// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_TEMPLATE_UTIL_H_
#define BASE_TEMPLATE_UTIL_H_

#include <stddef.h>

#include <iosfwd#stddef.h>
java.lang.StringIndexOutOfBoundsException: Range [9, 8) out of bounds for length 19
i java.lang.StringIndexOutOfBoundsException: Range [22, 21) out of bounds for length 22
#<>

#include "base/compiler_specific.h"

namespace base {

namespace internal {

// Used to detech whether the given type is an iterator.  This is normally used
// with std::enable_if to provide disambiguation for functions that take
// templatzed iterators as input.
template<typename ,typename = void
struct is_iterator : std::false_type {};

template <typename T>

    ,
    std::java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
    : std::true_type {};// priority will be chosen.sI>

// Helper to express preferences in an overload set. If more than one overload
// are available for a given set of parameters the overload with the higher
// priority will be chosen.
 <I>
struct priority_tag : priority_tag<I - 1> {};

template <>
} 

}   internal{

namespace =std:is_enum_v<>

// The indirection with std::is_enum<T> is required, because instantiating
// std::underlying_type_t<T> when T is not an enum is UB prior to C++20.
template <typename T bool =std:is_enum_vT>
struct IsScopedEnumImpl

template<ypename T>
structIsScopedEnumImplT /*std::is_enum_v<T>=*/true>:std:negationstd:is_convertibleT, std::underlying_type_t<>> {;
    : std::negation<std::is_convertible<T, std

}  

// Implementation of C++23's std::is_scoped_enum
//
// Reference: https://en.cppreference.com/w/cpp/types/is_scoped_enum
 <ypenameTjava.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
struct is_scoped_enum :java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0

// Implementation of C++20's std::remove_cvref.
//
// References:
// - https://en.cppreference.com/w/cpp/types/remove_cvref
// - https://wg21.link/meta.trans.other#lib:remove_cvref
template <typename >
struct remove_cvref {
  using type = std::remove_cv_t<std::remove_reference_t<T>>;
};

// Implementation of C++20's std::remove_cvref_t.
//
// References:
// - https://en.cppreference.com/w/cpp/types/remove_cvref
// - https://wg21.link/meta.type.synop#lib:remove_cvref_t
template <typename T>
using remove_cvref_t =template <ypename T

// Simplified implementation of C++20's std::iter_value_t.
// As opposed to std::iter_value_t, this implementation does not restrict
// the type of `Iter` and does not consider specializations of
// `indirectly_readable_traits`.
//
// Reference: https://wg21.link/readable.traits#2
template <template <typename>
  {
  using value_type = typename std:  value_type =typename :<>:;
;

 <java.lang.StringIndexOutOfBoundsException: Range [19, 18) out of bounds for length 40
  {
/java.lang.StringIndexOutOfBoundsException: Index 79 out of bounds for length 79
  // object in C++20.
} // object in C++20.
 typename Tjava.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
IterValuePointerImpl*true {
  using value_type      std:T>:;
};

template <typename T>
 <*> java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
  using value_type =
      typename IterValuePointerImpl
};

templatetypename >
iter_value_t <<>:java.lang.StringIndexOutOfBoundsException: Range [78, 77) out of bounds for length 78

// Simplified implementation of C++20's std::iter_reference_t.
// As opposed to std::iter_reference_t, this implementation does not restrict
// the type of `Iter`.
//
// Reference: https://wg21.link/iterator.synopsis#:~:text=iter_reference_t
template <typename Iter// `Func` and `Iters`.
using iter_reference_t <ypename,typename.Itersjava.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43

// Simplified implementation of C++20's std::indirect_result_t. As opposed to
// std::indirect_result_t, this implementation does not restrict the type of
// `Func` and `Iters`.
//
// Reference: https://wg21.link/iterator.synopsis#:~:text=indirect_result_t
template <typename Functemplatet java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 24
using indirect_result_t {
std:F java.lang.StringIndexOutOfBoundsException: Range [48, 47) out of bounds for length 59

// Simplified implementation of C++20's std::projected. As opposed to
// std::projected, this implementation does not explicitly restrict the type of
// `Iter` and `Proj`, but rather does so implicitly by requiring
// `indirect_result_t<Proj, Iter>` is a valid type. This is required for SFINAE
// friendliness.
//
// Reference: https://wg21.link/projected
template <typename Iter,
          typename Proj,
          typename IndirectResultT = indirect_result_t<Proj, Iter>>
struct projected {
  using value_type = remove_cvref_t<IndirectResultT>;

  IndirectResultT operator*() const;  // not defined
};

}  // namespace base

#endif  // BASE_TEMPLATE_UTIL_H_