std::char_traits

 

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字符串库

null结尾的字符串 Original: Null-terminated strings The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

字节的字符串

多字节字符串

宽字符串

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

basic_string

char_traits

 

std::char_traits

成员函数 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

 

Defined in header <string>
template<     class CharT > class char_traits;

。 char_traits类定义的字符类型，如用于操作为给定的字符类型的字符和字符的字符串，以及所有的共同操作的类型的流和字符串操作属性.

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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。有类定义的模板char_traits，作为显式实例化的基础。它满足所有要求的Traits概念.

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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。此外，一些专业被定义为最常见的字符类型，必须指定以下成员。

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

。会员类型。

。类型。 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	。整数类型，可以容纳所有值char_type加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	。 “实现自定义”。 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	。 “实现自定义”。 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	。 “实现自定义”。 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.

。成员函数。

assign [静态的] </ SPAN></div></div>	指定一个字符 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. （公共静态成员函数）
eq lt [静态的] </ SPAN></div></div>	比较两个字符 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. （公共静态成员函数）
move [静态的] </ SPAN></div></div>	到另一个移动一个字符序列 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. （公共静态成员函数）
copy [静态的] </ SPAN></div></div>	复制的字符序列 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. （公共静态成员函数）
compare [静态的] </ SPAN></div></div>	按字典顺序比较两个字符的序列 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. （公共静态成员函数）
length [静态的] </ SPAN></div></div>	返回一个字符序列的长度 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. （公共静态成员函数）
find [静态的] </ SPAN></div></div>	finds a character in a character sequence （公共静态成员函数）
to_char_type [静态的] </ SPAN></div></div>	转换为等效的int_typechar_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. （公共静态成员函数）
to_int_type [静态的] </ SPAN></div></div>	转换为等效的char_typeint_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. （公共静态成员函数）
eq_int_type [静态的] </ SPAN></div></div>	比较两个int_type值 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. （公共静态成员函数）
eof [静态的] </ SPAN></div></div>	返回一个“EOF”值 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. （公共静态成员函数）
not_eof [静态的] </ SPAN></div></div>	检查字符是否是“EOF”值 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. （公共静态成员函数）

。为例。

。用户定义的性格特征，可用于提供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";
}

Output:

Hello and heLLo are equal

。另请参阅。

basic_string	存储和处理的字符序列 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. （类模板）