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RowIterator.h
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RowIterator.h
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/**
*
* RowIterator.h
* An Tao
*
* Copyright 2018, An Tao. All rights reserved.
* https://github.com/an-tao/drogon
* Use of this source code is governed by a MIT license
* that can be found in the License file.
*
* Drogon
*
*/
// Taken from libpqxx and modified.
// The license for libpqxx can be found in the COPYING file.
#pragma once
#include <drogon/orm/Field.h>
#include <drogon/orm/Row.h>
namespace drogon
{
namespace orm
{
class ConstRowIterator : protected Field
{
public:
using pointer = const Field *;
using reference = const Field &;
using value_type = const Field;
using size_type = Row::SizeType;
using difference_type = Row::DifferenceType;
using iterator_category = std::random_access_iterator_tag;
// ConstRowIterator(const Field &t) noexcept : Field(t) {}
pointer operator->()
{
return this;
}
reference operator*()
{
return *this;
}
ConstRowIterator operator++(int);
ConstRowIterator &operator++()
{
++column_;
return *this;
}
ConstRowIterator operator--(int);
ConstRowIterator &operator--()
{
--column_;
return *this;
}
ConstRowIterator &operator+=(difference_type i)
{
column_ += i;
return *this;
}
ConstRowIterator &operator-=(difference_type i)
{
column_ -= i;
return *this;
}
bool operator==(const ConstRowIterator &other) const
{
return column_ == other.column_;
}
bool operator!=(const ConstRowIterator &other) const
{
return column_ != other.column_;
}
bool operator>(const ConstRowIterator &other) const
{
return column_ > other.column_;
}
bool operator<(const ConstRowIterator &other) const
{
return column_ < other.column_;
}
bool operator>=(const ConstRowIterator &other) const
{
return column_ >= other.column_;
}
bool operator<=(const ConstRowIterator &other) const
{
return column_ <= other.column_;
}
private:
friend class Row;
ConstRowIterator(const Row &r, SizeType column) noexcept : Field(r, column)
{
}
};
class ConstReverseRowIterator : private ConstRowIterator
{
public:
using super = ConstRowIterator;
using iterator_type = ConstRowIterator;
using iterator_type::difference_type;
using iterator_type::iterator_category;
using iterator_type::pointer;
using iterator_type::reference;
// using iterator_type::value_type;
ConstReverseRowIterator(const ConstReverseRowIterator &rhs)
: ConstRowIterator(rhs)
{
}
explicit ConstReverseRowIterator(const ConstRowIterator &rhs)
: ConstRowIterator(rhs)
{
super::operator--();
}
ConstRowIterator base() const noexcept;
using iterator_type::operator->;
using iterator_type::operator*;
ConstReverseRowIterator operator++(int);
ConstReverseRowIterator &operator++()
{
iterator_type::operator--();
return *this;
}
ConstReverseRowIterator operator--(int);
ConstReverseRowIterator &operator--()
{
iterator_type::operator++();
return *this;
}
ConstReverseRowIterator &operator+=(difference_type i)
{
iterator_type::operator-=(i);
return *this;
}
ConstReverseRowIterator &operator-=(difference_type i)
{
iterator_type::operator+=(i);
return *this;
}
bool operator==(const ConstReverseRowIterator &other) const
{
return column_ == other.column_;
}
bool operator!=(const ConstReverseRowIterator &other) const
{
return column_ != other.column_;
}
bool operator>(const ConstReverseRowIterator &other) const
{
return column_ < other.column_;
}
bool operator<(const ConstReverseRowIterator &other) const
{
return column_ > other.column_;
}
bool operator>=(const ConstReverseRowIterator &other) const
{
return column_ <= other.column_;
}
bool operator<=(const ConstReverseRowIterator &other) const
{
return column_ >= other.column_;
}
};
} // namespace orm
} // namespace drogon