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// (C) Copyright Gennadiy Rozental 2001.
// 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.
//
// Description : contains definition for all test tools in test toolbox
// ***************************************************************************
#ifndef BOOST_TEST_UTILS_LAZY_OSTREAM_HPP
#define BOOST_TEST_UTILS_LAZY_OSTREAM_HPP
// Boost.Test
#include <boost/test/detail/config.hpp>
// STL
#include <iosfwd>
#include <boost/test/detail/suppress_warnings.hpp>
//____________________________________________________________________________//
// ************************************************************************** //
// ************** lazy_ostream ************** //
// ************************************************************************** //
namespace boost {
namespace unit_test {
class lazy_ostream {
public:
virtual ~lazy_ostream() {}
static lazy_ostream& instance() { static lazy_ostream inst; return inst; }
friend std::ostream& operator<<( std::ostream& ostr, lazy_ostream const& o ) { return o( ostr ); }
// access method
bool empty() const { return m_empty; }
// actual printing interface; to be accessed only by this class and children
virtual std::ostream& operator()( std::ostream& ostr ) const { return ostr; }
protected:
explicit lazy_ostream( bool p_empty = true ) : m_empty( p_empty ) {}
private:
// Data members
bool m_empty;
};
//____________________________________________________________________________//
template<typename PrevType, typename T, typename StorageT=T const&>
class lazy_ostream_impl : public lazy_ostream {
public:
lazy_ostream_impl( PrevType const& prev, T const& value )
: lazy_ostream( false )
, m_prev( prev )
, m_value( value )
{
}
virtual std::ostream& operator()( std::ostream& ostr ) const
{
return m_prev(ostr) << m_value;
}
private:
// Data members
PrevType const& m_prev;
StorageT m_value;
};
//____________________________________________________________________________//
template<typename T>
inline lazy_ostream_impl<lazy_ostream,T>
operator<<( lazy_ostream const& prev, T const& v )
{
return lazy_ostream_impl<lazy_ostream,T>( prev, v );
}
//____________________________________________________________________________//
template<typename PrevPrevType, typename TPrev, typename T>
inline lazy_ostream_impl<lazy_ostream_impl<PrevPrevType,TPrev>,T>
operator<<( lazy_ostream_impl<PrevPrevType,TPrev> const& prev, T const& v )
{
typedef lazy_ostream_impl<PrevPrevType,TPrev> PrevType;
return lazy_ostream_impl<PrevType,T>( prev, v );
}
//____________________________________________________________________________//
#if BOOST_TEST_USE_STD_LOCALE
template<typename R,typename S>
inline lazy_ostream_impl<lazy_ostream,R& (BOOST_TEST_CALL_DECL *)(S&),R& (BOOST_TEST_CALL_DECL *)(S&)>
operator<<( lazy_ostream const& prev, R& (BOOST_TEST_CALL_DECL *man)(S&) )
{
typedef R& (BOOST_TEST_CALL_DECL * ManipType)(S&);
return lazy_ostream_impl<lazy_ostream,ManipType,ManipType>( prev, man );
}
//____________________________________________________________________________//
template<typename PrevPrevType, typename TPrev,typename R,typename S>
inline lazy_ostream_impl<lazy_ostream_impl<PrevPrevType,TPrev>,R& (BOOST_TEST_CALL_DECL *)(S&),R& (BOOST_TEST_CALL_DECL *)(S&)>
operator<<( lazy_ostream_impl<PrevPrevType,TPrev> const& prev, R& (BOOST_TEST_CALL_DECL *man)(S&) )
{
typedef R& (BOOST_TEST_CALL_DECL * ManipType)(S&);
return lazy_ostream_impl<lazy_ostream_impl<PrevPrevType,TPrev>,ManipType,ManipType>( prev, man );
}
//____________________________________________________________________________//
#endif
#define BOOST_TEST_LAZY_MSG( M ) (::boost::unit_test::lazy_ostream::instance() << M)
} // namespace unit_test
} // namespace boost
#include <boost/test/detail/enable_warnings.hpp>
#endif // BOOST_TEST_UTILS_LAZY_OSTREAM_HPP
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