Chris@16: //  (C) Copyright Gennadiy Rozental 2001-2008.
Chris@16: //  Distributed under the Boost Software License, Version 1.0.
Chris@16: //  (See accompanying file LICENSE_1_0.txt or copy at 
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: //  See http://www.boost.org/libs/test for the library home page.
Chris@16: //
Chris@16: //  File        : $RCSfile$
Chris@16: //
Chris@101: //  Version     : $Revision$
Chris@16: //
Chris@16: //  Description : enhanced result for test predicate that include message explaining failure
Chris@16: // ***************************************************************************
Chris@16: 
Chris@16: #ifndef BOOST_TEST_PREDICATE_RESULT_HPP_012705GER
Chris@16: #define BOOST_TEST_PREDICATE_RESULT_HPP_012705GER
Chris@16: 
Chris@16: // Boost.Test
Chris@16: #include <boost/test/utils/class_properties.hpp>
Chris@16: #include <boost/test/utils/wrap_stringstream.hpp>
Chris@16: #include <boost/test/utils/basic_cstring/basic_cstring.hpp>
Chris@16: 
Chris@16: // Boost
Chris@16: #include <boost/shared_ptr.hpp>
Chris@16: #include <boost/detail/workaround.hpp>
Chris@16: 
Chris@16: // STL
Chris@16: #include <cstddef>          // for std::size_t
Chris@16: 
Chris@16: #include <boost/test/detail/suppress_warnings.hpp>
Chris@16: 
Chris@16: //____________________________________________________________________________//
Chris@16: 
Chris@16: namespace boost {
Chris@16: 
Chris@16: namespace test_tools {
Chris@16: 
Chris@16: // ************************************************************************** //
Chris@16: // **************                predicate_result              ************** //
Chris@16: // ************************************************************************** //
Chris@16: 
Chris@16: class BOOST_TEST_DECL predicate_result {
Chris@16:     typedef unit_test::const_string      const_string;
Chris@16:     struct dummy { void nonnull() {}; };
Chris@16:     typedef void (dummy::*safe_bool)();
Chris@16: 
Chris@16: public:
Chris@16:     // Constructor
Chris@16:     predicate_result( bool pv_ ) 
Chris@16:     : p_predicate_value( pv_ )
Chris@16:     {}
Chris@16: 
Chris@16:     template<typename BoolConvertable>
Chris@16:     predicate_result( BoolConvertable const& pv_ ) : p_predicate_value( !!pv_ ) {}
Chris@16: 
Chris@16:     // Access methods
Chris@16:     bool                operator!() const           { return !p_predicate_value; }
Chris@16:     void                operator=( bool pv_ )       { p_predicate_value.value = pv_; }
Chris@16:     operator            safe_bool() const           { return !!p_predicate_value ? &dummy::nonnull : 0; }
Chris@16: 
Chris@16:     // Public properties
Chris@16:     BOOST_READONLY_PROPERTY( bool, (predicate_result) ) p_predicate_value;
Chris@16: 
Chris@16:     // Access methods
Chris@16:     bool                has_empty_message() const   { return !m_message; }
Chris@16:     wrap_stringstream&  message()
Chris@16:     {
Chris@16:         if( !m_message )
Chris@16:             m_message.reset( new wrap_stringstream );
Chris@16: 
Chris@16:         return *m_message;
Chris@16:     }
Chris@16:     const_string        message() const                   { return !m_message ? const_string() : const_string( m_message->str() ); }
Chris@16: 
Chris@16: private:
Chris@16:     // Data members
Chris@16:     shared_ptr<wrap_stringstream> m_message;
Chris@16: };
Chris@16: 
Chris@16: } // namespace test_tools
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: //____________________________________________________________________________//
Chris@16: 
Chris@16: #include <boost/test/detail/enable_warnings.hpp>
Chris@16: 
Chris@16: #endif // BOOST_TEST_PREDICATE_RESULT_HPP_012705GER