| //===----------------------------------------------------------------------===// |
| // |
| // 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_CHAR_TRAITS_H |
| #define _LIBCPP___STRING_CHAR_TRAITS_H |
| |
| #include <__algorithm/copy_n.h> |
| #include <__algorithm/fill_n.h> |
| #include <__algorithm/find_end.h> |
| #include <__algorithm/find_first_of.h> |
| #include <__algorithm/min.h> |
| #include <__config> |
| #include <__functional/hash.h> |
| #include <__iterator/iterator_traits.h> |
| #include <cstdint> |
| #include <cstdio> |
| #include <cstring> |
| #include <iosfwd> |
| #include <type_traits> |
| |
| #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS |
| # include <cwchar> // for wmemcpy |
| #endif |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_PUSH_MACROS |
| #include <__undef_macros> |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template <class _CharT> |
| struct _LIBCPP_TEMPLATE_VIS char_traits |
| { |
| typedef _CharT char_type; |
| typedef int int_type; |
| typedef streamoff off_type; |
| typedef streampos pos_type; |
| typedef mbstate_t state_type; |
| |
| static inline void _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| assign(char_type& __c1, const char_type& __c2) _NOEXCEPT {__c1 = __c2;} |
| static inline _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT |
| {return __c1 == __c2;} |
| static inline _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT |
| {return __c1 < __c2;} |
| |
| static _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| int compare(const char_type* __s1, const char_type* __s2, size_t __n); |
| _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| size_t length(const char_type* __s); |
| _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| const char_type* find(const char_type* __s, size_t __n, const char_type& __a); |
| static _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| char_type* move(char_type* __s1, const char_type* __s2, size_t __n); |
| _LIBCPP_INLINE_VISIBILITY |
| static _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| char_type* copy(char_type* __s1, const char_type* __s2, size_t __n); |
| _LIBCPP_INLINE_VISIBILITY |
| static _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| char_type* assign(char_type* __s, size_t __n, char_type __a); |
| |
| static inline _LIBCPP_CONSTEXPR int_type not_eof(int_type __c) _NOEXCEPT |
| {return eq_int_type(__c, eof()) ? ~eof() : __c;} |
| static inline _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT |
| {return char_type(__c);} |
| static inline _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT |
| {return int_type(__c);} |
| static inline _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT |
| {return __c1 == __c2;} |
| static inline _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT |
| {return int_type(EOF);} |
| }; |
| |
| template <class _CharT> |
| _LIBCPP_CONSTEXPR_AFTER_CXX14 int |
| char_traits<_CharT>::compare(const char_type* __s1, const char_type* __s2, size_t __n) |
| { |
| for (; __n; --__n, ++__s1, ++__s2) |
| { |
| if (lt(*__s1, *__s2)) |
| return -1; |
| if (lt(*__s2, *__s1)) |
| return 1; |
| } |
| return 0; |
| } |
| |
| template <class _CharT> |
| inline |
| _LIBCPP_CONSTEXPR_AFTER_CXX14 size_t |
| char_traits<_CharT>::length(const char_type* __s) |
| { |
| size_t __len = 0; |
| for (; !eq(*__s, char_type(0)); ++__s) |
| ++__len; |
| return __len; |
| } |
| |
| template <class _CharT> |
| inline |
| _LIBCPP_CONSTEXPR_AFTER_CXX14 const _CharT* |
| char_traits<_CharT>::find(const char_type* __s, size_t __n, const char_type& __a) |
| { |
| for (; __n; --__n) |
| { |
| if (eq(*__s, __a)) |
| return __s; |
| ++__s; |
| } |
| return nullptr; |
| } |
| |
| template <class _CharT> |
| _LIBCPP_CONSTEXPR_AFTER_CXX17 _CharT* |
| char_traits<_CharT>::move(char_type* __s1, const char_type* __s2, size_t __n) |
| { |
| if (__n == 0) return __s1; |
| char_type* __r = __s1; |
| if (__s1 < __s2) |
| { |
| for (; __n; --__n, ++__s1, ++__s2) |
| assign(*__s1, *__s2); |
| } |
| else if (__s2 < __s1) |
| { |
| __s1 += __n; |
| __s2 += __n; |
| for (; __n; --__n) |
| assign(*--__s1, *--__s2); |
| } |
| return __r; |
| } |
| |
| template <class _CharT> |
| inline _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| _CharT* |
