cuda_toolkit/include/cuda/memory_resource

//===----------------------------------------------------------------------===//
//
// Part of the CUDA Toolkit, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//

#ifndef _CUDA_MEMORY_RESOURCE
#define _CUDA_MEMORY_RESOURCE

// clang-format off
/*
    memory_resource synopsis
namespace cuda {
namespace mr {
template <class Resource>
concept resource = equality_comparable<Resource>
                && requires(Resource& res, void* ptr, size_t size, size_t alignment) {
    { res.allocate(size, alignment) } -> same_as<void*>;
    { res.deallocate(ptr, size, alignment) } -> same_as<void>;
};

template <class Resource>
concept async_resource = resource<Resource>
                      && requires(Resource& res, void* ptr, size_t size, size_t alignment, cuda_stream_ref stream) {
    { res.allocate_async(size, alignment, stream) } -> same_as<void*>;
    { res.deallocate_async(ptr, size, alignment, stream) } -> same_as<void>;
};

template <class Resource, class Property>
concept has_property = resource<Resource> && requires(const Resource& res, Property prop) {
    get_property(res, prop);
};

template <class Property>
concept property_with_value = requires {
    typename Property::value_type;
};

template <class Resource, class Property, class Return>
concept has_property_with = resource<Resource>
                         && property_with_value<Property>
                         && same_as<Return, typename Property::value_type>
                         && requires(const Resource& res, Property prop) {
    get_property(res, prop) -> Return;
};

template <class Resource, class... Properties>
concept resource_with = resource<Resource> && (has_property<Resource, Properties> && ...);

template <class Resource, class... Properties>
concept async_resource_with = async_resource<Resource> && (has_property<Resource, Properties> && ...);

template <class... Properties>
class resource_ref {
    template <resource_with<Properties...> Resource>
    resource_ref(Resource&) noexcept;

    void* allocate(size_t size, size_t alignment);
    void deallocate(void* ptr, size_t size, size_t alignment);

    template <class... OtherProperties>
        requires resource_with<resource_ref, OtherProperties...>
              && resource_with<resource_ref<OtherProperties...>, Properties...>
    friend bool operator==(const resource_ref& left, const resource_ref<OtherProperties...>& right);

    template <property_with_value Property>
        requires has_property<resource_ref, Property>
    friend typename Property::value_type get_property(const resource_ref& ref, Property) noexcept;

    template <class Property>
        requires (has_property<resource_ref, Property> && !property_with_value<Property>)
    friend void get_property(const resource_ref& ref, Property) noexcept;
};

}  // mr
}  // cuda
*/
// clang-format on

#ifdef LIBCUDACXX_ENABLE_EXPERIMENTAL_MEMORY_RESOURCE

#include <cuda/stream_ref>

#include <cuda/std/concepts>
#include <cuda/std/type_traits>

#include <cuda/std/detail/__config>

#include <cuda/std/detail/__pragma_push>

#if _LIBCUDACXX_STD_VER > 11
_LIBCUDACXX_BEGIN_NAMESPACE_CUDA

///////////////////////////////////////////////////////////////////////////////
// properties

/// \concept has_property
/// \brief The \c has_property concept
template <class _Resource, class _Property>
_LIBCUDACXX_CONCEPT_FRAGMENT(
  __has_property_,
  requires(const _Resource& __res)(
    get_property(__res, _Property{})
  ));
template <class _Resource, class _Property>
_LIBCUDACXX_CONCEPT has_property = _LIBCUDACXX_FRAGMENT(__has_property_, _Resource, _Property);

/// \concept property_with_value
/// \brief The \c property_with_value concept
template <class _Property>
using __property_value_t = typename _Property::value_type;

template <class _Property>
_LIBCUDACXX_CONCEPT_FRAGMENT(
  __property_with_value_,
  requires()(
    typename(__property_value_t<_Property>)
  ));
template <class _Property>
_LIBCUDACXX_CONCEPT property_with_value = _LIBCUDACXX_FRAGMENT(__property_with_value_, _Property);

