cbegin.hpp

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//
// Created by yonggyulee on 2023/12/24.
//
 
#ifndef VCCC_RANGES_CBEGIN_HPP_
#define VCCC_RANGES_CBEGIN_HPP_
 
#include <type_traits>
 
#include "vccc/__core/inline_or_static.hpp"
#include "vccc/__iterator/basic_const_iterator.hpp"
#include "vccc/__ranges/begin.hpp"
#include "vccc/__ranges/enable_borrowed_range.hpp"
#include "vccc/__ranges/possibly_const_range.hpp"
#include "vccc/__type_traits/disjunction.hpp"
 
namespace vccc {
namespace ranges {
namespace detail {
 
struct cbegin_niebloid {
  template<typename T, std::enable_if_t<disjunction<
      std::is_lvalue_reference<T>,
      enable_borrowed_range<std::remove_cv_t<T>>
  >::value, int> = 0>
  constexpr auto operator()(T&& t) const {
    return vccc::const_iterator<decltype(ranges::begin(vccc::ranges::possibly_const_range(t)))>(ranges::begin(vccc::ranges::possibly_const_range(t)));
  }
};
 
} // namespace detail
 
namespace niebloid {
 
 
VCCC_INLINE_OR_STATIC constexpr detail::cbegin_niebloid cbegin{};
 
 
} // namespace niebloid
using namespace niebloid;
 
} // namespace ranges
} // namespace vccc
 
#endif // VCCC_RANGES_CBEGIN_HPP_