| char_traits<_CharT>::copy(char_type* __s1, const char_type* __s2, size_t __n) |
| { |
| if (!__libcpp_is_constant_evaluated()) { |
| _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range"); |
| } |
| char_type* __r = __s1; |
| for (; __n; --__n, ++__s1, ++__s2) |
| assign(*__s1, *__s2); |
| return __r; |
| } |
| |
| template <class _CharT> |
| inline _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| _CharT* |
| char_traits<_CharT>::assign(char_type* __s, size_t __n, char_type __a) |
| { |
| char_type* __r = __s; |
| for (; __n; --__n, ++__s) |
| assign(*__s, __a); |
| return __r; |
| } |
| |
| template <class _CharT> |
| static inline _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| _CharT* __char_traits_move(_CharT* __dest, const _CharT* __source, size_t __n) _NOEXCEPT |
| { |
| #ifdef _LIBCPP_COMPILER_GCC |
| if (__libcpp_is_constant_evaluated()) { |
| if (__n == 0) |
| return __dest; |
| _CharT* __allocation = new _CharT[__n]; |
| std::copy_n(__source, __n, __allocation); |
| std::copy_n(static_cast<const _CharT*>(__allocation), __n, __dest); |
| delete[] __allocation; |
| return __dest; |
| } |
| #endif |
| ::__builtin_memmove(__dest, __source, __n * sizeof(_CharT)); |
| return __dest; |
| } |
| |
| // char_traits<char> |
| |
| template <> |
| struct _LIBCPP_TEMPLATE_VIS char_traits<char> |
| { |
| typedef char char_type; |
| typedef int int_type; |
| typedef streamoff off_type; |
| typedef streampos pos_type; |
| typedef mbstate_t state_type; |
| |
| static inline _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT {__c1 = __c2;} |
| static inline _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT |
| {return __c1 == __c2;} |
| static inline _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT |
| {return (unsigned char)__c1 < (unsigned char)__c2;} |
| |
| static _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| int compare(const char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT; |
| |
| static inline size_t _LIBCPP_CONSTEXPR_AFTER_CXX14 length(const char_type* __s) _NOEXCEPT { |
| // GCC currently does not support __builtin_strlen during constant evaluation. |
| // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70816 |
| #ifdef _LIBCPP_COMPILER_GCC |
| if (__libcpp_is_constant_evaluated()) { |
| size_t __i = 0; |
| for (; __s[__i] != char_type('\0'); ++__i) |
| ; |
| return __i; |
| } |
| #endif |
| return __builtin_strlen(__s); |
| } |
| |
| static _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| const char_type* find(const char_type* __s, size_t __n, const char_type& __a) _NOEXCEPT; |
| |
| static inline _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| char_type* move(char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT { |
| return std::__char_traits_move(__s1, __s2, __n); |
| } |
| |
| static inline _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| char_type* copy(char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT { |
| if (!__libcpp_is_constant_evaluated()) |
| _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range"); |
| std::copy_n(__s2, __n, __s1); |
| return __s1; |
| } |
| |
| static inline _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| char_type* assign(char_type* __s, size_t __n, char_type __a) _NOEXCEPT { |
| std::fill_n(__s, __n, __a); |
| return __s; |
| } |
| |
| static inline _LIBCPP_CONSTEXPR int_type not_eof(int_type __c) _NOEXCEPT |
| {return eq_int_type(__c, eof()) ? ~eof() : __c;} |
| static inline _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT |
| {return char_type(__c);} |
| static inline _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT |
| {return int_type((unsigned char)__c);} |
| static inline _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT |
| {return __c1 == __c2;} |
| static inline _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT |
| {return int_type(EOF);} |
| }; |
| |
| inline _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| int |
| char_traits<char>::compare(const char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT |
| { |
| if (__n == 0) |
| return 0; |
| #if __has_feature(cxx_constexpr_string_builtins) |
| return __builtin_memcmp(__s1, __s2, __n); |