/// \concept has_property_with
/// \brief The \c has_property_with concept
template <class _Resource, class _Property, class _Return>
_LIBCUDACXX_CONCEPT_FRAGMENT(
  __has_property_with_,
  requires(const _Resource& __res)(
    requires(property_with_value<_Property>),
    requires(_CUDA_VSTD::same_as<_Return, decltype(get_property(__res, _Property{}))>)
  ));
template <class _Resource, class _Property, class _Return>
_LIBCUDACXX_CONCEPT has_property_with = _LIBCUDACXX_FRAGMENT(__has_property_with_, _Resource, _Property, _Return);

/// \concept __has_upstream_resource
/// \brief The \c __has_upstream_resource concept
template <class _Resource, class _Upstream>
_LIBCUDACXX_CONCEPT_FRAGMENT(
  __has_upstream_resource_,
  requires(const _Resource& __res)(
    requires(_CUDA_VSTD::same_as<_CUDA_VSTD::__remove_const_ref_t<decltype(__res.upstream_resource())>, _Upstream>)
  ));
template <class _Resource, class _Upstream>
_LIBCUDACXX_CONCEPT __has_upstream_resource = _LIBCUDACXX_FRAGMENT(__has_upstream_resource_, _Resource, _Upstream);

/// class forward_property
/// \brief The \c forward_property crtp template simplifies the user facing side of forwarding properties
///        We can just derive from it to properly forward all properties
_LIBCUDACXX_BEGIN_NAMESPACE_CPO(__forward_property)
template <class _Derived, class _Upstream>
struct __fn {
  _LIBCUDACXX_DISABLE_EXEC_CHECK
  _LIBCUDACXX_TEMPLATE(class _Property)
    _LIBCUDACXX_REQUIRES( (!property_with_value<_Property>) _LIBCUDACXX_AND has_property<_Upstream, _Property>)
  _LIBCUDACXX_INLINE_VISIBILITY friend constexpr void get_property(const _Derived&, _Property) noexcept {}

  // The indirection is needed, otherwise the compiler might believe that _Derived is an incomplete type
  _LIBCUDACXX_DISABLE_EXEC_CHECK
  _LIBCUDACXX_TEMPLATE(class _Property, class _Derived2 = _Derived)
    _LIBCUDACXX_REQUIRES( property_with_value<_Property> _LIBCUDACXX_AND has_property<_Upstream, _Property> _LIBCUDACXX_AND
              __has_upstream_resource<_Derived2, _Upstream>)
  _LIBCUDACXX_INLINE_VISIBILITY friend constexpr __property_value_t<_Property> get_property(
    const _Derived& __res, _Property __prop) {
    return get_property(__res.upstream_resource(), __prop);
  }
};
_LIBCUDACXX_END_NAMESPACE_CPO

template <class _Derived, class _Upstream>
using forward_property = __forward_property::__fn<_Derived, _Upstream>;

/// class get_property
/// \brief The \c get_property crtp temaplate simplifies the user facing side of forwarding properties
///        We can always tell people to just derive from it to properly forward all properties
_LIBCUDACXX_BEGIN_NAMESPACE_CPO(__get_property)
struct __fn {
  _LIBCUDACXX_DISABLE_EXEC_CHECK
  _LIBCUDACXX_TEMPLATE(class _Upstream, class _Property)
    _LIBCUDACXX_REQUIRES( (!property_with_value<_Property>) _LIBCUDACXX_AND has_property<_Upstream, _Property>)
  _LIBCUDACXX_INLINE_VISIBILITY constexpr void operator()(const _Upstream&, _Property) const noexcept {}

  _LIBCUDACXX_DISABLE_EXEC_CHECK
  _LIBCUDACXX_TEMPLATE(class _Upstream, class _Property)
    _LIBCUDACXX_REQUIRES( (property_with_value<_Property>) _LIBCUDACXX_AND has_property<_Upstream, _Property>)
  _LIBCUDACXX_INLINE_VISIBILITY constexpr __property_value_t<_Property> operator()(
    const _Upstream& __res, _Property __prop) const {
    return get_property(__res, __prop);
  }
};
_LIBCUDACXX_END_NAMESPACE_CPO

inline namespace __cpo {
  _LIBCUDACXX_CPO_ACCESSIBILITY auto get_property = __get_property::__fn{};
} // namespace __cpo

namespace mr
{

///////////////////////////////////////////////////////////////////////////////
// memory_resource

