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// Copyright (c) 2022 Klemens D. Morgenstern
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_SQLITE_ROW_HPP
#define BOOST_SQLITE_ROW_HPP
#include <boost/sqlite/field.hpp>
BOOST_SQLITE_BEGIN_NAMESPACE
/** @brief Representation of a row in a database.
@ingroup reference
Is a random-access range.
All values that are obtained by view are valid until the next row is read.
*/
struct row
{
/// The size of the row
std::size_t size() const
{
return sqlite3_column_count(stm_);
}
/// Returns the field at `idx`, @throws std::out_of_range
BOOST_SQLITE_DECL
field at(std::size_t idx) const;
/// Returns the field at `idx`.
field operator[](std::size_t idx) const
{
field f;
f.stm_ = stm_;
f.col_ = static_cast<int>(idx);
return f;
}
/// Random access iterator used to iterate over the columns.
struct const_iterator
{
using difference_type = int;
using reference = field&;
using iterator_category = std::random_access_iterator_tag;
const_iterator & operator++()
{
f_.col_++;
return *this;
}
const_iterator operator++(int)
{
auto last = *this;
++(*this);
return last;
}
const_iterator & operator--()
{
f_.col_--;
return *this;
}
const_iterator operator--(int)
{
auto last = *this;
--(*this);
return last;
}
field operator[](int i) const
{
auto f = f_;
f.col_ += i;
return f;
}
const_iterator operator+(int i) const
{
auto r = *this;
r.f_.col_ += i;
return r;
}
const_iterator operator-(int i) const
{
auto r = *this;
r.f_.col_ -= i;
return r;
}
const_iterator & operator+=(int i)
{
f_.col_ += i;
return *this;
}
const_iterator & operator-=(int i)
{
f_.col_ -= i;
return *this;
}
const field & operator*() const
{
return f_;
}
const field * operator->() const
{
return &f_;
}
bool operator==(const const_iterator& other) const
{
return f_.col_ == other.f_.col_
&& f_.stm_ == other.f_.stm_;
}
bool operator!=(const const_iterator& other) const
{
return f_.col_ != other.f_.col_
|| f_.stm_ != other.f_.stm_;
}
bool operator<(const const_iterator& other) const
{
return f_.col_ < other.f_.col_
&& f_.stm_ < other.f_.stm_;
}
bool operator>(const const_iterator& other) const
{
return f_.col_ > other.f_.col_
&& f_.stm_ > other.f_.stm_;
}
const_iterator() = default;
private:
friend struct row;
field f_;
};
/// Returns the begin of the column-range.
const_iterator begin() const
{
const_iterator ci;
ci.f_.col_ = 0;
ci.f_.stm_ = stm_;
return ci;
}
/// Returns the end of the column-range.
const_iterator end() const
{
const_iterator ci;
ci.f_.col_ = sqlite3_column_count(stm_);
ci.f_.stm_ = stm_;
return ci;
}
private:
friend struct resultset;
sqlite3_stmt * stm_;
};
BOOST_SQLITE_END_NAMESPACE
#endif //BOOST_SQLITE_ROW_HPP
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