#ifndef BOOST_ARCHIVE_ITERATORS_DATAFLOW_HPP #define BOOST_ARCHIVE_ITERATORS_DATAFLOW_HPP // MS compatible compilers support #pragma once #if defined(_MSC_VER) && (_MSC_VER >= 1020) # pragma once #endif /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 // dataflow.hpp // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . // Use, modification and distribution is subject to 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 for updates, documentation, and revision history. #include <cassert> #include <boost/config.hpp> // for BOOST_DEDUCED_TYPENAME #include <boost/mpl/eval_if.hpp> #include <boost/mpl/if.hpp> #include <boost/mpl/bool.hpp> #include <boost/mpl/apply.hpp> #include <boost/mpl/plus.hpp> #include <boost/mpl/int.hpp> #include <boost/type_traits/is_convertible.hpp> #include <boost/type_traits/is_base_and_derived.hpp> #include <boost/type_traits/is_pointer.hpp> #include <boost/iterator/iterator_adaptor.hpp> #include <boost/iterator/iterator_traits.hpp> #include <boost/static_assert.hpp> namespace boost { namespace archive { namespace iterators { // poor man's tri-state struct tri_state { enum state_enum { is_false = false, is_true = true, is_indeterminant } m_state; // convert to bool operator bool (){ assert(is_indeterminant != m_state); return is_true == m_state ? true : false; } // assign from bool tri_state & operator=(bool rhs) { m_state = rhs ? is_true : is_false; return *this; } tri_state(bool rhs) : m_state(rhs ? is_true : is_false) {} tri_state(state_enum state) : m_state(state) {} bool operator==(const tri_state & rhs) const { return m_state == rhs.m_state; } bool operator!=(const tri_state & rhs) const { return m_state != rhs.m_state; } }; /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 // implement functions common to dataflow iterators template<class Derived> class dataflow { bool m_eoi; protected: // test for iterator equality tri_state equal(const Derived & rhs) const { if(m_eoi && rhs.m_eoi) return true; if(m_eoi || rhs.m_eoi) return false; return tri_state(tri_state::is_indeterminant); } void eoi(bool tf){ m_eoi = tf; } bool eoi() const { return m_eoi; } public: dataflow(bool tf) : m_eoi(tf) {} dataflow() : // used for iterator end m_eoi(true) {} }; } // namespace iterators } // namespace archive } // namespace boost #endif // BOOST_ARCHIVE_ITERATORS_DATAFLOW_HPP