integer_range.hpp

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#ifndef EAGINE_INTEGER_RANGE_HPP
#define EAGINE_INTEGER_RANGE_HPP
 
#include "iterator.hpp"
 
namespace eagine {
 
template <typename T>
class integer_range {
public:
    constexpr integer_range() noexcept = default;
 
    constexpr integer_range(T e) noexcept
      : _end{e} {}
 
    constexpr integer_range(T b, T e) noexcept
      : _begin{b}
      , _end{e} {}
 
    using iterator = selfref_iterator<T>;
 
    using size_type = decltype(std::declval<T>() - std::declval<T>());
 
    constexpr auto empty() const noexcept {
        return _end == _begin;
    }
 
    constexpr auto size() const noexcept {
        return _end - _begin;
    }
 
    constexpr auto begin() const noexcept -> iterator {
        return {_begin};
    }
 
    constexpr auto end() const noexcept -> iterator {
        return {_end};
    }
 
private:
    T _begin{0};
    T _end{0};
};
 
template <typename B, typename E>
integer_range(B, E) -> integer_range<std::common_type_t<B, E>>;
 
} // namespace eagine
 
#endif // EAGINE_INTEGER_RANGE_HPP