inline friend void intrusive_ptr_add_ref(base * p)
+    {
+        ++p->use_count_;
+    }
+
+    inline friend void intrusive_ptr_release(base * p)
+    {
+        if(--p->use_count_ == 0) delete p;
+    }
+};
+
+struct X: public base
+{
+};
+
+int main()
+{
+    boost::hash< boost::intrusive_ptr<X> > hasher;
+    std::hash< boost::intrusive_ptr<X> > hasher2;
+
+    boost::intrusive_ptr<X> p1, p2( new X );
+
+    BOOST_TEST_EQ( hasher( p1 ), hasher2( p1 ) );
+    BOOST_TEST_EQ( hasher( p2 ), hasher2( p2 ) );
+
+    return boost::report_errors();
+}
+
+#endif // #if defined(BOOST_NO_CXX11_HDR_FUNCTIONAL)