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// <utility> -*- C++ -*-

// Copyright (C) 2001-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/*
 *
 * Copyright (c) 1994
 * Hewlett-Packard Company
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Hewlett-Packard Company makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 *
 * Copyright (c) 1996,1997
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 */

/** @file include/utility
 *  This is a Standard C++ Library header.
 */

#ifndef _GLIBCXX_UTILITY
#define _GLIBCXX_UTILITY 1

#pragma GCC system_header

/**
 * @defgroup utilities Utilities
 *
 * Components deemed generally useful. Includes pair, tuple,
 * forward/move helpers, ratio, function object, metaprogramming and
 * type traits, time, date, and memory functions.
 */

#include <bits/c++config.h>
#include <bits/stl_relops.h>
#include <bits/stl_pair.h>

#if __cplusplus >= 201103L

#include <type_traits>
#include <bits/move.h>
#include <initializer_list>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

/// Finds the size of a given tuple type.
  template<typename _Tp>
    struct tuple_size;

// _GLIBCXX_RESOLVE_LIB_DEFECTS
  // 2313. tuple_size should always derive from integral_constant<size_t, N>
  // 2770. tuple_size<const T> specialization is not SFINAE compatible

template<typename _Tp,
	   typename _Up = typename remove_cv<_Tp>::type,
	   typename = typename enable_if<is_same<_Tp, _Up>::value>::type,
	   size_t = tuple_size<_Tp>::value>
    using __enable_if_has_tuple_size = _Tp;

template<typename _Tp>
    struct tuple_size<const __enable_if_has_tuple_size<_Tp>>
    : public tuple_size<_Tp> { };

template<typename _Tp>
    struct tuple_size<volatile __enable_if_has_tuple_size<_Tp>>
    : public tuple_size<_Tp> { };

template<typename _Tp>
    struct tuple_size<const volatile __enable_if_has_tuple_size<_Tp>>
    : public tuple_size<_Tp> { };

/// Gives the type of the ith element of a given tuple type.
  template<std::size_t __i, typename _Tp>
    struct tuple_element;

// Duplicate of C++14's tuple_element_t for internal use in C++11 mode
  template<std::size_t __i, typename _Tp>
    using __tuple_element_t = typename tuple_element<__i, _Tp>::type;

template<std::size_t __i, typename _Tp>
    struct tuple_element<__i, const _Tp>
    {
      typedef typename add_const<__tuple_element_t<__i, _Tp>>::type type;
    };

template<std::size_t __i, typename _Tp>
    struct tuple_element<__i, volatile _Tp>
    {
      typedef typename add_volatile<__tuple_element_t<__i, _Tp>>::type type;
    };

template<std::size_t __i, typename _Tp>
    struct tuple_element<__i, const volatile _Tp>
    {
      typedef typename add_cv<__tuple_element_t<__i, _Tp>>::type type;
    };

#if __cplusplus > 201103L
#define __cpp_lib_tuple_element_t 201402

template<std::size_t __i, typename _Tp>
    using tuple_element_t = typename tuple_element<__i, _Tp>::type;
#endif

// Various functions which give std::pair a tuple-like interface.

/// Partial specialization for std::pair
  template<typename _T1, typename _T2>
    struct __is_tuple_like_impl<std::pair<_T1, _T2>> : true_type
    { };

/// Partial specialization for std::pair
  template<class _Tp1, class _Tp2>
    struct tuple_size<std::pair<_Tp1, _Tp2>>
    : public integral_constant<std::size_t, 2> { };

/// Partial specialization for std::pair
  template<class _Tp1, class _Tp2>
    struct tuple_element<0, std::pair<_Tp1, _Tp2>>
    { typedef _Tp1 type; };

