clamp.hpp

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//
// Created by YongGyu Lee on 5/8/24.
//
 
#ifndef VCCC_ALGORITHM_RANGES_CLAMP_HPP_
#define VCCC_ALGORITHM_RANGES_CLAMP_HPP_
 
#include <utility>
 
#include "vccc/__core/inline_or_static.hpp"
#include "vccc/__functional/identity.hpp"
#include "vccc/__functional/invoke.hpp"
#include "vccc/__functional/less.hpp"
#include "vccc/__iterator/indirect_strict_weak_order.hpp"
#include "vccc/__iterator/projected.hpp"
#include "vccc/__type_traits/conjunction.hpp"
 
namespace vccc {
namespace ranges {
namespace detail {
 
struct clamp_niebloid {
  template<typename T, typename Proj = identity, typename Comp = ranges::less, std::enable_if_t<conjunction<
      projectable<const T*, Proj>,
      indirect_strict_weak_order<Comp, projected<const T*, Proj>>
      >::value, int> = 0>
  constexpr const T& operator()(const T& v, const T& lo, const T& hi, Comp comp = {}, Proj proj = {}) const {
    auto&& pv = vccc::invoke(proj, v);
 
    if (vccc::invoke(comp, std::forward<decltype(pv)>(pv), vccc::invoke(proj, lo)))
      return lo;
 
    if (vccc::invoke(comp, vccc::invoke(proj, hi), std::forward<decltype(pv)>(pv)))
      return hi;
 
    return v;
  }
};
 
} // namespace detail
 
 
VCCC_INLINE_OR_STATIC constexpr detail::clamp_niebloid clamp{};
 
 
} // namespace ranges
} // namespace vccc
 
#endif // VCCC_ALGORITHM_RANGES_CLAMP_HPP_