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/*
* Copyright (c) 2020, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Forward.h>
namespace AK {
template<typename Container, typename ValueType>
class SimpleIterator {
public:
friend Container;
constexpr bool is_end() const { return m_index == SimpleIterator::end(m_container).m_index; }
constexpr size_t index() const { return m_index; }
constexpr bool operator==(SimpleIterator other) const { return m_index == other.m_index; }
constexpr bool operator!=(SimpleIterator other) const { return m_index != other.m_index; }
constexpr bool operator<(SimpleIterator other) const { return m_index < other.m_index; }
constexpr bool operator>(SimpleIterator other) const { return m_index > other.m_index; }
constexpr bool operator<=(SimpleIterator other) const { return m_index <= other.m_index; }
constexpr bool operator>=(SimpleIterator other) const { return m_index >= other.m_index; }
constexpr SimpleIterator operator+(ptrdiff_t delta) const { return SimpleIterator { m_container, m_index + delta }; }
constexpr SimpleIterator operator-(ptrdiff_t delta) const { return SimpleIterator { m_container, m_index - delta }; }
constexpr ptrdiff_t operator-(SimpleIterator other) const { return static_cast<ptrdiff_t>(m_index) - other.m_index; }
constexpr SimpleIterator operator++()
{
++m_index;
return *this;
}
constexpr SimpleIterator operator++(int)
{
++m_index;
return SimpleIterator { m_container, m_index - 1 };
}
constexpr SimpleIterator operator--()
{
--m_index;
return *this;
}
constexpr SimpleIterator operator--(int)
{
--m_index;
return SimpleIterator { m_container, m_index + 1 };
}
ALWAYS_INLINE constexpr ValueType const& operator*() const { return m_container[m_index]; }
ALWAYS_INLINE constexpr ValueType& operator*() { return m_container[m_index]; }
ALWAYS_INLINE constexpr ValueType const* operator->() const { return &m_container[m_index]; }
ALWAYS_INLINE constexpr ValueType* operator->() { return &m_container[m_index]; }
SimpleIterator& operator=(SimpleIterator const& other)
{
m_index = other.m_index;
return *this;
}
SimpleIterator(SimpleIterator const& obj) = default;
private:
static constexpr SimpleIterator begin(Container& container) { return { container, 0 }; }
static constexpr SimpleIterator end(Container& container)
{
using RawContainerType = RemoveCV<Container>;
if constexpr (IsSame<StringView, RawContainerType> || IsSame<String, RawContainerType>)
return { container, container.length() };
else
return { container, container.size() };
}
constexpr SimpleIterator(Container& container, size_t index)
: m_container(container)
, m_index(index)
{
}
Container& m_container;
size_t m_index;
};
}
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