| #elif _LIBCPP_STD_VER <= 14 |
| return _VSTD::memcmp(__s1, __s2, __n); |
| #else |
| for (; __n; --__n, ++__s1, ++__s2) |
| { |
| if (lt(*__s1, *__s2)) |
| return -1; |
| if (lt(*__s2, *__s1)) |
| return 1; |
| } |
| return 0; |
| #endif |
| } |
| |
| inline _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| const char* |
| char_traits<char>::find(const char_type* __s, size_t __n, const char_type& __a) _NOEXCEPT |
| { |
| if (__n == 0) |
| return nullptr; |
| #if __has_feature(cxx_constexpr_string_builtins) |
| return __builtin_char_memchr(__s, to_int_type(__a), __n); |
| #elif _LIBCPP_STD_VER <= 14 |
| return (const char_type*) _VSTD::memchr(__s, to_int_type(__a), __n); |
| #else |
| for (; __n; --__n) |
| { |
| if (eq(*__s, __a)) |
| return __s; |
| ++__s; |
| } |
| return nullptr; |
| #endif |
| } |
| |
| |
| // char_traits<wchar_t> |
| |
| #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS |
| template <> |
| struct _LIBCPP_TEMPLATE_VIS char_traits<wchar_t> |
| { |
| typedef wchar_t char_type; |
| typedef wint_t int_type; |
| typedef streamoff off_type; |
| typedef streampos pos_type; |
| typedef mbstate_t state_type; |
| |
| static inline _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT {__c1 = __c2;} |
| static inline _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT |
| {return __c1 == __c2;} |
| static inline _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT |
| {return __c1 < __c2;} |
| |
| static _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| int compare(const char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT; |
| static _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| size_t length(const char_type* __s) _NOEXCEPT; |
| static _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| const char_type* find(const char_type* __s, size_t __n, const char_type& __a) _NOEXCEPT; |
| |
| static inline _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| char_type* move(char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT { |
| return std::__char_traits_move(__s1, __s2, __n); |
| } |
| |
| static inline _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| char_type* copy(char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT { |
| if (!__libcpp_is_constant_evaluated()) |
| _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range"); |
| std::copy_n(__s2, __n, __s1); |
| return __s1; |
| } |
| |
| static inline _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| char_type* assign(char_type* __s, size_t __n, char_type __a) _NOEXCEPT { |
| std::fill_n(__s, __n, __a); |
| return __s; |
| } |
| |
| static inline _LIBCPP_CONSTEXPR int_type not_eof(int_type __c) _NOEXCEPT |
| {return eq_int_type(__c, eof()) ? ~eof() : __c;} |
| static inline _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT |
| {return char_type(__c);} |
| static inline _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT |
| {return int_type(__c);} |
| static inline _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT |
| {return __c1 == __c2;} |
| static inline _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT |
| {return int_type(WEOF);} |
| }; |
| |
| inline _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| int |
| char_traits<wchar_t>::compare(const char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT |
| { |
| if (__n == 0) |
| return 0; |
| #if __has_feature(cxx_constexpr_string_builtins) |
| return __builtin_wmemcmp(__s1, __s2, __n); |
| #elif _LIBCPP_STD_VER <= 14 |
| return _VSTD::wmemcmp(__s1, __s2, __n); |
| #else |
| for (; __n; --__n, ++__s1, ++__s2) |
| { |
| if (lt(*__s1, *__s2)) |
| return -1; |
| if (lt(*__s2, *__s1)) |
| return 1; |
| } |
| return 0; |
| #endif |
| } |
| |
| inline _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| size_t |
| char_traits<wchar_t>::length(const char_type* __s) _NOEXCEPT |
| { |
| #if __has_feature(cxx_constexpr_string_builtins) |
| return __builtin_wcslen(__s); |
| #elif _LIBCPP_STD_VER <= 14 |
| return _VSTD::wcslen(__s); |
| #else |
| size_t __len = 0; |
| for (; !eq(*__s, char_type(0)); ++__s) |
| ++__len; |
| return __len; |
| #endif |
| } |
| |
| inline _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| const wchar_t* |
