// (C) Copyright Gennadiy Rozental 2001.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/test for the library home page.
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//
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// Description : contains definition for all test tools in test toolbox
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// ***************************************************************************
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#ifndef BOOST_TEST_UTILS_LAZY_OSTREAM_HPP
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#define BOOST_TEST_UTILS_LAZY_OSTREAM_HPP
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// Boost.Test
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#include <boost/test/detail/config.hpp>
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// STL
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#include <iosfwd>
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#include <boost/test/detail/suppress_warnings.hpp>
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//____________________________________________________________________________//
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// ************************************************************************** //
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// ************** lazy_ostream ************** //
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// ************************************************************************** //
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namespace boost {
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namespace unit_test {
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class BOOST_TEST_DECL lazy_ostream {
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public:
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virtual ~lazy_ostream() {}
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static lazy_ostream& instance() { return inst; }
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#if !defined(BOOST_EMBTC)
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friend std::ostream& operator<<( std::ostream& ostr, lazy_ostream const& o ) { return o( ostr ); }
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#else
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friend std::ostream& operator<<( std::ostream& ostr, lazy_ostream const& o );
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#endif
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// access method
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bool empty() const { return m_empty; }
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// actual printing interface; to be accessed only by this class and children
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virtual std::ostream& operator()( std::ostream& ostr ) const { return ostr; }
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protected:
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explicit lazy_ostream( bool p_empty = true ) : m_empty( p_empty ) {}
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private:
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// Data members
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bool m_empty;
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static lazy_ostream inst;
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};
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#if defined(BOOST_EMBTC)
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inline std::ostream& operator<<( std::ostream& ostr, lazy_ostream const& o ) { return o( ostr ); }
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#endif
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//____________________________________________________________________________//
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template<typename PrevType, typename T, typename StorageT=T const&>
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class lazy_ostream_impl : public lazy_ostream {
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public:
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lazy_ostream_impl( PrevType const& prev, T const& value )
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: lazy_ostream( false )
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, m_prev( prev )
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, m_value( value )
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{
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}
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std::ostream& operator()( std::ostream& ostr ) const BOOST_OVERRIDE
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{
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return m_prev(ostr) << m_value;
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}
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private:
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// Data members
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PrevType const& m_prev;
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StorageT m_value;
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};
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//____________________________________________________________________________//
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template<typename T>
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inline lazy_ostream_impl<lazy_ostream,T>
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operator<<( lazy_ostream const& prev, T const& v )
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{
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return lazy_ostream_impl<lazy_ostream,T>( prev, v );
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}
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//____________________________________________________________________________//
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template<typename PrevPrevType, typename TPrev, typename T>
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inline lazy_ostream_impl<lazy_ostream_impl<PrevPrevType,TPrev>,T>
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operator<<( lazy_ostream_impl<PrevPrevType,TPrev> const& prev, T const& v )
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{
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typedef lazy_ostream_impl<PrevPrevType,TPrev> PrevType;
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return lazy_ostream_impl<PrevType,T>( prev, v );
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}
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//____________________________________________________________________________//
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#if BOOST_TEST_USE_STD_LOCALE
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template<typename R,typename S>
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inline lazy_ostream_impl<lazy_ostream,R& (BOOST_TEST_CALL_DECL *)(S&),R& (BOOST_TEST_CALL_DECL *)(S&)>
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operator<<( lazy_ostream const& prev, R& (BOOST_TEST_CALL_DECL *man)(S&) )
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{
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typedef R& (BOOST_TEST_CALL_DECL * ManipType)(S&);
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return lazy_ostream_impl<lazy_ostream,ManipType,ManipType>( prev, man );
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}
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//____________________________________________________________________________//
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template<typename PrevPrevType, typename TPrev,typename R,typename S>
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inline lazy_ostream_impl<lazy_ostream_impl<PrevPrevType,TPrev>,R& (BOOST_TEST_CALL_DECL *)(S&),R& (BOOST_TEST_CALL_DECL *)(S&)>
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operator<<( lazy_ostream_impl<PrevPrevType,TPrev> const& prev, R& (BOOST_TEST_CALL_DECL *man)(S&) )
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{
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typedef R& (BOOST_TEST_CALL_DECL * ManipType)(S&);
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return lazy_ostream_impl<lazy_ostream_impl<PrevPrevType,TPrev>,ManipType,ManipType>( prev, man );
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}
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//____________________________________________________________________________//
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#endif
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#define BOOST_TEST_LAZY_MSG( M ) (::boost::unit_test::lazy_ostream::instance() << M)
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} // namespace unit_test
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} // namespace boost
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#include <boost/test/detail/enable_warnings.hpp>
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#endif // BOOST_TEST_UTILS_LAZY_OSTREAM_HPP
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