#pragma once

#include <iterator>

namespace stdx {

inline namespace v1 {

#if __cplusplus < 202002L

// NOLINTBEGIN(bugprone-macro-parentheses, cppcoreguidelines-macro-usage)

#define DETECTOR(name, expr) \

namespace detail::detect { \

template <typename T, typename = void> constexpr auto name = false; \

template <typename T> \

constexpr auto name<T, std::void_t<decltype(expr)>> = true; \

}

// NOLINTEND(bugprone-macro-parentheses, cppcoreguidelines-macro-usage)

DETECTOR(range_begin, (std::begin(std::declval<T &>())))

DETECTOR(range_end, (std::end(std::declval<T &>())))

template <typename T>

constexpr auto range =

detail::detect::range_begin<T> and detail::detect::range_end<T>;

#undef DETECTOR

#else

template <typename T>

concept range = requires(T &t) {

std::begin(t);

std::end(t);

};

#endif

} // namespace v1

} // namespace stdx