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105 lines
2.8 KiB
105 lines
2.8 KiB
#ifndef BOOST_ARCHIVE_ITERATORS_DATAFLOW_HPP |
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#define BOOST_ARCHIVE_ITERATORS_DATAFLOW_HPP |
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// MS compatible compilers support #pragma once |
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#if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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# pragma once |
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#endif |
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 |
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// dataflow.hpp |
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// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . |
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// Use, modification and distribution is subject to the Boost Software |
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// License, Version 1.0. (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 for updates, documentation, and revision history. |
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#include <boost/assert.hpp> |
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#include <boost/config.hpp> // for BOOST_DEDUCED_TYPENAME |
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#include <boost/mpl/eval_if.hpp> |
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#include <boost/mpl/if.hpp> |
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#include <boost/mpl/bool.hpp> |
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#include <boost/mpl/apply.hpp> |
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#include <boost/mpl/plus.hpp> |
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#include <boost/mpl/int.hpp> |
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#include <boost/type_traits/is_convertible.hpp> |
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#include <boost/type_traits/is_base_and_derived.hpp> |
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#include <boost/type_traits/is_pointer.hpp> |
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#include <boost/iterator/iterator_adaptor.hpp> |
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#include <boost/iterator/iterator_traits.hpp> |
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#include <boost/static_assert.hpp> |
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namespace boost { |
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namespace archive { |
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namespace iterators { |
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// poor man's tri-state |
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struct tri_state { |
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enum state_enum { |
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is_false = false, |
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is_true = true, |
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is_indeterminant |
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} m_state; |
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// convert to bool |
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operator bool (){ |
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BOOST_ASSERT(is_indeterminant != m_state); |
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return is_true == m_state ? true : false; |
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} |
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// assign from bool |
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tri_state & operator=(bool rhs) { |
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m_state = rhs ? is_true : is_false; |
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return *this; |
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} |
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tri_state(bool rhs) : |
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m_state(rhs ? is_true : is_false) |
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{} |
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tri_state(state_enum state) : |
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m_state(state) |
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{} |
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bool operator==(const tri_state & rhs) const { |
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return m_state == rhs.m_state; |
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} |
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bool operator!=(const tri_state & rhs) const { |
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return m_state != rhs.m_state; |
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} |
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}; |
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 |
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// implement functions common to dataflow iterators |
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template<class Derived> |
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class dataflow { |
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bool m_eoi; |
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protected: |
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// test for iterator equality |
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tri_state equal(const Derived & rhs) const { |
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if(m_eoi && rhs.m_eoi) |
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return true; |
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if(m_eoi || rhs.m_eoi) |
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return false; |
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return tri_state(tri_state::is_indeterminant); |
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} |
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void eoi(bool tf){ |
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m_eoi = tf; |
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} |
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bool eoi() const { |
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return m_eoi; |
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} |
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public: |
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dataflow(bool tf) : |
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m_eoi(tf) |
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{} |
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dataflow() : // used for iterator end |
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m_eoi(true) |
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{} |
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}; |
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} // namespace iterators |
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} // namespace archive |
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} // namespace boost |
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#endif // BOOST_ARCHIVE_ITERATORS_DATAFLOW_HPP
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