// Character Traits for use by standard string and iostream -*- C++ -*- // Copyright (C) 1997-2022 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 // . /** @file bits/char_traits.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{string} */ // // ISO C++ 14882: 21 Strings library // #ifndef _CHAR_TRAITS_H #define _CHAR_TRAITS_H 1 #pragma GCC system_header #include // For streampos #include // For WEOF, wmemmove, wmemset, etc. #if __cplusplus >= 201103L # include #endif #if __cplusplus >= 202002L # include # include #endif #ifndef _GLIBCXX_ALWAYS_INLINE # define _GLIBCXX_ALWAYS_INLINE inline __attribute__((__always_inline__)) #endif namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wstringop-overflow" #pragma GCC diagnostic ignored "-Wstringop-overread" #pragma GCC diagnostic ignored "-Warray-bounds" /** * @brief Mapping from character type to associated types. * * @note This is an implementation class for the generic version * of char_traits. It defines int_type, off_type, pos_type, and * state_type. By default these are unsigned long, streamoff, * streampos, and mbstate_t. Users who need a different set of * types, but who don't need to change the definitions of any function * defined in char_traits, can specialize __gnu_cxx::_Char_types * while leaving __gnu_cxx::char_traits alone. */ template struct _Char_types { typedef unsigned long int_type; typedef std::streampos pos_type; typedef std::streamoff off_type; typedef std::mbstate_t state_type; }; /** * @brief Base class used to implement std::char_traits. * * @note For any given actual character type, this definition is * probably wrong. (Most of the member functions are likely to be * right, but the int_type and state_type typedefs, and the eof() * member function, are likely to be wrong.) The reason this class * exists is so users can specialize it. Classes in namespace std * may not be specialized for fundamental types, but classes in * namespace __gnu_cxx may be. * * See https://gcc.gnu.org/onlinedocs/libstdc++/manual/strings.html#strings.string.character_types * for advice on how to make use of this class for @a unusual character * types. Also, check out include/ext/pod_char_traits.h. */ template struct char_traits { typedef _CharT char_type; typedef typename _Char_types<_CharT>::int_type int_type; typedef typename _Char_types<_CharT>::pos_type pos_type; typedef typename _Char_types<_CharT>::off_type off_type; typedef typename _Char_types<_CharT>::state_type state_type; #if __cpp_lib_three_way_comparison using comparison_category = std::strong_ordering; #endif static _GLIBCXX14_CONSTEXPR void assign(char_type& __c1, const char_type& __c2) { #if __cpp_constexpr_dynamic_alloc if (std::__is_constant_evaluated()) std::construct_at(__builtin_addressof(__c1), __c2); else #endif __c1 = __c2; } static _GLIBCXX_CONSTEXPR bool eq(const char_type& __c1, const char_type& __c2) { return __c1 == __c2; } static _GLIBCXX_CONSTEXPR bool lt(const char_type& __c1, const char_type& __c2) { return __c1 < __c2; } static _GLIBCXX14_CONSTEXPR int compare(const char_type* __s1, const char_type* __s2, std::size_t __n); static _GLIBCXX14_CONSTEXPR std::size_t length(const char_type* __s); static _GLIBCXX14_CONSTEXPR const char_type* find(const char_type* __s, std::size_t __n, const char_type& __a); static _GLIBCXX20_CONSTEXPR char_type* move(char_type* __s1, const char_type* __s2, std::size_t __n); static _GLIBCXX20_CONSTEXPR char_type* copy(char_type* __s1, const char_type* __s2, std::size_t __n); static _GLIBCXX20_CONSTEXPR char_type* assign(char_type* __s, std::size_t __n, char_type __a); static _GLIBCXX_CONSTEXPR char_type to_char_type(const int_type& __c) { return static_cast(__c); } static _GLIBCXX_CONSTEXPR int_type to_int_type(const char_type& __c) { return static_cast(__c); } static _GLIBCXX_CONSTEXPR bool