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 // SPDX-License-Identifier: MIT
 // Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
  
 #pragma once
  
 #include "ck_tile/core.hpp"
  
 namespace ck_tile {
  
 template <typename F, typename... Fs>
 struct composes : private composes<F>
 {
     template <typename FirstArg, typename... RestArgs>
     CK_TILE_HOST_DEVICE constexpr explicit composes(FirstArg&& firstArg, RestArgs&&... restArgs)
         : composes<F>(std::forward<FirstArg>(firstArg)), inner_(std::forward<RestArgs>(restArgs)...)
     {
     }
  
     template <typename Arg>
     CK_TILE_HOST_DEVICE constexpr auto operator()(Arg&& arg) const
     {
         return static_cast<const composes<F>&>(*this)(inner_(std::forward<Arg>(arg)));
     }
  
     private:
     composes<Fs...> inner_;
 };
  
 template <typename F>
 struct composes<F>
 {
     static_assert(!std::is_reference_v<F>);
  
     template <typename Arg, typename = std::enable_if_t<std::is_constructible_v<F, Arg>>>
     CK_TILE_HOST_DEVICE constexpr explicit composes(Arg&& arg) : f_(std::forward<Arg>(arg))
     {
     }
  
     template <typename Arg,
               typename = std::enable_if_t<std::is_invocable_v<std::add_const_t<F>&, Arg>>>
     CK_TILE_HOST_DEVICE constexpr auto operator()(Arg&& arg) const
     {
         return f_(std::forward<Arg>(arg));
     }
  
     private:
     F f_;
 };
  
 template <typename... Ts>
 __host__ __device__ composes(Ts&&...)->composes<remove_cvref_t<Ts>...>;
  
 template <typename SaturateType>
 struct saturates
 {
     // NOTE: this function does not return SaturateType value
     // it is user's responsiblity to do further cast or not
     template <typename AccType>
     CK_TILE_HOST_DEVICE constexpr auto operator()(const AccType& a_) const
         -> std::enable_if_t<std::is_arithmetic_v<AccType>, AccType>
     {
         return clamp(a_,
                      type_convert<AccType>(numeric<SaturateType>::lowest()),
                      type_convert<AccType>(numeric<SaturateType>::max()));
     }
 };
  
 } // namespace ck_tile