/// \concept resource
/// \brief The \c resource concept
template <class _Resource>
_LIBCUDACXX_CONCEPT_FRAGMENT(
  __resource_,
  requires(_Resource& __res, void* __ptr, size_t __bytes, size_t __alignment) (
    requires(_CUDA_VSTD::same_as<void*, decltype(__res.allocate(__bytes, __alignment))>),
    requires(_CUDA_VSTD::same_as<void, decltype(__res.deallocate(__ptr, __bytes, __alignment))>),
    requires(_CUDA_VSTD::equality_comparable<_Resource>)
  ));

template <class _Resource>
_LIBCUDACXX_CONCEPT resource = _LIBCUDACXX_FRAGMENT(__resource_, _Resource);

/// \concept async_resource
/// \brief The \c async_resource concept
template <class _Resource>
_LIBCUDACXX_CONCEPT_FRAGMENT(
  __async_resource_,
  requires(_Resource& __res, void* __ptr, size_t __bytes, size_t __alignment, cuda::stream_ref __stream) (
    requires(resource<_Resource>),
    requires(_CUDA_VSTD::same_as<void*, decltype(__res.allocate_async(__bytes, __alignment, __stream))>),
    requires(_CUDA_VSTD::same_as<void, decltype(__res.deallocate_async(__ptr, __bytes, __alignment, __stream))>),
    requires(_CUDA_VSTD::equality_comparable<_Resource>)
  ));

template <class _Resource>
_LIBCUDACXX_CONCEPT async_resource = _LIBCUDACXX_FRAGMENT(__async_resource_, _Resource);

/// \concept resource_with
/// \brief The \c resource_with concept
template <class _Resource, class... _Properties>
#if _LIBCUDACXX_STD_VER < 17
_LIBCUDACXX_CONCEPT resource_with =
  resource<_Resource>&& _CUDA_VSTD::conjunction_v<_CUDA_VSTD::bool_constant<has_property<_Resource, _Properties>>...>;
#else
_LIBCUDACXX_CONCEPT resource_with = resource<_Resource> && (has_property<_Resource, _Properties> && ...);
#endif

/// \concept async_resource_with
/// \brief The \c async_resource_with concept
template <class _Resource, class... _Properties>
#if _LIBCUDACXX_STD_VER < 17
_LIBCUDACXX_CONCEPT async_resource_with = async_resource<_Resource> &&
  _CUDA_VSTD::conjunction_v<_CUDA_VSTD::bool_constant<has_property<_Resource, _Properties>>...>;
#else
_LIBCUDACXX_CONCEPT async_resource_with = async_resource<_Resource> &&
  (has_property<_Resource, _Properties> && ...);
#endif

///////////////////////////////////////////////////////////////////////////////
/// class resource_ref
/// class async_resource_ref
enum class _AllocType
{
  _Default,
  _Async,
};

struct _Alloc_vtable
{
  using _AllocFn   = void* (*)(void*, size_t, size_t);
  using _DeallocFn = void (*)(void*, void*, size_t, size_t);
  using _EqualFn   = bool (*)(void*, void*);

  _AllocFn __alloc_fn;
  _DeallocFn __dealloc_fn;
  _EqualFn __equal_fn;

  constexpr _Alloc_vtable(_AllocFn __alloc_fn_, _DeallocFn __dealloc_fn_, _EqualFn __equal_fn_) noexcept
      : __alloc_fn(__alloc_fn_)
      , __dealloc_fn(__dealloc_fn_)
      , __equal_fn(__equal_fn_)
  {}
};

struct _Async_alloc_vtable : public _Alloc_vtable
{
  using _AsyncAllocFn   = void* (*)(void*, size_t, size_t, cuda::stream_ref);
  using _AsyncDeallocFn = void (*)(void*, void*, size_t, size_t, cuda::stream_ref);