eq_int_type(const int_type& __c1, const int_type& __c2) { return __c1 == __c2; } static _GLIBCXX_CONSTEXPR int_type eof() { return static_cast(_GLIBCXX_STDIO_EOF); } static _GLIBCXX_CONSTEXPR int_type not_eof(const int_type& __c) { return !eq_int_type(__c, eof()) ? __c : to_int_type(char_type()); } }; template _GLIBCXX14_CONSTEXPR int char_traits<_CharT>:: compare(const char_type* __s1, const char_type* __s2, std::size_t __n) { for (std::size_t __i = 0; __i < __n; ++__i) if (lt(__s1[__i], __s2[__i])) return -1; else if (lt(__s2[__i], __s1[__i])) return 1; return 0; } template _GLIBCXX14_CONSTEXPR std::size_t char_traits<_CharT>:: length(const char_type* __p) { std::size_t __i = 0; while (!eq(__p[__i], char_type())) ++__i; return __i; } template _GLIBCXX14_CONSTEXPR const typename char_traits<_CharT>::char_type* char_traits<_CharT>:: find(const char_type* __s, std::size_t __n, const char_type& __a) { for (std::size_t __i = 0; __i < __n; ++__i) if (eq(__s[__i], __a)) return __s + __i; return 0; } template _GLIBCXX20_CONSTEXPR typename char_traits<_CharT>::char_type* char_traits<_CharT>:: move(char_type* __s1, const char_type* __s2, std::size_t __n) { if (__n == 0) return __s1; #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) { #if __cpp_constexpr_dynamic_alloc // The overlap detection below fails due to PR c++/89074, // so use a temporary buffer instead. char_type* __tmp = new char_type[__n]; copy(__tmp, __s2, __n); copy(__s1, __tmp, __n); delete[] __tmp; #else // Use __builtin_constant_p to avoid comparing unrelated pointers. if (__builtin_constant_p(__s2 < __s1) && __s1 > __s2 && __s1 < (__s2 + __n)) { do { --__n; assign(__s1[__n], __s2[__n]); } while (__n > 0); } else copy(__s1, __s2, __n); #endif return __s1; } #endif __builtin_memmove(__s1, __s2, __n * sizeof(char_type)); return __s1; } template _GLIBCXX20_CONSTEXPR typename char_traits<_CharT>::char_type* char_traits<_CharT>:: copy(char_type* __s1, const char_type* __s2, std::size_t __n) { if (__n == 0) return __s1; #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) { for (std::size_t __i = 0; __i < __n; ++__i) std::construct_at(__s1 + __i, __s2[__i]); return __s1; } #endif __builtin_memcpy(__s1, __s2, __n * sizeof(char_type)); return __s1; } template _GLIBCXX20_CONSTEXPR typename char_traits<_CharT>::char_type* char_traits<_CharT>:: assign(char_type* __s, std::size_t __n, char_type __a) { #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) { for (std::size_t __i = 0; __i < __n; ++__i) std::construct_at(__s + __i, __a); return __s; } #endif if _GLIBCXX17_CONSTEXPR (sizeof(_CharT) == 1 && __is_trivial(_CharT)) { if (__n) { unsigned char __c; __builtin_memcpy(&__c, __builtin_addressof(__a), 1); __builtin_memset(__s, __c, __n); } } else { for (std::size_t __i = 0; __i < __n; ++__i) __s[__i] = __a; } return __s; } _GLIBCXX_END_NAMESPACE_VERSION } // namespace namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION #ifdef __cpp_lib_is_constant_evaluated // Unofficial macro indicating P1032R1 support in C++20 # define __cpp_lib_constexpr_char_traits 201811L #elif __cplusplus >= 201703L && _GLIBCXX_HAVE_IS_CONSTANT_EVALUATED // Unofficial macro indicating P0426R1 support in C++17 # define __cpp_lib_constexpr_char_traits 201611L #endif // 21.1 /** * @brief Basis for explicit traits specializations. * * @note For any given actual character type, this definition is * probably wrong. Since this is just a thin wrapper around * __gnu_cxx::char_traits, it is possible to achieve a more * appropriate definition by specializing __gnu_cxx::char_traits. * * See https://gcc.gnu.org/onlinedocs/libstdc++/manual/strings.html#strings.string.character_types * for advice on how to make use of this class for @a unusual character * types. Also, check out include/ext/pod_char_traits.h. */ template struct char_traits : public __gnu_cxx::char_traits<_CharT> { }; /// 21.1.3.1 char_traits specializations template<> struct char_traits { typedef char char_type; typedef int int_type; typedef streampos pos_type; typedef streamoff off_type; typedef mbstate_t state_type; #if __cpp_lib_three_way_comparison using comparison_category = strong_ordering; #endif static _GLIBCXX17_CONSTEXPR void assign(char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT { #if __cpp_constexpr_dynamic_alloc if (std::__is_constant_evaluated()) std::construct_at(__builtin_addressof(__c1), __c2); else #endif __c1 = __c2; } static _GLIBCXX_CONSTEXPR bool eq(const char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT { return __c1 == __c2; } static _GLIBCXX_CONSTEXPR bool lt(const char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT { // LWG 467. return (static_cast(__c1) < static_cast(__c2)); } static _GLIBCXX17_CONSTEXPR int compare(const char_type* __s1, const char_type* __s2, size_t __n) { if (__n == 0) return 0; #if __cplusplus >= 201703L if (std::__is_constant_evaluated()) { for (size_t __i = 0; __i < __n; ++__i) if (lt(__s1[__i], __s2[__i])) return -1; else if (lt(__s2[__i], __s1[__i])) return 1; return 0; } #endif return __builtin_memcmp(__s1, __s2, __n); } static _GLIBCXX17_CONSTEXPR size_t length(const char_type* __s) { #if __cplusplus >= 201703L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::length(__s); #endif return __builtin_strlen(__s); } static _GLIBCXX17_CONSTEXPR const char_type* find(const char_type* __s, size_t __n, const char_type& __a) { if (__n == 0) return 0; #if __cplusplus >= 201703L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::find(__s, __n, __a); #endif return static_cast(__builtin_memchr(__s, __a, __n)); } static _GLIBCXX20_CONSTEXPR char_type* move(char_type* __s1, const char_type* __s2, size_t __n) { if (__n == 0) return __s1; #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::move(__s1, __s2, __n); #endif return static_cast(__builtin_memmove(__s1, __s2, __n)); } static _GLIBCXX20_CONSTEXPR char_type* copy(char_type* __s1, const char_type* __s2, size_t __n) { if (__n == 0) return __s1; #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::copy(__s1, __s2, __n); #endif return static_cast(__builtin_memcpy(__s1, __s2, __n)); } static _GLIBCXX20_CONSTEXPR char_type* assign(char_type* __s, size_t __n, char_type __a) { if (__n == 0) return __s; #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::assign(__s, __n, __a); #endif return static_cast(__builtin_memset(__s, __a, __n)); } static _GLIBCXX_CONSTEXPR char_type to_char_type(const int_type& __c) _GLIBCXX_NOEXCEPT { return static_cast(__c); } // To keep both the byte 0xff and the eof symbol 0xffffffff // from ending up as 0xffffffff. static _GLIBCXX_CONSTEXPR int_type to_int_type(const char_type& __c) _GLIBCXX_NOEXCEPT { return static_cast(static_cast(__c)); } static _GLIBCXX_CONSTEXPR bool eq_int_type(const int_type& __c1, const int_type& __c2) _GLIBCXX_NOEXCEPT { return __c1 == __c2; } static _GLIBCXX_CONSTEXPR int_type eof() _GLIBCXX_NOEXCEPT { return static_cast(_GLIBCXX_STDIO_EOF); } static _GLIBCXX_CONSTEXPR int_type not_eof(const int_type& __c) _GLIBCXX_NOEXCEPT { return (__c == eof()) ? 0 : __c; } }; #ifdef _GLIBCXX_USE_WCHAR_T /// 21.1.3.2 char_traits specializations template<> struct char_traits { typedef wchar_t char_type; typedef wint_t int_type; typedef streamoff off_type; typedef wstreampos pos_type; typedef mbstate_t state_type; #if __cpp_lib_three_way_comparison using comparison_category = strong_ordering; #endif static _GLIBCXX17_CONSTEXPR void assign(char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT { #if __cpp_constexpr_dynamic_alloc if (std::__is_constant_evaluated()) std::construct_at(__builtin_addressof(__c1), __c2); else #endif __c1 = __c2; } static _GLIBCXX_CONSTEXPR bool