/// Partial specialization for std::pair
  template<class _Tp1, class _Tp2>
    struct tuple_element<1, std::pair<_Tp1, _Tp2>>
    { typedef _Tp2 type; };

template<std::size_t _Int>
    struct __pair_get;

template<>
    struct __pair_get<0>
    {
      template<typename _Tp1, typename _Tp2>
        static constexpr _Tp1&
        __get(std::pair<_Tp1, _Tp2>& __pair) noexcept
        { return __pair.first; }

template<typename _Tp1, typename _Tp2>
        static constexpr _Tp1&&
        __move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept
        { return std::forward<_Tp1>(__pair.first); }

template<typename _Tp1, typename _Tp2>
        static constexpr const _Tp1&
        __const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept
        { return __pair.first; }

template<typename _Tp1, typename _Tp2>
        static constexpr const _Tp1&&
        __const_move_get(const std::pair<_Tp1, _Tp2>&& __pair) noexcept
        { return std::forward<const _Tp1>(__pair.first); }
    };

template<>
    struct __pair_get<1>
    {
      template<typename _Tp1, typename _Tp2>
        static constexpr _Tp2&
        __get(std::pair<_Tp1, _Tp2>& __pair) noexcept
        { return __pair.second; }

template<typename _Tp1, typename _Tp2>
        static constexpr _Tp2&&
        __move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept
        { return std::forward<_Tp2>(__pair.second); }

template<typename _Tp1, typename _Tp2>
        static constexpr const _Tp2&
        __const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept
        { return __pair.second; }

template<typename _Tp1, typename _Tp2>
        static constexpr const _Tp2&&
        __const_move_get(const std::pair<_Tp1, _Tp2>&& __pair) noexcept
        { return std::forward<const _Tp2>(__pair.second); }
    };

template<std::size_t _Int, class _Tp1, class _Tp2>
    constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&
    get(std::pair<_Tp1, _Tp2>& __in) noexcept
    { return __pair_get<_Int>::__get(__in); }

template<std::size_t _Int, class _Tp1, class _Tp2>
    constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&&
    get(std::pair<_Tp1, _Tp2>&& __in) noexcept
    { return __pair_get<_Int>::__move_get(std::move(__in)); }

template<std::size_t _Int, class _Tp1, class _Tp2>
    constexpr const typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&
    get(const std::pair<_Tp1, _Tp2>& __in) noexcept
    { return __pair_get<_Int>::__const_get(__in); }

template<std::size_t _Int, class _Tp1, class _Tp2>
    constexpr const typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&&
    get(const std::pair<_Tp1, _Tp2>&& __in) noexcept
    { return __pair_get<_Int>::__const_move_get(std::move(__in)); }

#if __cplusplus > 201103L

#define __cpp_lib_tuples_by_type 201304

template <typename _Tp, typename _Up>
    constexpr _Tp&
    get(pair<_Tp, _Up>& __p) noexcept
    { return __p.first; }

template <typename _Tp, typename _Up>
    constexpr const _Tp&
    get(const pair<_Tp, _Up>& __p) noexcept
    { return __p.first; }

template <typename _Tp, typename _Up>
    constexpr _Tp&&
    get(pair<_Tp, _Up>&& __p) noexcept
    { return std::move(__p.first); }

template <typename _Tp, typename _Up>
    constexpr const _Tp&&
    get(const pair<_Tp, _Up>&& __p) noexcept
    { return std::move(__p.first); }

template <typename _Tp, typename _Up>
    constexpr _Tp&
    get(pair<_Up, _Tp>& __p) noexcept
    { return __p.second; }

template <typename _Tp, typename _Up>
    constexpr const _Tp&
    get(const pair<_Up, _Tp>& __p) noexcept
    { return __p.second; }

template <typename _Tp, typename _Up>
    constexpr _Tp&&
    get(pair<_Up, _Tp>&& __p) noexcept
    { return std::move(__p.second); }

template <typename _Tp, typename _Up>
    constexpr const _Tp&&
    get(const pair<_Up, _Tp>&& __p) noexcept
    { return std::move(__p.second); }

#define __cpp_lib_exchange_function 201304

/// Assign @p __new_val to @p __obj and return its previous value.
  template <typename _Tp, typename _Up = _Tp>
    inline _Tp
    exchange(_Tp& __obj, _Up&& __new_val)
    { return std::__exchange(__obj, std::forward<_Up>(__new_val)); }
#endif

