// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, 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
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCUDACXX_FUNCTIONAL_BASE
#define _LIBCUDACXX_FUNCTIONAL_BASE

#ifndef __cuda_std__
#include <__config>
#include <typeinfo>
#include <exception>
#include <new>
#endif // __cuda_std__

#include "__functional/binary_function.h"
#include "__functional/operations.h"
#include "__functional/reference_wrapper.h"
#include "__functional/unary_function.h"
#include "__functional/weak_result_type.h"
#include "__type_traits/integral_constant.h"
#include "__type_traits/is_constructible.h"
#include "__type_traits/is_convertible.h"
#include "__type_traits/remove_cvref.h"
#include "__utility/forward.h"

#ifndef __cuda_std__
#include <__pragma_push>
#endif // __cuda_std__

#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
#  pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
#  pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
#  pragma system_header
#endif // no system header

_LIBCUDACXX_BEGIN_NAMESPACE_STD

// allocator_arg_t

struct _LIBCUDACXX_TEMPLATE_VIS allocator_arg_t { explicit allocator_arg_t() = default; };

#if defined(_LIBCUDACXX_BUILDING_LIBRARY)
extern _LIBCUDACXX_EXPORTED_FROM_ABI const allocator_arg_t allocator_arg;
#else
/* _LIBCUDACXX_INLINE_VAR */ constexpr allocator_arg_t allocator_arg = allocator_arg_t();
#endif

// uses_allocator

template <class _Tp>
struct __has_allocator_type
{
private:
    struct __two {char __lx; char __lxx;};
    template <class _Up> _LIBCUDACXX_INLINE_VISIBILITY static __two __test(...);
    template <class _Up> _LIBCUDACXX_INLINE_VISIBILITY static char __test(typename _Up::allocator_type* = 0);
public:
    static const bool value = sizeof(__test<_Tp>(0)) == 1;
};

template <class _Tp, class _Alloc, bool = __has_allocator_type<_Tp>::value>
struct __uses_allocator
    : public integral_constant<bool,
        is_convertible<_Alloc, typename _Tp::allocator_type>::value>
{
};

template <class _Tp, class _Alloc>
struct __uses_allocator<_Tp, _Alloc, false>
    : public false_type
{
};

template <class _Tp, class _Alloc>
struct _LIBCUDACXX_TEMPLATE_VIS uses_allocator
    : public __uses_allocator<_Tp, _Alloc>
{
};

#if _LIBCUDACXX_STD_VER > 14
template <class _Tp, class _Alloc>
_LIBCUDACXX_INLINE_VAR constexpr size_t uses_allocator_v = uses_allocator<_Tp, _Alloc>::value;
#endif

// allocator construction

template <class _Tp, class _Alloc, class ..._Args>
struct __uses_alloc_ctor_imp
{
    typedef _LIBCUDACXX_NODEBUG_TYPE __remove_cvref_t<_Alloc> _RawAlloc;
    static const bool __ua = uses_allocator<_Tp, _RawAlloc>::value;
    static const bool __ic =
        is_constructible<_Tp, allocator_arg_t, _Alloc, _Args...>::value;
    static const int value = __ua ? 2 - __ic : 0;
};

template <class _Tp, class _Alloc, class ..._Args>
struct __uses_alloc_ctor
    : integral_constant<int, __uses_alloc_ctor_imp<_Tp, _Alloc, _Args...>::value>
    {};

template <class _Tp, class _Allocator, class... _Args>
inline _LIBCUDACXX_INLINE_VISIBILITY
void __user_alloc_construct_impl (integral_constant<int, 0>, _Tp *__storage, const _Allocator &, _Args &&... __args )
{
    new (__storage) _Tp (_CUDA_VSTD::forward<_Args>(__args)...);
}

// FIXME: This should have a version which takes a non-const alloc.
template <class _Tp, class _Allocator, class... _Args>
inline _LIBCUDACXX_INLINE_VISIBILITY
void __user_alloc_construct_impl (integral_constant<int, 1>, _Tp *__storage, const _Allocator &__a, _Args &&... __args )
{
    new (__storage) _Tp (allocator_arg, __a, _CUDA_VSTD::forward<_Args>(__args)...);
}

// FIXME: This should have a version which takes a non-const alloc.
template <class _Tp, class _Allocator, class... _Args>
inline _LIBCUDACXX_INLINE_VISIBILITY
void __user_alloc_construct_impl (integral_constant<int, 2>, _Tp *__storage, const _Allocator &__a, _Args &&... __args )
{
    new (__storage) _Tp (_CUDA_VSTD::forward<_Args>(__args)..., __a);
}

_LIBCUDACXX_END_NAMESPACE_STD

#ifndef __cuda_std__
#include <__pragma_pop>
#endif // __cuda_std__

#endif  // _LIBCUDACXX_FUNCTIONAL_BASE