| char_traits<wchar_t>::find(const char_type* __s, size_t __n, const char_type& __a) _NOEXCEPT |
| { |
| if (__n == 0) |
| return nullptr; |
| #if __has_feature(cxx_constexpr_string_builtins) |
| return __builtin_wmemchr(__s, __a, __n); |
| #elif _LIBCPP_STD_VER <= 14 |
| return _VSTD::wmemchr(__s, __a, __n); |
| #else |
| for (; __n; --__n) |
| { |
| if (eq(*__s, __a)) |
| return __s; |
| ++__s; |
| } |
| return nullptr; |
| #endif |
| } |
| #endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS |
| |
| #ifndef _LIBCPP_HAS_NO_CHAR8_T |
| |
| template <> |
| struct _LIBCPP_TEMPLATE_VIS char_traits<char8_t> |
| { |
| typedef char8_t char_type; |
| typedef unsigned int int_type; |
| typedef streamoff off_type; |
| typedef u8streampos pos_type; |
| typedef mbstate_t state_type; |
| |
| static inline constexpr void assign(char_type& __c1, const char_type& __c2) noexcept |
| {__c1 = __c2;} |
| static inline constexpr bool eq(char_type __c1, char_type __c2) noexcept |
| {return __c1 == __c2;} |
| static inline constexpr bool lt(char_type __c1, char_type __c2) noexcept |
| {return __c1 < __c2;} |
| |
| static constexpr |
| int compare(const char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT; |
| |
| static constexpr |
| size_t length(const char_type* __s) _NOEXCEPT; |
| |
| _LIBCPP_INLINE_VISIBILITY static constexpr |
| const char_type* find(const char_type* __s, size_t __n, const char_type& __a) _NOEXCEPT; |
| |
| static _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| char_type* move(char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT { |
| return std::__char_traits_move(__s1, __s2, __n); |
| } |
| |
| static _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| char_type* copy(char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT { |
| if (!__libcpp_is_constant_evaluated()) |
| _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range"); |
| std::copy_n(__s2, __n, __s1); |
| return __s1; |
| } |
| |
| static _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| char_type* assign(char_type* __s, size_t __n, char_type __a) _NOEXCEPT { |
| std::fill_n(__s, __n, __a); |
| return __s; |
| } |
| |
| static inline constexpr int_type not_eof(int_type __c) noexcept |
| {return eq_int_type(__c, eof()) ? ~eof() : __c;} |
| static inline constexpr char_type to_char_type(int_type __c) noexcept |
| {return char_type(__c);} |
| static inline constexpr int_type to_int_type(char_type __c) noexcept |
| {return int_type(__c);} |
| static inline constexpr bool eq_int_type(int_type __c1, int_type __c2) noexcept |
| {return __c1 == __c2;} |
| static inline constexpr int_type eof() noexcept |
| {return int_type(EOF);} |
| }; |
| |
| // TODO use '__builtin_strlen' if it ever supports char8_t ?? |
| inline constexpr |
| size_t |
| char_traits<char8_t>::length(const char_type* __s) _NOEXCEPT |
| { |
| size_t __len = 0; |
| for (; !eq(*__s, char_type(0)); ++__s) |
| ++__len; |
| return __len; |
| } |
| |
| inline constexpr |
| int |
| char_traits<char8_t>::compare(const char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT |
| { |
| #if __has_feature(cxx_constexpr_string_builtins) |
| return __builtin_memcmp(__s1, __s2, __n); |
| #else |
| for (; __n; --__n, ++__s1, ++__s2) |
| { |
| if (lt(*__s1, *__s2)) |
| return -1; |
| if (lt(*__s2, *__s1)) |
| return 1; |
| } |
| return 0; |
| #endif |
| } |
| |
| // TODO use '__builtin_char_memchr' if it ever supports char8_t ?? |
| inline constexpr |
| const char8_t* |
| char_traits<char8_t>::find(const char_type* __s, size_t __n, const char_type& __a) _NOEXCEPT |
| { |
| for (; __n; --__n) |
| { |
| if (eq(*__s, __a)) |
| return __s; |
| ++__s; |
| } |
| return nullptr; |
| } |
| |
| #endif // _LIBCPP_HAS_NO_CHAR8_T |
| |
| template <> |
| struct _LIBCPP_TEMPLATE_VIS char_traits<char16_t> |
| { |
| typedef char16_t char_type; |
| typedef uint_least16_t int_type; |
| typedef streamoff off_type; |
| typedef u16streampos pos_type; |
| typedef mbstate_t state_type; |
| |
| static inline _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT {__c1 = __c2;} |
| static inline _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT |
| {return __c1 == __c2;} |
| static inline _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT |
| {return __c1 < __c2;} |
| |
