// -*- 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 _LIBCPP_STRING
#define _LIBCPP_STRING

// clang-format off

/*
    string synopsis

#include <compare>
#include <initializer_list>

namespace std
{

template <class stateT>
class fpos
{
private:
    stateT st;
public:
    fpos(streamoff = streamoff());

    operator streamoff() const;

    stateT state() const;
    void state(stateT);

    fpos& operator+=(streamoff);
    fpos  operator+ (streamoff) const;
    fpos& operator-=(streamoff);
    fpos  operator- (streamoff) const;
};

template <class stateT> streamoff operator-(const fpos<stateT>& x, const fpos<stateT>& y);

template <class stateT> bool operator==(const fpos<stateT>& x, const fpos<stateT>& y);
template <class stateT> bool operator!=(const fpos<stateT>& x, const fpos<stateT>& y);

template <class charT>
struct char_traits
{
    using char_type           = charT;
    using int_type            = ...;
    using off_type            = streamoff;
    using pos_type            = streampos;
    using state_type          = mbstate_t;
    using comparison_category = strong_ordering; // Since C++20 only for the specializations
                                                 // char, wchar_t, char8_t, char16_t, and char32_t.

    static void assign(char_type& c1, const char_type& c2) noexcept;
    static constexpr bool eq(char_type c1, char_type c2) noexcept;
    static constexpr bool lt(char_type c1, char_type c2) noexcept;

    static int              compare(const char_type* s1, const char_type* s2, size_t n);
    static size_t           length(const char_type* s);
    static const char_type* find(const char_type* s, size_t n, const char_type& a);
    static char_type*       move(char_type* s1, const char_type* s2, size_t n);
    static char_type*       copy(char_type* s1, const char_type* s2, size_t n);
    static char_type*       assign(char_type* s, size_t n, char_type a);

    static constexpr int_type  not_eof(int_type c) noexcept;
    static constexpr char_type to_char_type(int_type c) noexcept;
    static constexpr int_type  to_int_type(char_type c) noexcept;
    static constexpr bool      eq_int_type(int_type c1, int_type c2) noexcept;
    static constexpr int_type  eof() noexcept;
};

template <> struct char_traits<char>;
template <> struct char_traits<wchar_t>;
template <> struct char_traits<char8_t>;  // C++20
template <> struct char_traits<char16_t>;
template <> struct char_traits<char32_t>;

template<class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
class basic_string
{
public:
// types:
    typedef traits traits_type;
    typedef typename traits_type::char_type value_type;
    typedef Allocator allocator_type;
    typedef typename allocator_type::size_type size_type;
    typedef typename allocator_type::difference_type difference_type;
    typedef typename allocator_type::reference reference;
    typedef typename allocator_type::const_reference const_reference;
    typedef typename allocator_type::pointer pointer;
    typedef typename allocator_type::const_pointer const_pointer;
    typedef implementation-defined iterator;
    typedef implementation-defined const_iterator;
    typedef std::reverse_iterator<iterator> reverse_iterator;
    typedef std::reverse_iterator<const_iterator> const_reverse_iterator;

    static const size_type npos = -1;

    basic_string()
        noexcept(is_nothrow_default_constructible<allocator_type>::value);                      // constexpr since C++20
    explicit basic_string(const allocator_type& a);                                             // constexpr since C++20
    basic_string(const basic_string& str);                                                      // constexpr since C++20
    basic_string(basic_string&& str)
        noexcept(is_nothrow_move_constructible<allocator_type>::value);                         // constexpr since C++20
    basic_string(const basic_string& str, size_type pos,
                 const allocator_type& a = allocator_type());                                   // constexpr since C++20
    basic_string(const basic_string& str, size_type pos, size_type n,
                 const Allocator& a = Allocator());                                             // constexpr since C++20
    constexpr basic_string(
        basic_string&& str, size_type pos, const Allocator& a = Allocator());                   // since C++23
    constexpr basic_string(
        basic_string&& str, size_type pos, size_type n, const Allocator& a = Allocator());      // since C++23
    template<class T>
        basic_string(const T& t, size_type pos, size_type n, const Allocator& a = Allocator()); // C++17, constexpr since C++20
    template <class T>
        explicit basic_string(const T& t, const Allocator& a = Allocator());                    // C++17, constexpr since C++20
    basic_string(const value_type* s, const allocator_type& a = allocator_type());              // constexpr since C++20
    basic_string(const value_type* s, size_type n, const allocator_type& a = allocator_type()); // constexpr since C++20
    basic_string(nullptr_t) = delete; // C++23
    basic_string(size_type n, value_type c, const allocator_type& a = allocator_type());        // constexpr since C++20
    template<class InputIterator>
        basic_string(InputIterator begin, InputIterator end,
                     const allocator_type& a = allocator_type());                               // constexpr since C++20
    template<container-compatible-range<charT> R>
      constexpr basic_string(from_range_t, R&& rg, const Allocator& a = Allocator());           // since C++23
    basic_string(initializer_list<value_type>, const Allocator& = Allocator());                 // constexpr since C++20
    basic_string(const basic_string&, const Allocator&);                                        // constexpr since C++20
    basic_string(basic_string&&, const Allocator&);                                             // constexpr since C++20

    ~basic_string();                                                                            // constexpr since C++20

    operator basic_string_view<charT, traits>() const noexcept;                                 // constexpr since C++20

    basic_string& operator=(const basic_string& str);                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           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