diff --git a/sp_debug_hooks.cpp b/sp_debug_hooks.cpp
new file mode 100644
index 0000000..741ea3a
--- /dev/null
+++ b/sp_debug_hooks.cpp
@@ -0,0 +1,228 @@
+//
+//  sp_debug_hooks.cpp
+//
+//  Copyright (c) 2002 Peter Dimov
+//
+//  Permission to copy, use, modify, sell and distribute this software
+//  is granted provided this copyright notice appears in all copies.
+//  This software is provided "as is" without express or implied
+//  warranty, and with no claim as to its suitability for any purpose.
+//
+//  http://www.boost.org/libs/smart_ptr/debug_hooks.html
+//
+
+#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
+
+#include <boost/assert.hpp>
+#include <new>
+#include <cstdlib>
+
+int const m = 2; // m * sizeof(int) must be aligned appropriately
+
+int const allocated_scalar  = 0x1234560C;
+int const allocated_array   = 0x1234560A;
+int const adopted_scalar    = 0x0567890C;
+int const adopted_array     = 0x0567890A;
+int const deleted           = 0x498769DE;
+
+using namespace std; // for compilers where things aren't in std
+
+static new_handler get_new_handler()
+{
+    new_handler p = set_new_handler(0);
+    set_new_handler(p);
+    return p;
+}
+
+static void * allocate(size_t n, int mark)
+{
+    int * pm;
+
+    for(;;)
+    {
+        pm = static_cast<int*>(malloc(n + m * sizeof(int)));
+
+        if(pm != 0) break;
+
+        if(new_handler pnh = get_new_handler())
+        {
+            pnh();
+        }
+        else
+        {
+            return 0;
+        }
+    }
+
+    *pm = mark;
+
+    return pm + m;
+}
+
+void * operator new(size_t n) throw(bad_alloc)
+{
+    void * p = allocate(n, allocated_scalar);
+
+#if !defined(BOOST_NO_EXCEPTIONS)
+
+    if(p == 0) throw bad_alloc();
+
+#endif
+
+    return p;
+}
+
+#if !defined(__BORLANDC__) || (__BORLANDC__ > 0x551)
+
+void * operator new(size_t n, nothrow_t const &) throw()
+{
+    return allocate(n, allocated_scalar);
+}
+
+#endif
+
+void * operator new[](size_t n) throw(bad_alloc)
+{
+    void * p = allocate(n, allocated_array);
+
+#if !defined(BOOST_NO_EXCEPTIONS)
+
+    if(p == 0) throw bad_alloc();
+
+#endif
+
+    return p;
+}
+
+#if !defined(__BORLANDC__) || (__BORLANDC__ > 0x551)
+
+void * operator new[](size_t n, nothrow_t const &) throw()
+{
+    return allocate(n, allocated_array);
+}
+
+#endif
+
+namespace boost
+{
+
+void sp_scalar_constructor_hook(void * p)
+{
+    if(p == 0) return;
+
+    int * pm = static_cast<int*>(p);
+    pm -= m;
+
+    BOOST_ASSERT(*pm != adopted_scalar);    // second smart pointer to the same address
+    BOOST_ASSERT(*pm != allocated_array);   // allocated with new[]
+    BOOST_ASSERT(*pm == allocated_scalar);  // not allocated with new
+
+    *pm = adopted_scalar;
+}
+
+void sp_scalar_destructor_hook(void * p)
+{
+    if(p == 0) return;
+
+    int * pm = static_cast<int*>(p);
+    pm -= m;
+
+    BOOST_ASSERT(*pm == adopted_scalar);    // attempt to destroy nonmanaged block
+
+    *pm = allocated_scalar;
+}
+
+// It is not possible to handle the array hooks in a portable manner.
+// The implementation typically reserves a bit of storage for the number
+// of objects in the array, and the argument of the array hook isn't
+// equal to the return value of operator new[].
+
+void sp_array_constructor_hook(void * /* p */)
+{
+/*
+    if(p == 0) return;
+
+    // adjust p depending on the implementation
+
+    int * pm = static_cast<int*>(p);
+    pm -= m;
+
+    BOOST_ASSERT(*pm != adopted_array);     // second smart array pointer to the same address
+    BOOST_ASSERT(*pm != allocated_scalar);  // allocated with new
+    BOOST_ASSERT(*pm == allocated_array);   // not allocated with new[]
+
+    *pm = adopted_array;
+*/
+}
+
+void sp_array_destructor_hook(void * /* p */)
+{
+/*
+    if(p == 0) return;
+
+    // adjust p depending on the implementation
+
+    int * pm = static_cast<int*>(p);
+    pm -= m;
+
+    BOOST_ASSERT(*pm == adopted_array); // attempt to destroy nonmanaged block
+
+    *pm = allocated_array;
+*/
+}
+
+} // namespace boost
+
+void operator delete(void * p) throw()
+{
+    if(p == 0) return;
+
+    int * pm = static_cast<int*>(p);
+    pm -= m;
+
+    BOOST_ASSERT(*pm != deleted);           // double delete
+    BOOST_ASSERT(*pm != adopted_scalar);    // delete p.get();
+    BOOST_ASSERT(*pm != allocated_array);   // allocated with new[]
+    BOOST_ASSERT(*pm == allocated_scalar);  // not allocated with new
+
+    *pm = deleted;
+
+    free(pm);
+}
+
+#if !defined(__BORLANDC__) || (__BORLANDC__ > 0x551)
+
+void operator delete(void * p, nothrow_t const &) throw()
+{
+    ::operator delete(p);
+}
+
+#endif
+
+void operator delete[](void * p) throw()
+{
+    if(p == 0) return;
+
+    int * pm = static_cast<int*>(p);
+    pm -= m;
+
+    BOOST_ASSERT(*pm != deleted);           // double delete
+    BOOST_ASSERT(*pm != adopted_scalar);    // delete p.get();
+    BOOST_ASSERT(*pm != allocated_scalar);  // allocated with new
+    BOOST_ASSERT(*pm == allocated_array);   // not allocated with new[]
+
+    *pm = deleted;
+
+    free(pm);
+}
+
+#if !defined(__BORLANDC__) || (__BORLANDC__ > 0x551)
+
+void operator delete[](void * p, nothrow_t const &) throw()
+{
+    ::operator delete[](p);
+}
+
+#endif
+
+#endif // defined(BOOST_ENABLE_SP_DEBUG_HOOKS)