#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 |