106 lines
3.2 KiB
Plaintext
106 lines
3.2 KiB
Plaintext
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// (C) Copyright Gennadiy Rozental 2001.
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// Distributed under the Boost Software License, Version 1.0.
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// (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/libs/test for the library home page.
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//
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//!@file
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//! Input iterator facade
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// ***************************************************************************
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#ifndef BOOST_TEST_UTILS_INPUT_ITERATOR_FACADE_HPP
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#define BOOST_TEST_UTILS_INPUT_ITERATOR_FACADE_HPP
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// Boost
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#include <boost/iterator/iterator_facade.hpp>
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#include <boost/test/detail/suppress_warnings.hpp>
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//____________________________________________________________________________//
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namespace boost {
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namespace unit_test {
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namespace utils {
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// ************************************************************************** //
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// ************** input_iterator_core_access ************** //
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// ************************************************************************** //
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class input_iterator_core_access
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{
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#if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS) || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
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public:
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#else
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template <class I, class V, class R, class TC> friend class input_iterator_facade;
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#endif
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template <class Facade>
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static bool get( Facade& f )
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{
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return f.get();
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}
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private:
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// objects of this class are useless
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input_iterator_core_access(); //undefined
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};
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// ************************************************************************** //
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// ************** input_iterator_facade ************** //
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// ************************************************************************** //
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template<typename Derived,
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typename ValueType,
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typename Reference = ValueType const&,
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typename Traversal = single_pass_traversal_tag>
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class input_iterator_facade : public iterator_facade<Derived,ValueType,Traversal,Reference>
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{
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public:
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// Constructor
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input_iterator_facade() : m_valid( false ), m_value() {}
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protected: // provide access to the Derived
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void init()
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{
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m_valid = true;
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increment();
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}
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// Data members
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mutable bool m_valid;
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ValueType m_value;
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private:
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friend class boost::iterator_core_access;
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// iterator facade interface implementation
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void increment()
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{
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// we make post-end incrementation indefinetly safe
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if( m_valid )
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m_valid = input_iterator_core_access::get( *static_cast<Derived*>(this) );
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}
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Reference dereference() const
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{
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return m_value;
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}
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// iterator facade interface implementation
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bool equal( input_iterator_facade const& rhs ) const
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{
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// two invalid iterator equals, inequal otherwise
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return !m_valid && !rhs.m_valid;
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}
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};
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} // namespace utils
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} // namespace unit_test
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} // namespace boost
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//____________________________________________________________________________//
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#include <boost/test/detail/enable_warnings.hpp>
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#endif // BOOST_TEST_UTILS_INPUT_ITERATOR_FACADE_HPP
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