// Stores a tuple of indices.  Used by tuple and pair, and by bind() to
  // extract the elements in a tuple.
  template<size_t... _Indexes> struct _Index_tuple { };

#ifdef __has_builtin
# if __has_builtin(__make_integer_seq)
#  define _GLIBCXX_USE_MAKE_INTEGER_SEQ 1
# endif
#endif

// Builds an _Index_tuple<0, 1, 2, ..., _Num-1>.
  template<size_t _Num>
    struct _Build_index_tuple
    {
#if _GLIBCXX_USE_MAKE_INTEGER_SEQ
      template<typename, size_t... _Indices>
        using _IdxTuple = _Index_tuple<_Indices...>;

using __type = __make_integer_seq<_IdxTuple, size_t, _Num>;
#else
      using __type = _Index_tuple<__integer_pack(_Num)...>;
#endif
    };

#if __cplusplus > 201103L

#define __cpp_lib_integer_sequence 201304

/// Class template integer_sequence
  template<typename _Tp, _Tp... _Idx>
    struct integer_sequence
    {
      typedef _Tp value_type;
      static constexpr size_t size() noexcept { return sizeof...(_Idx); }
    };

/// Alias template make_integer_sequence
  template<typename _Tp, _Tp _Num>
    using make_integer_sequence
#if _GLIBCXX_USE_MAKE_INTEGER_SEQ
      = __make_integer_seq<integer_sequence, _Tp, _Num>;
#else
      = integer_sequence<_Tp, __integer_pack(_Num)...>;
#endif

#undef _GLIBCXX_USE_MAKE_INTEGER_SEQ

/// Alias template index_sequence
  template<size_t... _Idx>
    using index_sequence = integer_sequence<size_t, _Idx...>;

/// Alias template make_index_sequence
  template<size_t _Num>
    using make_index_sequence = make_integer_sequence<size_t, _Num>;

/// Alias template index_sequence_for
  template<typename... _Types>
    using index_sequence_for = make_index_sequence<sizeof...(_Types)>;
#endif

#if __cplusplus > 201402L

struct in_place_t {
    explicit in_place_t() = default;
  };

inline constexpr in_place_t in_place{};

template<typename _Tp> struct in_place_type_t
  {
    explicit in_place_type_t() = default;
  };

template<typename _Tp>
    inline constexpr in_place_type_t<_Tp> in_place_type{};

template<size_t _Idx> struct in_place_index_t
  {
    explicit in_place_index_t() = default;
  };

template<size_t _Idx>
    inline constexpr in_place_index_t<_Idx> in_place_index{};

template<typename>
    struct __is_in_place_type_impl : false_type
    { };

template<typename _Tp>
    struct __is_in_place_type_impl<in_place_type_t<_Tp>> : true_type
    { };

template<typename _Tp>
    struct __is_in_place_type
      : public __is_in_place_type_impl<_Tp>
    { };

#define  __cpp_lib_as_const 201510
  template<typename _Tp>
    constexpr add_const_t<_Tp>& as_const(_Tp& __t) noexcept { return __t; }

template<typename _Tp>
    void as_const(const _Tp&&) = delete;

