Namespace
Varianti

std::char_traits

Da cppreference.com.
< cpp‎ | string

 
 
Stringhe libreria
Null-stringhe terminate
Original:
Null-terminated strings
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Byte stringhe
Multibyte stringhe
Stringhe larghe
Classi
Original:
Classes
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basic_string
char_traits
 
std::char_traits
Membri funzioni
Original:
Member functions
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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;
La classe char_traits definisce il flusso e le proprietà operazione di stringa di tipo carattere, quali i tipi utilizzati per manipolare i caratteri e stringhe di caratteri, così come tutte le operazioni comuni per il tipo di carattere dato.
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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C'è template char_traits classe definita, che serve come base per istanziazioni espliciti. Soddisfa tutti i requisiti di concetto 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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Inoltre, diverse specializzazioni sono definiti per la maggior parte dei tipi di caratteri comuni che che deve specificare i seguenti membri:
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

Indice

[modifica] Membri tipi

Tipo
Original:
Type
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Definition
char_type CharT
int_type
di tipo intero che può contenere tutti i valori di char_type più EOF
Original:
an integer type that can hold all values of char_type plus EOF
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off_type
Implementazione definita
Original:
implementation-defined
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pos_type
Implementazione definita
Original:
implementation-defined
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state_type
Implementazione definita
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implementation-defined
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[modifica] Membri funzioni

[statico]
assegna un carattere
Original:
assigns a character
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(public static membro funzione) [edit]
[statico]
mette a confronto due personaggi
Original:
compares two characters
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(public static membro funzione) [edit]
[statico]
si sposta di una sequenza di caratteri su un altro
Original:
moves one character sequence onto another
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(public static membro funzione) [edit]
[statico]
copia una sequenza di caratteri
Original:
copies a character sequence
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(public static membro funzione) [edit]
[statico]
confronto lessicografico due sequenze di caratteri
Original:
lexicographically compares two character sequences
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(public static membro funzione) [edit]
[statico]
restituisce la lunghezza di una sequenza di caratteri
Original:
returns the length of a character sequence
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(public static membro funzione) [edit]
[statico]
finds a character in a character sequence
(public static membro funzione) [edit]
[statico]
converte int_type a char_type equivalenti
Original:
converts int_type to equivalent char_type
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(public static membro funzione) [edit]
[statico]
converte char_type a int_type equivalenti
Original:
converts char_type to equivalent int_type
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(public static membro funzione) [edit]
[statico]
confronta due valori int_type
Original:
compares two int_type values
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(public static membro funzione) [edit]
[statico]
restituisce un eof valore
Original:
returns an eof value
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(public static membro funzione) [edit]
[statico]
verifica se un personaggio è eof valore
Original:
checks whether a character is eof value
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(public static membro funzione) [edit]

[modifica] Esempio

Tratti di carattere definiti dall'utente può essere utilizzato per fornire 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

[modifica] Vedi anche

negozi e manipola sequenze di caratteri
Original:
stores and manipulates sequences of characters
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(classe template) [edit]