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/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <iterator>
namespace WTF {
// Weaker form of std::ranges::range that does not require full compliance with std::ranges iterator concepts.
template<typename T> concept Container = requires(T container) {
container.begin();
container.end();
};
// Weaker form of std::ranges::sized_range that does not require full compliance with std::ranges iterator concepts.
template<typename T> concept SizedContainer = Container<T> && requires(T container) {
container.size();
};
template<typename Iterator>
class IteratorRange {
WTF_DEPRECATED_MAKE_FAST_ALLOCATED(IteratorRange);
public:
using reverse_iterator = std::reverse_iterator<Iterator>;
IteratorRange(Iterator begin, Iterator end)
: m_begin(WTFMove(begin))
, m_end(WTFMove(end))
{
}
auto begin() const { return m_begin; }
auto end() const { return m_end; }
auto rbegin() const { return reverse_iterator { m_end }; }
auto rend() const { return reverse_iterator { m_begin }; }
private:
Iterator m_begin;
Iterator m_end;
};
template<typename Container, typename Iterator>
class SizedIteratorRange {
WTF_DEPRECATED_MAKE_FAST_ALLOCATED(SizedIteratorRange);
public:
SizedIteratorRange(const Container& container, Iterator begin, Iterator end)
: m_container(container)
, m_begin(WTFMove(begin))
, m_end(WTFMove(end))
{
}
auto size() const -> decltype(std::declval<Container>().size()) { return m_container.size(); }
bool isEmpty() const { return m_container.isEmpty(); }
Iterator begin() const { return m_begin; }
Iterator end() const { return m_end; }
private:
const Container& m_container;
Iterator m_begin;
Iterator m_end;
};
template<typename Iterator>
IteratorRange<Iterator> makeIteratorRange(Iterator&& begin, Iterator&& end)
{
return IteratorRange<Iterator>(std::forward<Iterator>(begin), std::forward<Iterator>(end));
}
template<SizedContainer Container, typename Iterator>
SizedIteratorRange<Container, Iterator> makeSizedIteratorRange(const Container& container, Iterator&& begin, Iterator&& end)
{
return SizedIteratorRange<Container, Iterator>(container, std::forward<Iterator>(begin), std::forward<Iterator>(end));
}
template<typename Container>
IteratorRange<typename Container::reverse_iterator> makeReversedRange(Container& container)
{
return makeIteratorRange(std::rbegin(container), std::rend(container));
}
template<typename Container>
IteratorRange<typename Container::const_reverse_iterator> makeReversedRange(const Container& container)
{
return makeIteratorRange(std::crbegin(container), std::crend(container));
}
template<SizedContainer Container>
SizedIteratorRange<Container, typename Container::reverse_iterator> makeReversedRange(Container& container)
{
return makeSizedIteratorRange(container, std::rbegin(container), std::rend(container));
}
template<SizedContainer Container>
SizedIteratorRange<Container, typename Container::const_reverse_iterator> makeReversedRange(const Container& container)
{
return makeSizedIteratorRange(container, std::crbegin(container), std::crend(container));
}
} // namespace WTF
using WTF::IteratorRange;
using WTF::makeReversedRange;
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