  _AsyncAllocFn __async_alloc_fn;
  _AsyncDeallocFn __async_dealloc_fn;

  constexpr _Async_alloc_vtable(_Alloc_vtable::_AllocFn __alloc_fn_,
                                _Alloc_vtable::_DeallocFn __dealloc_fn_,
                                _Alloc_vtable::_EqualFn __equal_fn_,
                                _AsyncAllocFn __async_alloc_fn_,
                                _AsyncDeallocFn __async_dealloc_fn_) noexcept
      : _Alloc_vtable(__alloc_fn_, __dealloc_fn_, __equal_fn_)
      , __async_alloc_fn(__async_alloc_fn_)
      , __async_dealloc_fn(__async_dealloc_fn_)
  {}
};

// clang-format off
struct _Resource_vtable_builder
{
    template <class _Resource, class _Property>
    static __property_value_t<_Property> _Get_property(void* __res) noexcept {
        return get_property(*static_cast<const _Resource *>(__res), _Property{});
    }

    template <class _Resource>
    static void* _Alloc(void* __object, size_t __bytes, size_t __alignment) {
        return static_cast<_Resource *>(__object)->allocate(__bytes, __alignment);
    }

    template <class _Resource>
    static void _Dealloc(void* __object, void* __ptr, size_t __bytes, size_t __alignment) {
        return static_cast<_Resource *>(__object)->deallocate(__ptr, __bytes, __alignment);
    }

    template <class _Resource>
    static void* _Alloc_async(void* __object, size_t __bytes, size_t __alignment, cuda::stream_ref __stream) {
        return static_cast<_Resource *>(__object)->allocate_async(__bytes, __alignment, __stream);
    }

    template <class _Resource>
    static void _Dealloc_async(void* __object, void* __ptr, size_t __bytes, size_t __alignment, cuda::stream_ref __stream) {
        return static_cast<_Resource *>(__object)->deallocate_async(__ptr, __bytes, __alignment, __stream);
    }

    template <class _Resource>
    static bool _Equal(void* __left, void* __right) {
        return *static_cast<_Resource *>(__left) == *static_cast<_Resource *>(__right);
    }

    _LIBCUDACXX_TEMPLATE(class _Resource, _AllocType _Alloc_type)
      _LIBCUDACXX_REQUIRES((_Alloc_type == _AllocType::_Default)) //
     static constexpr _Alloc_vtable _Create() noexcept
    {
      return {&_Resource_vtable_builder::_Alloc<_Resource>,
              &_Resource_vtable_builder::_Dealloc<_Resource>,
              &_Resource_vtable_builder::_Equal<_Resource>};
    }

    _LIBCUDACXX_TEMPLATE(class _Resource, _AllocType _Alloc_type)
      _LIBCUDACXX_REQUIRES((_Alloc_type == _AllocType::_Async)) //
     static constexpr _Async_alloc_vtable _Create() noexcept
    {
      return {&_Resource_vtable_builder::_Alloc<_Resource>,
              &_Resource_vtable_builder::_Dealloc<_Resource>,
              &_Resource_vtable_builder::_Equal<_Resource>,
              &_Resource_vtable_builder::_Alloc_async<_Resource>,
              &_Resource_vtable_builder::_Dealloc_async<_Resource>};
    }
};
// clang-format on

template <class _Property>
struct _Property_vtable
{
  using _PropertyFn         = __property_value_t<_Property> (*)(void*);
  _PropertyFn __property_fn = nullptr;

  constexpr _Property_vtable(_PropertyFn __property_fn_) noexcept
      : __property_fn(__property_fn_)
  {}
};

template <_AllocType _Alloc_type, class... _Properties> //
class basic_resource_ref;

template <class... _Properties>
struct _Resource_vtable : public _Property_vtable<_Properties>...
{
  template <class... _PropertyFns>
  constexpr _Resource_vtable(_PropertyFns... __property_fn_) noexcept
      : _Property_vtable<_Properties>(__property_fn_)...
  {}