| _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| int compare(const char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT; |
| _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| size_t length(const char_type* __s) _NOEXCEPT; |
| _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| const char_type* find(const char_type* __s, size_t __n, const char_type& __a) _NOEXCEPT; |
| |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| static char_type* move(char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT { |
| return std::__char_traits_move(__s1, __s2, __n); |
| } |
| |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| static char_type* copy(char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT { |
| if (!__libcpp_is_constant_evaluated()) |
| _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range"); |
| std::copy_n(__s2, __n, __s1); |
| return __s1; |
| } |
| |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| static char_type* assign(char_type* __s, size_t __n, char_type __a) _NOEXCEPT { |
| std::fill_n(__s, __n, __a); |
| return __s; |
| } |
| |
| static inline _LIBCPP_CONSTEXPR int_type not_eof(int_type __c) _NOEXCEPT |
| {return eq_int_type(__c, eof()) ? ~eof() : __c;} |
| static inline _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT |
| {return char_type(__c);} |
| static inline _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT |
| {return int_type(__c);} |
| static inline _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT |
| {return __c1 == __c2;} |
| static inline _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT |
| {return int_type(0xFFFF);} |
| }; |
| |
| inline _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| int |
| char_traits<char16_t>::compare(const char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT |
| { |
| for (; __n; --__n, ++__s1, ++__s2) |
| { |
| if (lt(*__s1, *__s2)) |
| return -1; |
| if (lt(*__s2, *__s1)) |
| return 1; |
| } |
| return 0; |
| } |
| |
| inline _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| size_t |
| char_traits<char16_t>::length(const char_type* __s) _NOEXCEPT |
| { |
| size_t __len = 0; |
| for (; !eq(*__s, char_type(0)); ++__s) |
| ++__len; |
| return __len; |
| } |
| |
| inline _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| const char16_t* |
| char_traits<char16_t>::find(const char_type* __s, size_t __n, const char_type& __a) _NOEXCEPT |
| { |
| for (; __n; --__n) |
| { |
| if (eq(*__s, __a)) |
| return __s; |
| ++__s; |
| } |
| return nullptr; |
| } |
| |
| template <> |
| struct _LIBCPP_TEMPLATE_VIS char_traits<char32_t> |
| { |
| typedef char32_t char_type; |
| typedef uint_least32_t int_type; |
| typedef streamoff off_type; |
| typedef u32streampos pos_type; |
| typedef mbstate_t state_type; |
| |
| static inline _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT {__c1 = __c2;} |
| static inline _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT |
| {return __c1 == __c2;} |
| static inline _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT |
| {return __c1 < __c2;} |
| |
| _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| int compare(const char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT; |
| _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| size_t length(const char_type* __s) _NOEXCEPT; |
| _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| const char_type* find(const char_type* __s, size_t __n, const char_type& __a) _NOEXCEPT; |
| |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| static char_type* move(char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT { |
| return std::__char_traits_move(__s1, __s2, __n); |
| } |
| |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| static char_type* copy(char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT { |
| std::copy_n(__s2, __n, __s1); |
| return __s1; |
| } |
| |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 |
| static char_type* assign(char_type* __s, size_t __n, char_type __a) _NOEXCEPT { |
| std::fill_n(__s, __n, __a); |
| return __s; |
| } |
| |
| static inline _LIBCPP_CONSTEXPR int_type not_eof(int_type __c) _NOEXCEPT |
| {return eq_int_type(__c, eof()) ? ~eof() : __c;} |
