std::char_traits

 

C++

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Потоки (C++11)

 

Строки

Нуль-терминальные строки

Однобайтовые строки

Многобайтовые строки

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Классы

basic_string

char_traits

 

std::char_traits

Член функций Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

char_traits::assign

char_traits::cmp

char_traits::move

char_traits::copy

char_traits::compare

char_traits::length

char_traits::find

char_traits::to_char_type

char_traits::to_int_type

char_traits::eq_int_type

char_traits::eof

char_traits::not_eof

 

Заголовочный файл <string>
template<     class CharT > class char_traits;

char_traits класс определяет поток и свойства строки работе тип характера, такие, как типы, используемые для манипулирования символов и строк, а также все основные операции для данного типа символов.

Original:

The char_traits class defines the stream and string operation properties of a character type, such as the types used for manipulating the characters and character strings, as well as all the common operations for the given character type.

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Существует шаблон класса char_traits определен, которая служит основой для явного экземпляров. Он отвечает всем требованиям концепции Traits.

Original:

There is class template char_traits defined, which serves as a basis for explicit instantiations. It fulfills all requirements of Traits concept.

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Кроме того, несколько специализаций определены для наиболее распространенных типов характера, который должен указать следующие элементы:

Original:

Also, several specializations are defined for most common character types which which has to specify the following members:

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Instantiation	char_type	int_type	off_type	pos_type	state_type
char_traits<char>	char	int	streamoff	streampos	mbstate_t
char_traits<wchar_t>	wchar_t	wint_t	wstreamoff	wstreampos	mbstate_t
char_traits<char16_t> (C++11)	char16_t	int_least16_t	streamoff	u16streampos	mbstate_t
char_traits<char32_t> (C++11)	char32_t	int_least32_t	streamoff	u32streampos	mbstate_t

Член типов

Type Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Definition
char_type	CharT
int_type	целого типа, который может вместить всех значений char_type плюс EOF Original: an integer type that can hold all values of char_type plus EOF The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
off_type	Определяется реализацией Original: implementation-defined The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
pos_type	Определяется реализацией Original: implementation-defined The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
state_type	Определяется реализацией Original: implementation-defined The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Член функций

assign [static]	назначает характер Original: assigns a character The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static функция-член)
eq lt [static]	сравнивает два символа Original: compares two characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static функция-член)
move [static]	перемещается на одну последовательность символов на другую Original: moves one character sequence onto another The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static функция-член)
copy [static]	копирует последовательность символов Original: copies a character sequence The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static функция-член)
compare [static]	лексикографически сравнивает две последовательности символов Original: lexicographically compares two character sequences The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static функция-член)
length [static]	возвращает длину символьной последовательности Original: returns the length of a character sequence The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static функция-член)
find [static]	finds a character in a character sequence (public static функция-член)
to_char_type [static]	преобразует int_type эквивалентные char_type Original: converts int_type to equivalent char_type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static функция-член)
to_int_type [static]	преобразует char_type эквивалентные int_type Original: converts char_type to equivalent int_type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static функция-член)
eq_int_type [static]	сравнивает два значения int_type Original: compares two int_type values The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static функция-член)
eof [static]	возвращает EOF' значение Original: returns an eof value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static функция-член)
not_eof [static]	проверки, является ли символ EOF' значение Original: checks whether a character is eof value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static функция-член)

Пример

Пользовательский черты характера могут быть использованы для обеспечения case-insensitive comparison

Original:

User-defined character traits may be used to provide case-insensitive comparison

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#include <string>
#include <iostream>
#include <cctype>
 
struct ci_char_traits : public std::char_traits<char> {
    static bool eq(char c1, char c2) {
         return std::toupper(c1) == std::toupper(c2);
     }
    static bool ne(char c1, char c2) {
         return std::toupper(c1) != std::toupper(c2);
     }
    static bool lt(char c1, char c2) {
         return std::toupper(c1) <  std::toupper(c2);
    }
    static int compare(const char* s1, const char* s2, size_t n) {
        while( n-- != 0 ) {
            if( std::toupper(*s1) < std::toupper(*s2) ) return -1;
            if( std::toupper(*s1) > std::toupper(*s2) ) return 1;
            ++s1; ++s2;
        }
        return 0;
    }
    static const char* find(const char* s, int n, char a) {
        while( n-- > 0 && std::toupper(*s) != std::toupper(a) ) {
            ++s;
        }
        return s;
    }
};
 
typedef std::basic_string<char, ci_char_traits> ci_string;
 
std::ostream& operator<<(std::ostream& os, const ci_string& str) {
    return os.write(str.data(), str.size());
}
 
int main()
{
    ci_string s1 = "Hello";
    ci_string s2 = "heLLo";
    if(s1 == s2)
        std::cout << s1 << " and " << s2 << " are equal\n";
}

Вывод:

Hello and heLLo are equal

См. также

basic_string	магазины и манипулирует последовательности символов Original: stores and manipulates sequences of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (шаблон класса)