eq(const char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT { return __c1 == __c2; } static _GLIBCXX_CONSTEXPR bool lt(const char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT { return __c1 < __c2; } static _GLIBCXX17_CONSTEXPR int compare(const char_type* __s1, const char_type* __s2, size_t __n) { if (__n == 0) return 0; #if __cplusplus >= 201703L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::compare(__s1, __s2, __n); #endif return wmemcmp(__s1, __s2, __n); } static _GLIBCXX17_CONSTEXPR size_t length(const char_type* __s) { #if __cplusplus >= 201703L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::length(__s); #endif return wcslen(__s); } static _GLIBCXX17_CONSTEXPR const char_type* find(const char_type* __s, size_t __n, const char_type& __a) { if (__n == 0) return 0; #if __cplusplus >= 201703L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::find(__s, __n, __a); #endif return wmemchr(__s, __a, __n); } static _GLIBCXX20_CONSTEXPR char_type* move(char_type* __s1, const char_type* __s2, size_t __n) { if (__n == 0) return __s1; #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::move(__s1, __s2, __n); #endif return wmemmove(__s1, __s2, __n); } static _GLIBCXX20_CONSTEXPR char_type* copy(char_type* __s1, const char_type* __s2, size_t __n) { if (__n == 0) return __s1; #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::copy(__s1, __s2, __n); #endif return wmemcpy(__s1, __s2, __n); } static _GLIBCXX20_CONSTEXPR char_type* assign(char_type* __s, size_t __n, char_type __a) { if (__n == 0) return __s; #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::assign(__s, __n, __a); #endif return wmemset(__s, __a, __n); } static _GLIBCXX_CONSTEXPR char_type to_char_type(const int_type& __c) _GLIBCXX_NOEXCEPT { return char_type(__c); } static _GLIBCXX_CONSTEXPR int_type to_int_type(const char_type& __c) _GLIBCXX_NOEXCEPT { return int_type(__c); } static _GLIBCXX_CONSTEXPR bool eq_int_type(const int_type& __c1, const int_type& __c2) _GLIBCXX_NOEXCEPT { return __c1 == __c2; } static _GLIBCXX_CONSTEXPR int_type eof() _GLIBCXX_NOEXCEPT { return static_cast(WEOF); } static _GLIBCXX_CONSTEXPR int_type not_eof(const int_type& __c) _GLIBCXX_NOEXCEPT { return eq_int_type(__c, eof()) ? 0 : __c; } }; #else // _GLIBCXX_USE_WCHAR_T template<> struct char_traits : public __gnu_cxx::char_traits { }; #endif //_GLIBCXX_USE_WCHAR_T #ifdef _GLIBCXX_USE_CHAR8_T template<> struct char_traits { typedef char8_t char_type; typedef unsigned int int_type; typedef u8streampos pos_type; typedef streamoff off_type; typedef mbstate_t state_type; #if __cpp_lib_three_way_comparison using comparison_category = strong_ordering; #endif static _GLIBCXX17_CONSTEXPR void assign(char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT { #if __cpp_constexpr_dynamic_alloc if (std::__is_constant_evaluated()) std::construct_at(__builtin_addressof(__c1), __c2); else #endif __c1 = __c2; } static _GLIBCXX_CONSTEXPR bool eq(const char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT { return __c1 == __c2; } static _GLIBCXX_CONSTEXPR bool lt(const char_type& __c1, const char_type& __c2) _GLIBCXX_NOEXCEPT { return __c1 < __c2; } static _GLIBCXX17_CONSTEXPR int compare(const char_type* __s1, const char_type* __s2, size_t __n) { if (__n == 0) return 0; #if __cplusplus >= 201703L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::compare(__s1, __s2, __n); #endif return __builtin_memcmp(__s1, __s2, __n); } static _GLIBCXX17_CONSTEXPR size_t length(const char_type* __s) { #if __cplusplus >= 201703L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::length(__s); #endif size_t __i = 0; while (!eq(__s[__i], char_type())) ++__i; return __i; } static _GLIBCXX17_CONSTEXPR const char_type* find(const char_type* __s, size_t __n, const char_type& __a) { if (__n == 0) return 0; #if __cplusplus >= 201703L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::find(__s, __n, __a); #endif return static_cast(__builtin_memchr(__s, __a, __n)); } static _GLIBCXX20_CONSTEXPR char_type* move(char_type* __s1, const char_type* __s2, size_t __n) { if (__n == 0) return __s1; #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::move(__s1, __s2, __n); #endif return static_cast(__builtin_memmove(__s1, __s2, __n)); } static _GLIBCXX20_CONSTEXPR char_type* copy(char_type* __s1, const char_type* __s2, size_t __n) { if (__n == 0) return __s1; #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::copy(__s1, __s2, __n); #endif return static_cast(__builtin_memcpy(__s1, __s2, __n)); } static _GLIBCXX20_CONSTEXPR char_type* assign(char_type* __s, size_t __n, char_type __a) { if (__n == 0) return __s; #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::assign(__s, __n, __a); #endif return static_cast(__builtin_memset(__s, __a, __n)); } static _GLIBCXX_CONSTEXPR char_type to_char_type(const int_type& __c) _GLIBCXX_NOEXCEPT { return char_type(__c); } static _GLIBCXX_CONSTEXPR int_type to_int_type(const char_type& __c) _GLIBCXX_NOEXCEPT { return int_type(__c); } static _GLIBCXX_CONSTEXPR bool eq_int_type(const int_type& __c1, const int_type& __c2) _GLIBCXX_NOEXCEPT { return __c1 == __c2; } static _GLIBCXX_CONSTEXPR int_type eof() _GLIBCXX_NOEXCEPT { return static_cast(-1); } static _GLIBCXX_CONSTEXPR int_type not_eof(const int_type& __c) _GLIBCXX_NOEXCEPT { return eq_int_type(__c, eof()) ? 0 : __c; } }; #endif //_GLIBCXX_USE_CHAR8_T _GLIBCXX_END_NAMESPACE_VERSION } // namespace #if __cplusplus >= 201103L #include namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION template<> struct char_traits { typedef char16_t char_type; #ifdef _GLIBCXX_USE_C99_STDINT_TR1 typedef uint_least16_t int_type; #elif defined __UINT_LEAST16_TYPE__ typedef __UINT_LEAST16_TYPE__ int_type; #else typedef make_unsigned::type int_type; #endif typedef streamoff off_type; typedef u16streampos pos_type; typedef mbstate_t state_type; #if __cpp_lib_three_way_comparison using comparison_category = strong_ordering; #endif static _GLIBCXX17_CONSTEXPR void assign(char_type& __c1, const char_type& __c2) noexcept { #if __cpp_constexpr_dynamic_alloc if (std::__is_constant_evaluated()) std::construct_at(__builtin_addressof(__c1), __c2); else #endif __c1 = __c2; } static constexpr bool eq(const char_type& __c1, const char_type& __c2) noexcept { return __c1 == __c2; } static constexpr bool lt(const char_type& __c1, const char_type& __c2) noexcept { return __c1 < __c2; } static _GLIBCXX17_CONSTEXPR int compare(const char_type* __s1, const char_type* __s2, size_t __n) { for (size_t __i = 0; __i < __n; ++__i) if (lt(__s1[__i], __s2[__i])) return -1; else if (lt(__s2[__i], __s1[__i])) return 1; return 0; } static _GLIBCXX17_CONSTEXPR size_t length(const char_type* __s) { size_t __i = 0; while (!eq(__s[__i], char_type())) ++__i; return __i; } static _GLIBCXX17_CONSTEXPR const char_type* find(const char_type* __s, size_t __n, const char_type& __a) { for (size_t __i = 0; __i < __n; ++__i) if (eq(__s[__i], __a)) return __s + __i; return 0; } static _GLIBCXX20_CONSTEXPR char_type* move(char_type* __s1, const char_type* __s2, size_t __n) { if (__n == 0) return __s1; #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::move(__s1, __s2, __n); #endif return (static_cast (__builtin_memmove(__s1, __s2, __n * sizeof(char_type)))); } static _GLIBCXX20_CONSTEXPR char_type* copy(char_type* __s1, const char_type* __s2, size_t __n) { if (__n == 0) return __s1; #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::copy(__s1, __s2, __n); #endif return (static_cast (__builtin_memcpy(__s1, __s2, __n * sizeof(char_type)))); } static _GLIBCXX20_CONSTEXPR char_type* assign(char_type* __s, size_t __n, char_type __a) { for (size_t __i = 0; __i < __n; ++__i) assign(__s[__i], __a); return __s; } static constexpr char_type to_char_type(const int_type& __c) noexcept { return char_type(__c); } static constexpr int_type to_int_type(const char_type& __c) noexcept { return __c == eof() ? int_type(0xfffd) : int_type(__c); } static constexpr bool eq_int_type(const int_type& __c1, const int_type& __c2) noexcept { return __c1 == __c2; } static constexpr int_type eof() noexcept { return static_cast(-1); } static constexpr int_type not_eof(const int_type& __c) noexcept { return eq_int_type(__c, eof()) ? 0 : __c; } }; template<> struct char_traits { typedef char32_t char_type; #ifdef _GLIBCXX_USE_C99_STDINT_TR1 typedef uint_least32_t int_type; #elif defined __UINT_LEAST32_TYPE__ typedef __UINT_LEAST32_TYPE__ int_type; #else typedef make_unsigned::type int_type; #endif typedef streamoff off_type; typedef u32streampos pos_type; typedef mbstate_t state_type; #if __cpp_lib_three_way_comparison using comparison_category = strong_ordering; #endif static _GLIBCXX17_CONSTEXPR void assign(char_type& __c1, const char_type& __c2) noexcept { #if __cpp_constexpr_dynamic_alloc if (std::__is_constant_evaluated()) std::construct_at(__builtin_addressof(__c1), __c2); else #endif __c1 = __c2; } static constexpr bool eq(const char_type& __c1, const char_type& __c2) noexcept { return __c1 == __c2; } static constexpr bool lt(const char_type& __c1, const char_type& __c2) noexcept { return __c1 < __c2; } static _GLIBCXX17_CONSTEXPR int compare(const char_type* __s1, const char_type* __s2, size_t __n) { for (size_t __i = 0; __i < __n; ++__i) if (lt(__s1[__i], __s2[__i])) return -1; else if (lt(__s2[__i], __s1[__i])) return 1; return 0; } static _GLIBCXX17_CONSTEXPR size_t length(const char_type* __s) { size_t __i = 0; while (!eq(__s[__i], char_type())) ++__i; return __i; } static _GLIBCXX17_CONSTEXPR const char_type* find(const char_type* __s, size_t __n, const char_type& __a) { for (size_t __i = 0; __i < __n; ++__i) if (eq(__s[__i], __a)) return __s + __i; return 0; } static _GLIBCXX20_CONSTEXPR char_type* move(char_type* __s1, const char_type* __s2, size_t __n) { if (__n == 0) return __s1; #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::move(__s1, __s2, __n); #endif return (static_cast (__builtin_memmove(__s1, __s2, __n * sizeof(char_type)))); } static _GLIBCXX20_CONSTEXPR char_type* copy(char_type* __s1, const char_type* __s2, size_t __n) { if (__n == 0) return __s1; #if __cplusplus >= 202002L if (std::__is_constant_evaluated()) return __gnu_cxx::char_traits::copy(__s1, __s2, __n); #endif return (static_cast (__builtin_memcpy(__s1, __s2, __n * sizeof(char_type)))); } static _GLIBCXX20_CONSTEXPR char_type* assign(char_type* __s, size_t __n, char_type __a) { for (size_t __i = 0; __i < __n; ++__i) assign(__s[__i], __a); return __s; } static constexpr char_type to_char_type(const int_type& __c) noexcept { return char_type(__c); } static constexpr int_type to_int_type(const char_type& __c) noexcept { return int_type(__c); } static constexpr bool eq_int_type(const int_type& __c1, const int_type& __c2) noexcept { return __c1 == __c2; } static constexpr int_type eof() noexcept { return static_cast(-1); } static constexpr int_type not_eof(const int_type& __c) noexcept { return eq_int_type(__c, eof()) ? 0 : __c; } }; #if __cpp_lib_three_way_comparison namespace __detail { template constexpr auto __char_traits_cmp_cat(int __cmp) noexcept { if constexpr (requires { typename _ChTraits::comparison_category; }) { using _Cat = typename _ChTraits::comparison_category; static_assert( !is_void_v> ); return static_cast<_Cat>(__cmp <=> 0); } else return static_cast(__cmp <=> 0); } } // namespace __detail #endif // C++20 #pragma GCC diagnostic pop _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif // C++11 #endif // _CHAR_TRAITS_H