// -*- C++ -*-
//===--------------------------- string -----------------------------------===//
//
// 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

/*
    string synopsis

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
{
    typedef charT     char_type;
    typedef ...       int_type;
    typedef streamoff off_type;
    typedef streampos pos_type;
    typedef mbstate_t state_type;

    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<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);
    explicit basic_string(const allocator_type& a);
    basic_string(const basic_string& str);
    basic_string(basic_string&& str)
        noexcept(is_nothrow_move_constructible<allocator_type>::value);
    basic_string(const basic_string& str, size_type pos,
                 const allocator_type& a = allocator_type());
    basic_string(const basic_string& str, size_type pos, size_type n,
                 const Allocator& a = Allocator());
    template<class T>
        basic_string(const T& t, size_type pos, size_type n, const Allocator& a = Allocator()); // C++17
    template <class T>
        explicit basic_string(const T& t, const Allocator& a = Allocator()); // C++17
    basic_string(const value_type* s, const allocator_type& a = allocator_type());
    basic_string(const value_type* s, size_type n, const allocator_type& a = allocator_type());
    basic_string(size_type n, value_type c, const allocator_type& a = allocator_type());
    template<class InputIterator>
        basic_string(InputIterator begin, InputIterator end,
                     const allocator_type& a = allocator_type());
    basic_string(initializer_list<value_type>, const Allocator& = Allocator());
    basic_string(const basic_string&, const Allocator&);
    basic_string(basic_string&&, const Allocator&);

    ~basic_string();

    operator basic_string_view<charT, traits>() const noexcept;

    basic_string& operator=(const basic_string& str);
    template <class T>
        basic_string& operator=(const T& t); // C++17
    basic_string& operator=(basic_string&& str)
        noexcept(
             allocator_type::propagate_on_container_move_assignment::value ||
             allocator_type::is_always_equal::value ); // C++17
    basic_string& operator=(const value_type* s);
    basic_string& operator=(value_type c);
    basic_string& operator=(initializer_list<value_type>);

    iterator       begin() noexcept;
    const_iterator begin() const noexcept;
    iterator       end() noexcept;
    const_iterator end() const noexcept;

    reverse_iterator       rbegin() noexcept;
    const_reverse_iterator rbegin() const noexcept;
    reverse_iterator       rend() noexcept;
    const_reverse_iterator rend() const noexcept;

    const_iterator         cbegin() const noexcept;
    const_iterator         cend() const noexcept;
    const_reverse_iterator crbegin() const noexcept;
    const_reverse_iterator crend() const noexcept;

    size_type size() const noexcept;
    size_type length() const noexcept;
    size_type max_size() const noexcept;
    size_type capacity() const noexcept;

    void resize(size_type n, value_type c);
    void resize(size_type n);

    void reserve(size_type res_arg = 0);
    void shrink_to_fit();
    void clear() noexcept;
    bool empty() const noexcept;

    const_reference operator[](size_type pos) const;
    reference       operator[](size_type pos);

    const_reference at(size_type n) const;
    reference       at(size_type n);

    basic_string& operator+=(const basic_string& str);
    template <class T>
        basic_string& operator+=(const T& t);              // C++17
    basic_string& operator+=(const value_type* s);
    basic_string& operator+=(value_type c);
    basic_string& operator+=(initializer_list<value_type>);

    basic_string& append(const basic_string& str);
    template <class T>
        basic_string& append(const T& t);                 // C++17
    basic_string& append(const basic_string& str, size_type pos, size_type n=npos); //C++14
    template <class T>
        basic_string& append(const T& t, size_type pos, size_type n=npos); // C++17
    basic_string& append(const value_type* s, size_type n);
    basic_string& append(const value_type* s);
    basic_string& append(size_type n, value_type c);
    template<class InputIterator>
        basic_string& append(InputIterator first, InputIterator last);
    basic_string& append(initializer_list<value_type>);

    void push_back(value_type c);
    void pop_back();
    reference       front();
    const_reference front() const;
    reference       back();
    const_reference back() const;

    basic_string& assign(const basic_string& str);
    template <class T>
        basic_string& assign(const T& t);  // C++17
    basic_string& assign(basic_string&& str);
    basic_string& assign(const basic_string& str, size_type pos, size_type n=npos); // C++14
    template <class T>
        basic_string& assign(const T& t, size_type pos, size_type n=npos); // C++17
    basic_string& assign(const value_type* s, size_type n);
    basic_string& assign(const value_type* s);
    basic_string& assign(size_type n, value_type c);
    template<class InputIterator>
        basic_string& assign(InputIterator first, InputIterator last);
    basic_string& assign(initializer_list<value_type>);

    basic_string& insert(size_type pos1, const basic_string& str);
    template <class T>
        basic_string& insert(size_type pos1, const T& t);
    basic_string& insert(size_type pos1, const basic_string& str,
                         size_type pos2, size_type n);
    template <class T>
        basic_string& insert(size_type pos1, const T& t, size_type pos2, size_type n); // C++17
    basic_string& insert(size_type pos, const value_type* s, size_type n=npos); //C++14
    basic_string& insert(size_type pos, const value_type* s);
    basic_string& insert(size_type pos, size_type n, value_type c);
    iterator      insert(const_iterator p, value_type c);
    iterator      insert(const_iterator p, size_type n, value_type c);
    template<class InputIterator>
        iterator insert(const_iterator p, InputIterator first, InputIterator last);
    iterator      insert(const_iterator p, initializer_list<value_type>);

    basic_string& erase(size_type pos = 0, size_type n = npos);
    iterator      erase(const_iterator position);
    iterator      erase(const_iterator first, const_iterator last);

    basic_string& replace(size_type pos1, size_type n1, const basic_string& str);
    template <class T>
    basic_string& replace(size_type pos1, size_type n1, const T& t);  // C++17
    basic_string& replace(size_type pos1, size_type n1, const basic_string& str,
                          size_type pos2, size_type n2=npos); // C++14
    template <class T>
        basic_string& replace(size_type pos1, size_type n1, const T& t,
                              size_type pos2, size_type n); // C++17
    basic_string& replace(size_type pos, size_type n1, const value_type* s, size_type n2);
    basic_string& replace(size_type pos, size_type n1, const value_type* s);
    basic_string& replace(size_type pos, size_type n1, size_type n2, value_type c);
    basic_string& replace(const_iterator i1, const_iterator i2, const basic_string& str);
    template <class T>
        basic_string& replace(const_iterator i1, const_iterator i2, const T& t);  // C++17
    basic_string& replace(const_iterator i1, const_iterator i2, const value_type* s, size_type n);
    basic_string& replace(const_iterator i1, const_iterator i2, const value_type* s);
    basic_string& replace(const_iterator i1, const_iterator i2, size_type n, value_type c);
    template<class InputIterator>
        basic_string& replace(const_iterator i1, const_iterator i2, InputIterator j1, InputIterator j2);
    basic_string& replace(const_iterator i1, const_iterator i2, initializer_list<value_type>)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           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