Add ref_compare for weak_ptr. Refs #2849.

[SVN r51979]

include/boost/bind/bind.hpp

@@ -48,6 +48,8 @@
 namespace boost
 {
 
+template<class T> class weak_ptr;
+
 namespace _bi // implementation details
 {
 
@@ -126,6 +128,13 @@ private:
     T t_;
 };
 
+// ref_compare for weak_ptr
+
+template<class T> bool ref_compare( value< weak_ptr<T> > const & a, value< weak_ptr<T> > const & b, int )
+{
+    return !(a.get() < b.get()) && !(b.get() < a.get());
+}
+
 // type
 
 template<class T> class type {};

test/Jamfile.v2

@@ -41,4 +41,5 @@ test-suite "bind"
       [ run bind_eq2_test.cpp ]
       [ run mem_fn_ref_test.cpp ]
       [ run bind_ref_test.cpp ]
+      [ run bind_eq3_test.cpp ]
     ;

test/bind_eq3_test.cpp

@@ -0,0 +1,45 @@
+#include <boost/config.hpp>
+
+#if defined(BOOST_MSVC)
+#pragma warning(disable: 4786)  // identifier truncated in debug info
+#pragma warning(disable: 4710)  // function not inlined
+#pragma warning(disable: 4711)  // function selected for automatic inline expansion
+#pragma warning(disable: 4514)  // unreferenced inline removed
+#endif
+
+//
+//  bind_eq3_test.cpp - function_equal with bind and weak_ptr
+//
+//  Copyright (c) 2004, 2005, 2009 Peter Dimov
+//
+//  Distributed under 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/bind.hpp>
+#include <boost/function_equal.hpp>
+#include <boost/weak_ptr.hpp>
+#include <boost/detail/lightweight_test.hpp>
+
+int f( boost::weak_ptr<void> wp )
+{
+    return wp.use_count();
+}
+
+template< class F > void test_self_equal( F f )
+{
+#ifdef BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP
+    using boost::function_equal;
+#endif
+
+    BOOST_TEST( function_equal( f, f ) );
+}
+
+int main()
+{
+    test_self_equal( boost::bind( f, _1 ) );
+    test_self_equal( boost::bind( f, boost::weak_ptr<void>() ) );
+
+    return boost::report_errors();
+}