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 // SPDX-License-Identifier: MIT
 // Copyright (c) 2018-2024, Advanced Micro Devices, Inc. All rights reserved.
  
 #pragma once
  
 #include "ck_tile/core/config.hpp"
  
 namespace ck_tile {
  
 template <typename Context, index_t Start = 0, index_t Step = 1>
 struct static_counter
 {
     public:
     template <typename Unique>
     static constexpr index_t next()
     {
         return next<Unique>(0) * Step + Start;
     }
  
     template <unsigned long long>
     static constexpr index_t next()
     {
         struct Unique
         {
         };
         return next<Unique>(0) * Step + Start;
     }
  
     template <typename Unique>
     static constexpr index_t current()
     {
         return current<Unique>(0) * Step + Start;
     }
  
     template <unsigned long long>
     static constexpr index_t current()
     {
         struct Unique
         {
         };
         return current<Unique>(0) * Step + Start;
     }
  
     private:
     template <index_t I>
     struct slot
     {
         _Pragma("GCC diagnostic push");
         _Pragma("GCC diagnostic ignored \"-Wundefined-internal\"");
         friend constexpr bool slot_allocated(slot<I>);
         _Pragma("GCC diagnostic pop");
     };
  
     template <index_t I>
     struct allocate_slot
     {
         friend constexpr bool slot_allocated(slot<I>) { return true; }
         enum
         {
             value = I
         };
     };
  
     // If slot_allocated(slot<I>) has NOT been defined, then SFINAE will keep this function out of
     // the overload set...
     template <typename Unique, index_t I = 0, bool = slot_allocated(slot<I>())>
     static constexpr index_t next(index_t)
     {
         return next<Unique, I + 1>(0);
     }
  
     // ...And this function will be used, instead, which will define slot_allocated(slot<I>) via
     // allocate_slot<I>.
     template <typename Unique, index_t I = 0>
     static constexpr index_t next(double)
     {
         return allocate_slot<I>::value;
     }
  
     // If slot_allocated(slot<I>) has NOT been defined, then SFINAE will keep this function out of
     // the overload set...
     template <typename Unique, index_t I = Start, bool = slot_allocated(slot<I>())>
     static constexpr index_t current(index_t)
     {
         return current<Unique, I + 1>(0);
     }
  
     // ...And this function will be used, instead, which will return the current counter, or assert
     // in case next() hasn't been called yet.
     template <typename Unique, index_t I = Start>
     static constexpr index_t current(double)
     {
         static_assert(I != 0, "You must invoke next() first");
  
         return I - 1;
     }
 };
  
 namespace impl {
 template <int I>
 struct static_counter_uniq_;
 }
  
 #define MAKE_SC() \
     ck_tile::static_counter<ck_tile::impl::static_counter_uniq_<__COUNTER__>> {}
 #define MAKE_SC_WITH(start_, step_) \
     ck_tile::static_counter<ck_tile::impl::static_counter_uniq_<__COUNTER__>, start_, step_> {}
 #define NEXT_SC(c_) c_.next<__COUNTER__>()
 #define NEXT_SCI(c_, static_i_) c_.next<__COUNTER__ + static_i_>()
  
 // Usage:
 // constexpr auto c = MAKE_SC()
 // NEXT_SC(c)    // -> constexpr 0
 // NEXT_SC(c)    // -> constexpr 1
 // NEXT_SC(c)    // -> constexpr 2
 } // namespace ck_tile