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#pragma once
#include <concepts>
#include <iterator>
template <std::weakly_incrementable Value>
class IotaViewIterator
{
public:
constexpr explicit IotaViewIterator(Value value) noexcept;
constexpr auto operator++() noexcept -> const IotaViewIterator &;
constexpr auto operator++(int) noexcept -> IotaViewIterator;
constexpr auto operator*() const noexcept -> Value;
constexpr auto operator==(const IotaViewIterator &rhs) const noexcept -> bool;
constexpr auto operator!=(const IotaViewIterator &rhs) const noexcept -> bool;
private:
Value _value;
};
/**
* A range factory that generates a sequence of elements by repeatedly incrementing an
* initial value.
*
* This class was created because C++20 ranges is a complete shitshow in Clang.
* https://github.com/llvm/llvm-project/issues/52696
*/
template <std::weakly_incrementable Value, std::semiregular Bound>
requires std::equality_comparable_with<Value, Bound> && std::copyable<Value>
class IotaView
{
public:
constexpr IotaView(Value value, Bound bound) noexcept;
[[nodiscard]] constexpr auto begin() const noexcept -> IotaViewIterator<Value>;
[[nodiscard]] constexpr auto end() const noexcept -> IotaViewIterator<Value>;
private:
Value _value;
Bound _bound;
};
#include "ranges_impl.hpp"
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