mirror of
https://github.com/pocoproject/poco.git
synced 2025-10-28 11:31:53 +01:00
154 lines
3.6 KiB
C++
154 lines
3.6 KiB
C++
//
|
|
// VarIterator.h
|
|
//
|
|
// $Id: //poco/Main/Foundation/include/Poco/Dynamic/VarIterator.h#1 $
|
|
//
|
|
// Library: Foundation
|
|
// Package: Dynamic
|
|
// Module: VarIterator
|
|
//
|
|
// Definition of the VarIterator class.
|
|
//
|
|
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Foundation_VarIterator_INCLUDED
|
|
#define Foundation_VarIterator_INCLUDED
|
|
|
|
|
|
#include "Poco/Exception.h"
|
|
#include <iterator>
|
|
#include <algorithm>
|
|
|
|
|
|
namespace Poco {
|
|
namespace Dynamic {
|
|
|
|
|
|
class Var;
|
|
|
|
|
|
class Foundation_API VarIterator
|
|
/// VarIterator class.
|
|
{
|
|
public:
|
|
typedef std::bidirectional_iterator_tag iterator_category;
|
|
typedef Var value_type;
|
|
typedef std::ptrdiff_t difference_type;
|
|
typedef Var* pointer;
|
|
typedef Var& reference;
|
|
|
|
static const std::size_t POSITION_END;
|
|
/// End position indicator.
|
|
|
|
VarIterator(Var* pVar, bool positionEnd);
|
|
/// Creates the VarIterator and positions it at the end of
|
|
/// the recordset if positionEnd is true. Otherwise, it is
|
|
/// positioned at the beginning.
|
|
|
|
VarIterator(const VarIterator& other);
|
|
/// Creates a copy of other VarIterator.
|
|
|
|
~VarIterator();
|
|
/// Destroys the VarIterator.
|
|
|
|
VarIterator& operator = (const VarIterator& other);
|
|
/// Assigns the other VarIterator.
|
|
|
|
bool operator == (const VarIterator& other) const;
|
|
/// Equality operator.
|
|
|
|
bool operator != (const VarIterator& other) const;
|
|
/// Inequality operator.
|
|
|
|
Var& operator * () const;
|
|
/// Returns value at the current position.
|
|
|
|
Var* operator -> () const;
|
|
/// Returns pointer to the value at current position.
|
|
|
|
const VarIterator& operator ++ () const;
|
|
/// Advances by one position and returns current position.
|
|
|
|
VarIterator operator ++ (int) const;
|
|
/// Advances by one position and returns copy of the iterator with
|
|
/// previous current position.
|
|
|
|
const VarIterator& operator -- () const;
|
|
/// Goes back by one position and returns copy of the iterator with
|
|
/// previous current position.
|
|
|
|
VarIterator operator -- (int) const;
|
|
/// Goes back by one position and returns previous current position.
|
|
|
|
VarIterator operator + (std::size_t diff) const;
|
|
/// Returns a copy the VarIterator advanced by diff positions.
|
|
|
|
VarIterator operator - (std::size_t diff) const;
|
|
/// Returns a copy the VarIterator backed by diff positions.
|
|
/// Throws RangeException if diff is larger than current position.
|
|
|
|
void swap(VarIterator& other);
|
|
/// Swaps the VarIterator with another one.
|
|
|
|
private:
|
|
VarIterator();
|
|
|
|
void increment() const;
|
|
/// Increments the iterator position by one.
|
|
/// Throws RangeException if position is out of range.
|
|
|
|
void decrement() const;
|
|
/// Decrements the iterator position by one.
|
|
/// Throws RangeException if position is out of range.
|
|
|
|
void setPosition(std::size_t pos) const;
|
|
/// Sets the iterator position.
|
|
/// Throws RangeException if position is out of range.
|
|
|
|
Var* _pVar;
|
|
mutable std::size_t _position;
|
|
|
|
friend class Var;
|
|
};
|
|
|
|
|
|
///
|
|
/// inlines
|
|
///
|
|
|
|
|
|
inline bool VarIterator::operator == (const VarIterator& other) const
|
|
{
|
|
return _pVar == other._pVar && _position == other._position;
|
|
}
|
|
|
|
|
|
inline bool VarIterator::operator != (const VarIterator& other) const
|
|
{
|
|
return _pVar != other._pVar || _position != other._position;
|
|
}
|
|
|
|
|
|
} } // namespace Poco::Dynamic
|
|
|
|
|
|
namespace std
|
|
{
|
|
using std::swap;
|
|
template<>
|
|
inline void swap<Poco::Dynamic::VarIterator>(Poco::Dynamic::VarIterator& s1,
|
|
Poco::Dynamic::VarIterator& s2)
|
|
/// Full template specialization of std:::swap for VarIterator
|
|
{
|
|
s1.swap(s2);
|
|
}
|
|
}
|
|
|
|
|
|
#endif // Foundation_VarIterator_INCLUDED
|