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151 lines
3.5 KiB
C++
151 lines
3.5 KiB
C++
//
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// VarIterator.h
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//
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// Library: Foundation
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// Package: Dynamic
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// Module: VarIterator
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//
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// Definition of the VarIterator class.
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//
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// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_VarIterator_INCLUDED
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#define Foundation_VarIterator_INCLUDED
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#include "Poco/Exception.h"
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#include <iterator>
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#include <algorithm>
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namespace Poco {
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namespace Dynamic {
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class Var;
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class Foundation_API VarIterator
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/// VarIterator class.
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{
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public:
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typedef std::bidirectional_iterator_tag iterator_category;
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typedef Var value_type;
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typedef std::ptrdiff_t difference_type;
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typedef Var* pointer;
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typedef Var& reference;
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static const std::size_t POSITION_END;
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/// End position indicator.
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VarIterator(Var* pVar, bool positionEnd);
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/// Creates the VarIterator and positions it at the end of
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/// the recordset if positionEnd is true. Otherwise, it is
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/// positioned at the beginning.
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VarIterator(const VarIterator& other);
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/// Creates a copy of other VarIterator.
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~VarIterator();
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/// Destroys the VarIterator.
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VarIterator& operator = (const VarIterator& other);
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/// Assigns the other VarIterator.
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bool operator == (const VarIterator& other) const;
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/// Equality operator.
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bool operator != (const VarIterator& other) const;
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/// Inequality operator.
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Var& operator * () const;
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/// Returns value at the current position.
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Var* operator -> () const;
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/// Returns pointer to the value at current position.
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const VarIterator& operator ++ () const;
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/// Advances by one position and returns current position.
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VarIterator operator ++ (int) const;
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/// Advances by one position and returns copy of the iterator with
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/// previous current position.
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const VarIterator& operator -- () const;
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/// Goes back by one position and returns copy of the iterator with
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/// previous current position.
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VarIterator operator -- (int) const;
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/// Goes back by one position and returns previous current position.
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VarIterator operator + (std::size_t diff) const;
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/// Returns a copy the VarIterator advanced by diff positions.
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VarIterator operator - (std::size_t diff) const;
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/// Returns a copy the VarIterator backed by diff positions.
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/// Throws RangeException if diff is larger than current position.
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void swap(VarIterator& other);
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/// Swaps the VarIterator with another one.
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private:
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VarIterator();
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void increment() const;
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/// Increments the iterator position by one.
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/// Throws RangeException if position is out of range.
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void decrement() const;
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/// Decrements the iterator position by one.
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/// Throws RangeException if position is out of range.
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void setPosition(std::size_t pos) const;
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/// Sets the iterator position.
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/// Throws RangeException if position is out of range.
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Var* _pVar;
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mutable std::size_t _position;
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friend class Var;
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};
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///
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/// inlines
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///
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inline bool VarIterator::operator == (const VarIterator& other) const
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{
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return _pVar == other._pVar && _position == other._position;
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}
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inline bool VarIterator::operator != (const VarIterator& other) const
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{
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return _pVar != other._pVar || _position != other._position;
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}
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} } // namespace Poco::Dynamic
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namespace std
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{
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template<>
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inline void swap<Poco::Dynamic::VarIterator>(Poco::Dynamic::VarIterator& s1,
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Poco::Dynamic::VarIterator& s2)
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/// Full template specialization of std:::swap for VarIterator
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{
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s1.swap(s2);
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}
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}
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#endif // Foundation_VarIterator_INCLUDED
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