  template <_AllocType _Alloc_type, class... _OtherProperties>
  constexpr _Resource_vtable(basic_resource_ref<_Alloc_type, _OtherProperties...>& __ref) noexcept
      : _Property_vtable<_Properties>(__ref._Property_vtable<_Properties>::__property_fn)...
  {}

  template <class _Resource>
  static constexpr _Resource_vtable _Create() noexcept
  {
    return {&_Resource_vtable_builder::_Get_property<_Resource, _Properties>...};
  }
};

template <class... _Properties>
struct _Filtered;

template <bool _IsUniqueProperty>
struct _Property_filter
{
  template <class _Property, class... _Properties>
  using _Filtered_properties =
    typename _Filtered<_Properties...>::_Filtered_vtable::template _Append_property<_Property>;
};
template <>
struct _Property_filter<false>
{
  template <class _Property, class... _Properties>
  using _Filtered_properties = typename _Filtered<_Properties...>::_Filtered_vtable;
};

template <class _Property, class... _Properties>
struct _Filtered<_Property, _Properties...>
{
  using _Filtered_vtable =
    typename _Property_filter<property_with_value<_Property> && !_CUDA_VSTD::_One_of<_Property, _Properties...>>::
      template _Filtered_properties<_Property, _Properties...>;

  template <class _OtherPropery>
  using _Append_property = _Filtered<_OtherPropery, _Property, _Properties...>;

  using _Vtable = _Resource_vtable<_Property, _Properties...>;
};

template <>
struct _Filtered<>
{
  using _Filtered_vtable = _Filtered<>;

  template <class _OtherPropery>
  using _Append_property = _Filtered<_OtherPropery>;

  using _Vtable = _Resource_vtable<>;
};

template <class... _Properties>
using _Filtered_vtable = typename _Filtered<_Properties...>::_Filtered_vtable::_Vtable;

template <class _Vtable>
struct _Alloc_base
{
  static_assert(_CUDA_VSTD::is_base_of_v<_Alloc_vtable, _Vtable>, "");

  _Alloc_base(void* __object_, const _Vtable* __static_vtabl_) noexcept
      : __object(__object_)
      , __static_vtable(__static_vtabl_)
  {}

  void* allocate(size_t __bytes, size_t __alignment = alignof(max_align_t))
  {
    return __static_vtable->__alloc_fn(__object, __bytes, __alignment);
  }

  void deallocate(void* _Ptr, size_t __bytes, size_t __alignment = alignof(max_align_t))
  {
    __static_vtable->__dealloc_fn(__object, _Ptr, __bytes, __alignment);
  }

protected:
  void* __object                 = nullptr;
  const _Vtable* __static_vtable = nullptr;
};

template <class _Vtable>
struct _Async_alloc_base : public _Alloc_base<_Vtable>
{
  static_assert(_CUDA_VSTD::is_base_of_v<_Async_alloc_vtable, _Vtable>, "");

  _Async_alloc_base(void* __object_, const _Vtable* __static_vtabl_) noexcept
      : _Alloc_base<_Vtable>(__object_, __static_vtabl_)
  {}

  void* allocate_async(size_t __bytes, size_t __alignment, cuda::stream_ref __stream)
  {
    return this->__static_vtable->__async_alloc_fn(this->__object, __bytes, __alignment, __stream);
  }

  void* allocate_async(size_t __bytes, cuda::stream_ref __stream)
  {
    return this->__static_vtable->__async_alloc_fn(this->__object, __bytes, alignof(max_align_t), __stream);
  }

  void deallocate_async(void* _Ptr, size_t __bytes, cuda::stream_ref __stream)
  {
    this->__static_vtable->__async_dealloc_fn(this->__object, _Ptr, __bytes, alignof(max_align_t), __stream);
  }

  void deallocate_async(void* _Ptr, size_t __bytes, size_t __alignment, cuda::stream_ref __stream)
  {
    this->__static_vtable->__async_dealloc_fn(this->__object, _Ptr, __bytes, __alignment, __stream);
  }
};

template <_AllocType _Alloc_type>
using _Resource_ref_base = _CUDA_VSTD::
  _If<_Alloc_type == _AllocType::_Default, _Alloc_base<_Alloc_vtable>, _Async_alloc_base<_Async_alloc_vtable>>;

