| #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 <boost/assert.hpp> |
| |
| #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 (){ |
| BOOST_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 |