| static inline _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT |
| {return char_type(__c);} |
| static inline _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT |
| {return int_type(__c);} |
| static inline _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT |
| {return __c1 == __c2;} |
| static inline _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT |
| {return int_type(0xFFFFFFFF);} |
| }; |
| |
| inline _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| int |
| char_traits<char32_t>::compare(const char_type* __s1, const char_type* __s2, size_t __n) _NOEXCEPT |
| { |
| for (; __n; --__n, ++__s1, ++__s2) |
| { |
| if (lt(*__s1, *__s2)) |
| return -1; |
| if (lt(*__s2, *__s1)) |
| return 1; |
| } |
| return 0; |
| } |
| |
| inline _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| size_t |
| char_traits<char32_t>::length(const char_type* __s) _NOEXCEPT |
| { |
| size_t __len = 0; |
| for (; !eq(*__s, char_type(0)); ++__s) |
| ++__len; |
| return __len; |
| } |
| |
| inline _LIBCPP_CONSTEXPR_AFTER_CXX14 |
| const char32_t* |
| char_traits<char32_t>::find(const char_type* __s, size_t __n, const char_type& __a) _NOEXCEPT |
| { |
| for (; __n; --__n) |
| { |
| if (eq(*__s, __a)) |
| return __s; |
| ++__s; |
| } |
| return nullptr; |
| } |
| |
| // helper fns for basic_string and string_view |
| |
| // __str_find |
| template<class _CharT, class _SizeT, class _Traits, _SizeT __npos> |
| inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY |
| __str_find(const _CharT *__p, _SizeT __sz, |
| _CharT __c, _SizeT __pos) _NOEXCEPT |
| { |
| if (__pos >= __sz) |
| return __npos; |
| const _CharT* __r = _Traits::find(__p + __pos, __sz - __pos, __c); |
| if (__r == nullptr) |
| return __npos; |
| return static_cast<_SizeT>(__r - __p); |
| } |
| |
| template <class _CharT, class _Traits> |
| inline _LIBCPP_CONSTEXPR_AFTER_CXX11 const _CharT * |
| __search_substring(const _CharT *__first1, const _CharT *__last1, |
| const _CharT *__first2, const _CharT *__last2) _NOEXCEPT { |
| // Take advantage of knowing source and pattern lengths. |
| // Stop short when source is smaller than pattern. |
| const ptrdiff_t __len2 = __last2 - __first2; |
| if (__len2 == 0) |
| return __first1; |
| |
| ptrdiff_t __len1 = __last1 - __first1; |
| if (__len1 < __len2) |
| return __last1; |
| |
| // First element of __first2 is loop invariant. |
| _CharT __f2 = *__first2; |
| while (true) { |
| __len1 = __last1 - __first1; |
| // Check whether __first1 still has at least __len2 bytes. |
| if (__len1 < __len2) |
| return __last1; |
| |
| // Find __f2 the first byte matching in __first1. |
| __first1 = _Traits::find(__first1, __len1 - __len2 + 1, __f2); |
| if (__first1 == nullptr) |
| return __last1; |
| |
| // It is faster to compare from the first byte of __first1 even if we |
| // already know that it matches the first byte of __first2: this is because |
| // __first2 is most likely aligned, as it is user's "pattern" string, and |
| // __first1 + 1 is most likely not aligned, as the match is in the middle of |
| // the string. |
| if (_Traits::compare(__first1, __first2, __len2) == 0) |
| return __first1; |
| |
| ++__first1; |
| } |
| } |
| |
| template<class _CharT, class _SizeT, class _Traits, _SizeT __npos> |
| inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY |
| __str_find(const _CharT *__p, _SizeT __sz, |
| const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT |
| { |
| if (__pos > __sz) |
| return __npos; |
| |
| if (__n == 0) // There is nothing to search, just return __pos. |
| return __pos; |
| |
| const _CharT *__r = __search_substring<_CharT, _Traits>( |
| __p + __pos, __p + __sz, __s, __s + __n); |
| |
| if (__r == __p + __sz) |
| return __npos; |
| return static_cast<_SizeT>(__r - __p); |
| } |
| |
| |
| // __str_rfind |
| |
| template<class _CharT, class _SizeT, class _Traits, _SizeT __npos> |
| inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY |
| __str_rfind(const _CharT *__p, _SizeT __sz, |
| _CharT __c, _SizeT __pos) _NOEXCEPT |
| { |
| if (__sz < 1) |
| return __npos; |
| if (__pos < __sz) |
| ++__pos; |
| else |
| __pos = __sz; |
| for (const _CharT* __ps = __p + __pos; __ps != __p;) |
| { |
| if (_Traits::eq(*--__ps, __c)) |
| return static_cast<_SizeT>(__ps - __p); |