template <_AllocType _Alloc_type>
using _Vtable_store = _CUDA_VSTD::_If<_Alloc_type == _AllocType::_Default, _Alloc_vtable, _Async_alloc_vtable>;

template <_AllocType _Alloc_type, class _Resource>
_LIBCUDACXX_INLINE_VAR constexpr _Vtable_store<_Alloc_type>
  __alloc_vtable = _Resource_vtable_builder::template _Create<_Resource, _Alloc_type>();

template <class>
_LIBCUDACXX_INLINE_VAR constexpr bool _Is_basic_resource_ref = false;

template <_AllocType _Alloc_type, class... _Properties> //
class basic_resource_ref
    : public _Resource_ref_base<_Alloc_type>
    , private _Filtered_vtable<_Properties...>
{
private:
  template <_AllocType, class...>
  friend class basic_resource_ref;

  template <class...>
  friend struct _Resource_vtable;

public:
  // clang-format off
    _LIBCUDACXX_TEMPLATE(class _Resource)
        _LIBCUDACXX_REQUIRES( (!_Is_basic_resource_ref<_Resource>
          && (((_Alloc_type == _AllocType::_Default) && resource_with<_Resource, _Properties...>) //
            ||((_Alloc_type == _AllocType::_Async) && async_resource_with<_Resource, _Properties...>)))) //
     basic_resource_ref(_Resource& __res) noexcept
        : _Resource_ref_base<_Alloc_type>(_CUDA_VSTD::addressof(__res), &__alloc_vtable<_Alloc_type, _Resource>)
        , _Filtered_vtable<_Properties...>(_Filtered_vtable<_Properties...>::template _Create<_Resource>())
    {}

    _LIBCUDACXX_TEMPLATE(class _Resource)
        _LIBCUDACXX_REQUIRES( (!_Is_basic_resource_ref<_Resource>
          && (((_Alloc_type == _AllocType::_Default) && resource_with<_Resource, _Properties...>) //
            ||((_Alloc_type == _AllocType::_Async) && async_resource_with<_Resource, _Properties...>)))) //
     basic_resource_ref(_Resource* __res) noexcept
        : _Resource_ref_base<_Alloc_type>(__res, &__alloc_vtable<_Alloc_type, _Resource>)
        , _Filtered_vtable<_Properties...>(_Filtered_vtable<_Properties...>::template _Create<_Resource>())
    {}

    #if _LIBCUDACXX_STD_VER > 14
    _LIBCUDACXX_TEMPLATE(class... _OtherProperties)
      _LIBCUDACXX_REQUIRES( (_CUDA_VSTD::_One_of<_Properties, _OtherProperties...> && ...))
    #else
    _LIBCUDACXX_TEMPLATE(class... _OtherProperties)
      _LIBCUDACXX_REQUIRES( _CUDA_VSTD::conjunction_v<_CUDA_VSTD::bool_constant<
            _CUDA_VSTD::_One_of<_Properties, _OtherProperties...>>...>)
    #endif
     basic_resource_ref(
      basic_resource_ref<_Alloc_type, _OtherProperties...> __ref) noexcept
        : _Resource_ref_base<_Alloc_type>(__ref.__object, __ref.__static_vtable)
        , _Filtered_vtable<_Properties...>(__ref)
    {}

    #if _LIBCUDACXX_STD_VER > 14
    _LIBCUDACXX_TEMPLATE(class... _OtherProperties)
      _LIBCUDACXX_REQUIRES( (_Alloc_type == _AllocType::_Default)
        && (_CUDA_VSTD::_One_of<_Properties, _OtherProperties...> && ...))
    #else
    _LIBCUDACXX_TEMPLATE(class... _OtherProperties)
      _LIBCUDACXX_REQUIRES( (_Alloc_type == _AllocType::_Default)
        && _CUDA_VSTD::conjunction_v<_CUDA_VSTD::bool_constant<
            _CUDA_VSTD::_One_of<_Properties, _OtherProperties...>>...>)
    #endif
     basic_resource_ref(
      basic_resource_ref<_AllocType::_Async, _OtherProperties...> __ref) noexcept
        : _Resource_ref_base<_Alloc_type>(__ref.__object, __ref.__static_vtable)
        , _Filtered_vtable<_Properties...>(__ref)
    {}