#endif // C++17

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif

#endif /* _GLIBCXX_UTILITY */

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
..	DIR	-	drwxr-xr-x	2025-08-26 09:44:51
backward	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
bits	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
debug	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
decimal	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
experimental	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
ext	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
parallel	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
profile	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
tr1	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
tr2	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
x86_64-redhat-linux	DIR	-	drwxr-xr-x	2025-08-26 09:45:06
algorithm	text/x-c	2.46 KB	-rw-r--r--	2025-08-26 09:45:05
any	text/x-c	18.17 KB	-rw-r--r--	2025-08-26 09:45:05
array	text/x-c	11.38 KB	-rw-r--r--	2025-08-26 09:45:05
atomic	text/x-c	40.09 KB	-rw-r--r--	2025-08-26 09:45:05
bitset	text/x-c	44.83 KB	-rw-r--r--	2025-08-26 09:45:05
cassert	text/x-c	1.61 KB	-rw-r--r--	2025-08-26 09:45:05
ccomplex	text/x-c	1.3 KB	-rw-r--r--	2025-08-26 09:45:05
cctype	text/x-c	2.35 KB	-rw-r--r--	2025-08-26 09:45:05
cerrno	text/x-c	1.73 KB	-rw-r--r--	2025-08-26 09:45:05
cfenv	text/x-c	2 KB	-rw-r--r--	2025-08-26 09:45:05
cfloat	text/x-c	1.84 KB	-rw-r--r--	2025-08-26 09:45:05
charconv	text/x-c	16.32 KB	-rw-r--r--	2025-08-26 09:45:05
chrono	text/x-c	29.17 KB	-rw-r--r--	2025-08-26 09:45:05
cinttypes	text/x-c	2.11 KB	-rw-r--r--	2025-08-26 09:45:05
ciso646	text/x-c	1.43 KB	-rw-r--r--	2025-08-26 09:45:05
climits	text/x-c	1.87 KB	-rw-r--r--	2025-08-26 09:45:05
clocale	text/x-c	1.86 KB	-rw-r--r--	2025-08-26 09:45:05
cmath	text/x-c	47.01 KB	-rw-r--r--	2025-08-26 09:45:05
codecvt	text/x-c	5.22 KB	-rw-r--r--	2025-08-26 09:45:05
complex	text/x-c	53.26 KB	-rw-r--r--	2025-08-26 09:45:05
complex.h	text/x-c	1.56 KB	-rw-r--r--	2025-08-26 09:45:05
condition_variable	text/x-c	8.74 KB	-rw-r--r--	2025-08-26 09:45:05
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cstdio	text/x-c	4.33 KB	-rw-r--r--	2025-08-26 09:45:05
cstdlib	text/x-c	6.18 KB	-rw-r--r--	2025-08-26 09:45:05
cstring	text/x-c	3.05 KB	-rw-r--r--	2025-08-26 09:45:05
ctgmath	text/x-c	1.33 KB	-rw-r--r--	2025-08-26 09:45:05
ctime	text/x-c	2.08 KB	-rw-r--r--	2025-08-26 09:45:05
cuchar	text/x-c	2.16 KB	-rw-r--r--	2025-08-26 09:45:05
cwchar	text/x-c	6.36 KB	-rw-r--r--	2025-08-26 09:45:05
cwctype	text/x-c	2.73 KB	-rw-r--r--	2025-08-26 09:45:05
cxxabi.h	text/x-c	21.46 KB	-rw-r--r--	2025-08-26 09:45:07
deque	text/x-c	2.6 KB	-rw-r--r--	2025-08-26 09:45:05
exception	text/x-c	4.69 KB	-rw-r--r--	2025-08-26 09:45:07
fenv.h	text/x-c	1.97 KB	-rw-r--r--	2025-08-26 09:45:05
filesystem	text/x-c	1.4 KB	-rw-r--r--	2025-08-26 09:45:05
