Chris@16: //  (C) Copyright Gennadiy Rozental 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 : contains definition for all test tools in test toolbox
Chris@16: // ***************************************************************************
Chris@16: 
Chris@16: #ifndef BOOST_TEST_LAZY_OSTREAM_HPP_070708GER
Chris@16: #define BOOST_TEST_LAZY_OSTREAM_HPP_070708GER
Chris@16: 
Chris@16: // Boost.Test
Chris@16: #include <boost/test/detail/config.hpp>
Chris@16: 
Chris@16: // STL
Chris@16: #include <iosfwd>
Chris@16: 
Chris@16: #include <boost/test/detail/suppress_warnings.hpp>
Chris@16: 
Chris@16: //____________________________________________________________________________//
Chris@16: 
Chris@16: // ************************************************************************** //
Chris@16: // **************                  lazy_ostream                ************** //
Chris@16: // ************************************************************************** //
Chris@16: 
Chris@16: namespace boost {
Chris@16: 
Chris@16: namespace unit_test {
Chris@16: 
Chris@16: class lazy_ostream {
Chris@16: public:
Chris@16:     static lazy_ostream&    instance()                                              { static lazy_ostream inst; return inst; }
Chris@16: 
Chris@16:     friend std::ostream&    operator<<( std::ostream& ostr, lazy_ostream const& o ) { return o( ostr ); }
Chris@16: 
Chris@16:     // access method
Chris@16:     bool                    empty() const                                           { return m_empty; }
Chris@16: 
Chris@16:     // actual printing interface; to be accessed only by this class and children
Chris@16:     virtual std::ostream&   operator()( std::ostream& ostr ) const                  { return ostr; }
Chris@16: protected:
Chris@16:     explicit                lazy_ostream( bool empty = true ) : m_empty( empty )    {}
Chris@16: 
Chris@16:     // protected destructor to make sure right one is called
Chris@16: #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582))
Chris@16: public:
Chris@16: #endif
Chris@16:     BOOST_TEST_PROTECTED_VIRTUAL ~lazy_ostream()                                    {}
Chris@16: 
Chris@16: private:
Chris@16:     // Data members
Chris@16:     bool                    m_empty;
Chris@16: };
Chris@16: 
Chris@16: //____________________________________________________________________________//
Chris@16: 
Chris@16: template<typename T>
Chris@16: class lazy_ostream_impl : public lazy_ostream {
Chris@16: public:
Chris@16:     lazy_ostream_impl( lazy_ostream const& prev, T value )
Chris@16:     : lazy_ostream( false )
Chris@16:     , m_prev( prev )
Chris@16:     , m_value( value )
Chris@16:     {}
Chris@16: private:
Chris@16:     virtual std::ostream&   operator()( std::ostream& ostr ) const
Chris@16:     {
Chris@16:         return m_prev(ostr) << m_value;
Chris@16:     }
Chris@16: 
Chris@16:     // Data members
Chris@16:     lazy_ostream const&     m_prev;
Chris@16:     T                       m_value;
Chris@16: };
Chris@16: 
Chris@16: //____________________________________________________________________________//
Chris@16: 
Chris@16: template<typename T>
Chris@16: inline lazy_ostream_impl<T const&>
Chris@16: operator<<( lazy_ostream const& prev, T const& v )
Chris@16: {
Chris@16:     return lazy_ostream_impl<T const&>( prev, v );
Chris@16: }
Chris@16: 
Chris@16: //____________________________________________________________________________//
Chris@16: 
Chris@16: #if BOOST_TEST_USE_STD_LOCALE
Chris@16: 
Chris@16: template<typename R,typename S>
Chris@16: inline lazy_ostream_impl<R& (BOOST_TEST_CALL_DECL *)(S&)>
Chris@16: operator<<( lazy_ostream const& prev, R& (BOOST_TEST_CALL_DECL *man)(S&) )
Chris@16: {
Chris@16:     return lazy_ostream_impl<R& (BOOST_TEST_CALL_DECL *)(S&)>( prev, man );
Chris@16: }
Chris@16: 
Chris@16: //____________________________________________________________________________//
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: } // namespace unit_test
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_LAZY_OSTREAM_HPP_070708GER