less_equal.hpp

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//
// Created by YongGyu Lee on 2024/02/04.
//
 
#ifndef VCCC_FUNCTIONAL_LESS_EQUAL_HPP
#define VCCC_FUNCTIONAL_LESS_EQUAL_HPP
 
#include <type_traits>
#include <utility>
 
#include "vccc/__concepts/totally_ordered.hpp"
#include "vccc/__functional/less.hpp"
 
namespace vccc {
namespace ranges {
 
 
struct less_equal {
  using is_transparent = std::true_type;
 
  template<typename T, typename U, std::enable_if_t<totally_ordered_with<T, U>::value, int> = 0>
  constexpr bool operator()(T&& t, U&& u) const
      noexcept(noexcept(!ranges::less{}(std::forward<U>(u), std::forward<T>(t))))
  {
    return !ranges::less{}(std::forward<U>(u), std::forward<T>(t));
  }
};
 
 
} // namespace ranges
} // namespace vccc
 
#endif // VCCC_FUNCTIONAL_LESS_EQUAL_HPP