forward_list	text/x-c	1.54 KB	-rw-r--r--	2025-08-26 09:45:05
fstream	text/x-c	35.92 KB	-rw-r--r--	2025-08-26 09:45:05
functional	text/x-c	36.87 KB	-rw-r--r--	2025-08-26 09:45:05
future	text/x-c	49.49 KB	-rw-r--r--	2025-08-26 09:45:05
initializer_list	text/x-c	2.9 KB	-rw-r--r--	2025-08-26 09:45:07
iomanip	text/x-c	16.16 KB	-rw-r--r--	2025-08-26 09:45:05
ios	text/x-c	1.56 KB	-rw-r--r--	2025-08-26 09:45:05
iosfwd	text/x-c	6.76 KB	-rw-r--r--	2025-08-26 09:45:05
iostream	text/x-c	2.63 KB	-rw-r--r--	2025-08-26 09:45:05
istream	text/x-c	32.07 KB	-rw-r--r--	2025-08-26 09:45:05
iterator	text/x-c	2.58 KB	-rw-r--r--	2025-08-26 09:45:05
limits	text/x-c	67.56 KB	-rw-r--r--	2025-08-26 09:45:05
list	text/x-c	2.53 KB	-rw-r--r--	2025-08-26 09:45:05
locale	text/x-c	1.45 KB	-rw-r--r--	2025-08-26 09:45:05
map	text/x-c	2.5 KB	-rw-r--r--	2025-08-26 09:45:05
math.h	text/plain	4.26 KB	-rw-r--r--	2025-08-26 09:45:05
memory	text/x-c++	4.6 KB	-rw-r--r--	2025-08-26 09:45:05
mutex	text/x-c	17.8 KB	-rw-r--r--	2025-08-26 09:45:05
new	text/x-c	7.34 KB	-rw-r--r--	2025-08-26 09:45:07
numeric	text/x-c	5.32 KB	-rw-r--r--	2025-08-26 09:45:05
optional	text/x-c	42.93 KB	-rw-r--r--	2025-08-26 09:45:05
ostream	text/x-c	21.57 KB	-rw-r--r--	2025-08-26 09:45:05
queue	text/x-c	2.41 KB	-rw-r--r--	2025-08-26 09:45:05
random	text/x-c	1.65 KB	-rw-r--r--	2025-08-26 09:45:05
ratio	text/x-c	19.42 KB	-rw-r--r--	2025-08-26 09:45:05
regex	text/x-c	1.85 KB	-rw-r--r--	2025-08-26 09:45:05
scoped_allocator	text/x-c	15.84 KB	-rw-r--r--	2025-08-26 09:45:05
set	text/x-c	2.5 KB	-rw-r--r--	2025-08-26 09:45:05
shared_mutex	text/x-c	18.95 KB	-rw-r--r--	2025-08-26 09:45:05
sstream	text/x-c	26.24 KB	-rw-r--r--	2025-08-26 09:45:05
stack	text/x-c	2.33 KB	-rw-r--r--	2025-08-26 09:45:05
stdexcept	text/x-c	7.79 KB	-rw-r--r--	2025-08-26 09:45:05
stdlib.h	text/plain	2.2 KB	-rw-r--r--	2025-08-26 09:45:05
streambuf	text/x-c	29.31 KB	-rw-r--r--	2025-08-26 09:45:05
string	text/x-c	1.89 KB	-rw-r--r--	2025-08-26 09:45:05
string_view	text/x-c	20.3 KB	-rw-r--r--	2025-08-26 09:45:05
system_error	text/x-c	11.25 KB	-rw-r--r--	2025-08-26 09:45:05
tgmath.h	text/x-c	1.33 KB	-rw-r--r--	2025-08-26 09:45:05
thread	text/x-c	10.27 KB	-rw-r--r--	2025-08-26 09:45:05
tuple	text/x-c	58.94 KB	-rw-r--r--	2025-08-26 09:45:05
type_traits	text/x-c	83.86 KB	-rw-r--r--	2025-08-26 09:45:05
typeindex	text/x-c	3.02 KB	-rw-r--r--	2025-08-26 09:45:05
typeinfo	text/x-c	7.51 KB	-rw-r--r--	2025-08-26 09:45:07
unordered_map	text/x-c	1.8 KB	-rw-r--r--	2025-08-26 09:45:05
unordered_set	text/x-c	1.8 KB	-rw-r--r--	2025-08-26 09:45:05
utility	text/x-c	12.01 KB	-rw-r--r--	2025-08-26 09:45:05
valarray	text/x-c	39.33 KB	-rw-r--r--	2025-08-26 09:45:05
variant	text/x-c	47.11 KB	-rw-r--r--	2025-08-26 09:45:05
vector	text/x-c	2.68 KB	-rw-r--r--	2025-08-26 09:45:05

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