range_difference_t.hpp

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//
// Created by yonggyulee on 2023/12/24.
//
 
#ifndef VCCC_RANGES_RANGE_DIFFERENCE_T_HPP_
#define VCCC_RANGES_RANGE_DIFFERENCE_T_HPP_
 
#include "vccc/__iterator/iter_difference_t.hpp"
#include "vccc/__ranges/iterator_t.hpp"
#include "vccc/__type_traits/has_typename_type.hpp"
 
namespace vccc {
namespace ranges {
namespace detail {
 
template<typename I, bool = has_typename_type<iter_difference<I>>::value /* true */>
struct range_difference_impl_2 {
  using type = iter_difference_t<I>;
};
template<typename I>
struct range_difference_impl_2<I, false> {};
 
template<typename R, bool = has_typename_type<iterator<R>>::value /* true */>
struct range_difference_impl_1 : range_difference_impl_2<iterator_t<R>> {};
template<typename R>
struct range_difference_impl_1<R, false> {};
 
} // namespace ranges
 
 
template<typename R>
struct range_difference : detail::range_difference_impl_1<R> {};
 
template<typename R>
using range_difference_t = typename range_difference<R>::type;
 
 
} // namespace ranges
} // namespace vccc
 
#endif // VCCC_RANGES_RANGE_DIFFERENCE_T_HPP_