| } |
| return __npos; |
| } |
| |
| template<class _CharT, class _SizeT, class _Traits, _SizeT __npos> |
| inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY |
| __str_rfind(const _CharT *__p, _SizeT __sz, |
| const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT |
| { |
| __pos = _VSTD::min(__pos, __sz); |
| if (__n < __sz - __pos) |
| __pos += __n; |
| else |
| __pos = __sz; |
| const _CharT* __r = _VSTD::__find_end( |
| __p, __p + __pos, __s, __s + __n, _Traits::eq, |
| random_access_iterator_tag(), random_access_iterator_tag()); |
| if (__n > 0 && __r == __p + __pos) |
| return __npos; |
| return static_cast<_SizeT>(__r - __p); |
| } |
| |
| // __str_find_first_of |
| template<class _CharT, class _SizeT, class _Traits, _SizeT __npos> |
| inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY |
| __str_find_first_of(const _CharT *__p, _SizeT __sz, |
| const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT |
| { |
| if (__pos >= __sz || __n == 0) |
| return __npos; |
| const _CharT* __r = _VSTD::__find_first_of_ce |
| (__p + __pos, __p + __sz, __s, __s + __n, _Traits::eq ); |
| if (__r == __p + __sz) |
| return __npos; |
| return static_cast<_SizeT>(__r - __p); |
| } |
| |
| |
| // __str_find_last_of |
| template<class _CharT, class _SizeT, class _Traits, _SizeT __npos> |
| inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY |
| __str_find_last_of(const _CharT *__p, _SizeT __sz, |
| const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT |
| { |
| if (__n != 0) |
| { |
| if (__pos < __sz) |
| ++__pos; |
| else |
| __pos = __sz; |
| for (const _CharT* __ps = __p + __pos; __ps != __p;) |
| { |
| const _CharT* __r = _Traits::find(__s, __n, *--__ps); |
| if (__r) |
| return static_cast<_SizeT>(__ps - __p); |
| } |
| } |
| return __npos; |
| } |
| |
| |
| // __str_find_first_not_of |
| template<class _CharT, class _SizeT, class _Traits, _SizeT __npos> |
| inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY |
| __str_find_first_not_of(const _CharT *__p, _SizeT __sz, |
| const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT |
| { |
| if (__pos < __sz) |
| { |
| const _CharT* __pe = __p + __sz; |
| for (const _CharT* __ps = __p + __pos; __ps != __pe; ++__ps) |
| if (_Traits::find(__s, __n, *__ps) == nullptr) |
| return static_cast<_SizeT>(__ps - __p); |
| } |
| return __npos; |
| } |
| |
| |
| template<class _CharT, class _SizeT, class _Traits, _SizeT __npos> |
| inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY |
| __str_find_first_not_of(const _CharT *__p, _SizeT __sz, |
| _CharT __c, _SizeT __pos) _NOEXCEPT |
| { |
| if (__pos < __sz) |
| { |
| const _CharT* __pe = __p + __sz; |
| for (const _CharT* __ps = __p + __pos; __ps != __pe; ++__ps) |
| if (!_Traits::eq(*__ps, __c)) |
| return static_cast<_SizeT>(__ps - __p); |
| } |
| return __npos; |
| } |
| |
| |
| // __str_find_last_not_of |
| template<class _CharT, class _SizeT, class _Traits, _SizeT __npos> |
| inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY |
| __str_find_last_not_of(const _CharT *__p, _SizeT __sz, |
| const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT |
| { |
| if (__pos < __sz) |
| ++__pos; |
| else |
| __pos = __sz; |
| for (const _CharT* __ps = __p + __pos; __ps != __p;) |
| if (_Traits::find(__s, __n, *--__ps) == nullptr) |
| return static_cast<_SizeT>(__ps - __p); |
| return __npos; |
| } |
| |
| |
| template<class _CharT, class _SizeT, class _Traits, _SizeT __npos> |
| inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY |
| __str_find_last_not_of(const _CharT *__p, _SizeT __sz, |
| _CharT __c, _SizeT __pos) _NOEXCEPT |
| { |
| if (__pos < __sz) |
| ++__pos; |
| else |
| __pos = __sz; |
| for (const _CharT* __ps = __p + __pos; __ps != __p;) |
| if (!_Traits::eq(*--__ps, __c)) |
| return static_cast<_SizeT>(__ps - __p); |
| return __npos; |
| } |
| |
| template<class _Ptr> |
| inline _LIBCPP_INLINE_VISIBILITY |
| size_t __do_string_hash(_Ptr __p, _Ptr __e) |
| { |
| typedef typename iterator_traits<_Ptr>::value_type value_type; |
| return __murmur2_or_cityhash<size_t>()(__p, (__e-__p)*sizeof(value_type)); |
| } |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| _LIBCPP_POP_MACROS |
| |
| #endif // _LIBCPP___STRING_CHAR_TRAITS_H |
