Initial work for G-code sender and more intensive usage of Boost

xs/include/boost/test/utils/lazy_ostream.hpp

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+//  (C) Copyright Gennadiy Rozental 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: 49312 $
+//
+//  Description : contains definition for all test tools in test toolbox
+// ***************************************************************************
+
+#ifndef BOOST_TEST_LAZY_OSTREAM_HPP_070708GER
+#define BOOST_TEST_LAZY_OSTREAM_HPP_070708GER
+
+// 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:
+    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 empty = true ) : m_empty( empty )    {}
+
+    // protected destructor to make sure right one is called
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582))
+public:
+#endif
+    BOOST_TEST_PROTECTED_VIRTUAL ~lazy_ostream()                                    {}
+
+private:
+    // Data members
+    bool                    m_empty;
+};
+
+//____________________________________________________________________________//
+
+template<typename T>
+class lazy_ostream_impl : public lazy_ostream {
+public:
+    lazy_ostream_impl( lazy_ostream const& prev, T value )
+    : lazy_ostream( false )
+    , m_prev( prev )
+    , m_value( value )
+    {}
+private:
+    virtual std::ostream&   operator()( std::ostream& ostr ) const
+    {
+        return m_prev(ostr) << m_value;
+    }
+
+    // Data members
+    lazy_ostream const&     m_prev;
+    T                       m_value;
+};
+
+//____________________________________________________________________________//
+
+template<typename T>
+inline lazy_ostream_impl<T const&>
+operator<<( lazy_ostream const& prev, T const& v )
+{
+    return lazy_ostream_impl<T const&>( prev, v );
+}
+
+//____________________________________________________________________________//
+
+#if BOOST_TEST_USE_STD_LOCALE
+
+template<typename R,typename S>
+inline lazy_ostream_impl<R& (BOOST_TEST_CALL_DECL *)(S&)>
+operator<<( lazy_ostream const& prev, R& (BOOST_TEST_CALL_DECL *man)(S&) )
+{
+    return lazy_ostream_impl<R& (BOOST_TEST_CALL_DECL *)(S&)>( prev, man );
+}
+
+//____________________________________________________________________________//
+
+#endif
+
+} // namespace unit_test
+
+} // namespace boost
+
+//____________________________________________________________________________//
+
+#include <boost/test/detail/enable_warnings.hpp>
+
+#endif // BOOST_TEST_LAZY_OSTREAM_HPP_070708GER