Incomplete work for using Boost.Polygon to compute medial axis

xs/src/boost/test/predicate_result.hpp

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+//  (C) Copyright Gennadiy Rozental 2001-2008.
+//  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)
+
+//  See http://www.boost.org/libs/test for the library home page.
+//
+//  File        : $RCSfile$
+//
+//  Version     : $Revision: 54633 $
+//
+//  Description : enhanced result for test predicate that include message explaining failure
+// ***************************************************************************
+
+#ifndef BOOST_TEST_PREDICATE_RESULT_HPP_012705GER
+#define BOOST_TEST_PREDICATE_RESULT_HPP_012705GER
+
+// Boost.Test
+#include <boost/test/utils/class_properties.hpp>
+#include <boost/test/utils/wrap_stringstream.hpp>
+#include <boost/test/utils/basic_cstring/basic_cstring.hpp>
+
+// Boost
+#include <boost/shared_ptr.hpp>
+#include <boost/detail/workaround.hpp>
+
+// STL
+#include <cstddef>          // for std::size_t
+
+#include <boost/test/detail/suppress_warnings.hpp>
+
+//____________________________________________________________________________//
+
+namespace boost {
+
+namespace test_tools {
+
+// ************************************************************************** //
+// **************                predicate_result              ************** //
+// ************************************************************************** //
+
+class BOOST_TEST_DECL predicate_result {
+    typedef unit_test::const_string      const_string;
+    struct dummy { void nonnull() {}; };
+    typedef void (dummy::*safe_bool)();
+
+public:
+    // Constructor
+    predicate_result( bool pv_ ) 
+    : p_predicate_value( pv_ )
+    {}
+
+    template<typename BoolConvertable>
+    predicate_result( BoolConvertable const& pv_ ) : p_predicate_value( !!pv_ ) {}
+
+    // Access methods
+    bool                operator!() const           { return !p_predicate_value; }
+    void                operator=( bool pv_ )       { p_predicate_value.value = pv_; }
+    operator            safe_bool() const           { return !!p_predicate_value ? &dummy::nonnull : 0; }
+
+    // Public properties
+    BOOST_READONLY_PROPERTY( bool, (predicate_result) ) p_predicate_value;
+
+    // Access methods
+    bool                has_empty_message() const   { return !m_message; }
+    wrap_stringstream&  message()
+    {
+        if( !m_message )
+            m_message.reset( new wrap_stringstream );
+
+        return *m_message;
+    }
+    const_string        message() const                   { return !m_message ? const_string() : const_string( m_message->str() ); }
+
+private:
+    // Data members
+    shared_ptr<wrap_stringstream> m_message;
+};
+
+} // namespace test_tools
+
+} // namespace boost
+
+//____________________________________________________________________________//
+
+#include <boost/test/detail/enable_warnings.hpp>
+
+#endif // BOOST_TEST_PREDICATE_RESULT_HPP_012705GER