    #if _LIBCUDACXX_STD_VER > 14
    _LIBCUDACXX_TEMPLATE(class... _OtherProperties)
      _LIBCUDACXX_REQUIRES((sizeof...(_Properties) == sizeof...(_OtherProperties))
            && (_CUDA_VSTD::_One_of<_Properties, _OtherProperties...> && ...))
    #else
    _LIBCUDACXX_TEMPLATE(class... _OtherProperties)
      _LIBCUDACXX_REQUIRES( (sizeof...(_Properties) == sizeof...(_OtherProperties))
          && _CUDA_VSTD::conjunction_v<_CUDA_VSTD::bool_constant<
          _CUDA_VSTD::_One_of<_Properties, _OtherProperties...>>...>)
    #endif
     bool operator==(
        const basic_resource_ref<_Alloc_type, _OtherProperties...> &__right) const {
        return (this->__static_vtable->__equal_fn == __right.__static_vtable->__equal_fn) //
            && this->__static_vtable->__equal_fn(this->__object, __right.__object);
    }

    #if _LIBCUDACXX_STD_VER > 14
    _LIBCUDACXX_TEMPLATE(class... _OtherProperties)
      _LIBCUDACXX_REQUIRES( (sizeof...(_Properties) == sizeof...(_OtherProperties))
            && (_CUDA_VSTD::_One_of<_Properties, _OtherProperties...> && ...))
    #else
    _LIBCUDACXX_TEMPLATE(class... _OtherProperties)
      _LIBCUDACXX_REQUIRES( (sizeof...(_Properties) == sizeof...(_OtherProperties))
          && _CUDA_VSTD::conjunction_v<_CUDA_VSTD::bool_constant<
          _CUDA_VSTD::_One_of<_Properties, _OtherProperties...>>...>)
    #endif
     bool operator!=(
        const basic_resource_ref<_Alloc_type, _OtherProperties...> &__right) const {
        return !(*this == __right);
    }

    _LIBCUDACXX_TEMPLATE(class _Property)
        _LIBCUDACXX_REQUIRES( (!property_with_value<_Property>) _LIBCUDACXX_AND  _CUDA_VSTD::_One_of<_Property, _Properties...>) //
     friend void get_property(const basic_resource_ref &, _Property) noexcept {}

    _LIBCUDACXX_TEMPLATE(class _Property)
        _LIBCUDACXX_REQUIRES(  property_with_value<_Property> _LIBCUDACXX_AND _CUDA_VSTD::_One_of<_Property, _Properties...>) //
     friend __property_value_t<_Property> get_property(
        const basic_resource_ref &__res, _Property) noexcept {
        return __res._Property_vtable<_Property>::__property_fn(__res.__object);
    }
  // clang-format on
};

template <_AllocType _Alloc_type, class... _Properties>
_LIBCUDACXX_INLINE_VAR constexpr bool _Is_basic_resource_ref<basic_resource_ref<_Alloc_type, _Properties...>> = true;

template <class... _Properties> //
using resource_ref = basic_resource_ref<_AllocType::_Default, _Properties...>;

template <class... _Properties> //
using async_resource_ref = basic_resource_ref<_AllocType::_Async, _Properties...>;

/// \struct device_accessible
/// \brief The \c device_accessible property signals that the allocated memory is device accessible
struct device_accessible{};

/// \struct host_accessible
/// \brief The \c host_accessible property signals that the allocated memory is host accessible
struct host_accessible{};

} // namespace mr
_LIBCUDACXX_END_NAMESPACE_CUDA
#endif // _LIBCUDACXX_STD_VER > 11

#include <cuda/std/detail/__pragma_pop>

#endif // LIBCUDACXX_ENABLE_EXPERIMENTAL_MEMORY_RESOURCE

#endif //_LIBCUDACXX_BEGIN_NAMESPACE_CUDA