103 lines
2.7 KiB
C++
103 lines
2.7 KiB
C++
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#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)
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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/mpl/eval_if.hpp>
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#include <boost/mpl/if.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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