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170 lines
2.8 KiB
C++
170 lines
2.8 KiB
C++
//
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// VarIterator.cpp
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//
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// $Id: //poco/Main/Data/src/VarIterator.cpp#1 $
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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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// 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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#include "Poco/Dynamic/VarIterator.h"
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#include "Poco/Dynamic/Var.h"
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#include "Poco/Dynamic/Struct.h"
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#undef min
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#undef max
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#include <limits>
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namespace Poco {
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namespace Dynamic {
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const std::size_t VarIterator::POSITION_END = std::numeric_limits<std::size_t>::max();
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VarIterator::VarIterator(Var* pVar, bool positionEnd):
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_pVar(pVar),
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_position(positionEnd ? POSITION_END : 0)
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{
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}
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VarIterator::VarIterator(const VarIterator& other):
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_pVar(other._pVar),
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_position(other._position)
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{
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}
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VarIterator::~VarIterator()
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{
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}
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VarIterator& VarIterator::operator = (const VarIterator& other)
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{
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VarIterator tmp(other);
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swap(tmp);
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return *this;
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}
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void VarIterator::swap(VarIterator& other)
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{
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using std::swap;
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swap(_pVar, other._pVar);
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swap(_position, other._position);
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}
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void VarIterator::increment() const
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{
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if (POSITION_END == _position)
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throw RangeException("End of iterator reached.");
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if (_position < _pVar->size() - 1)
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++_position;
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else
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_position = POSITION_END;
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}
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void VarIterator::decrement() const
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{
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if (0 == _position)
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throw RangeException("Beginning of iterator reached.");
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else if (POSITION_END == _position)
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_position = _pVar->size() - 1;
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else
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--_position;
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}
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void VarIterator::setPosition(std::size_t pos) const
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{
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if (_position == pos) return;
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if (pos < _pVar->size())
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_position = pos;
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else if (pos == _pVar->size())
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_position = POSITION_END;
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else
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throw RangeException("Invalid position argument.");
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}
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Var& VarIterator::operator * () const
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{
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if (POSITION_END == _position)
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throw InvalidAccessException("End of iterator reached.");
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return _pVar->operator[](_position);
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}
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Var* VarIterator::operator -> () const
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{
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if (POSITION_END == _position)
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throw InvalidAccessException("End of iterator reached.");
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return &_pVar->operator[](_position);
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}
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const VarIterator& VarIterator::operator ++ () const
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{
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increment();
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return *this;
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}
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VarIterator VarIterator::operator ++ (int) const
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{
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VarIterator old(*this);
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increment();
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return old;
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}
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const VarIterator& VarIterator::operator -- () const
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{
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decrement();
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return *this;
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}
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VarIterator VarIterator::operator -- (int) const
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{
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VarIterator old(*this);
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decrement();
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return old;
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}
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VarIterator VarIterator::operator + (std::size_t diff) const
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{
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VarIterator ri(*this);
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ri.setPosition(_position + diff);
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return ri;
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}
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VarIterator VarIterator::operator - (std::size_t diff) const
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{
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if (diff > _position) throw RangeException("Invalid position argument.");
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VarIterator ri(*this);
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ri.setPosition(_position - diff);
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return ri;
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}
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} } // namespace Poco::Dynamic
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