std::mbsinit

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< cpp‎ | string‎ | multibyte

 
 
Stringhe libreria
Null-stringhe terminate
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Null-terminated strings
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Byte stringhe
Multibyte stringhe
Stringhe larghe
Classi
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Classes
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basic_string
char_traits
 
Stringhe multibyte null-terminated
Wide / multibyte conversioni
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Wide/multibyte conversions
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mbsinit
Tipi
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Types
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mbstate_t
 
Elemento definito nell'header <cwchar>
int mbsinit(conststd::mbstate_t* ps);
ps se non è un puntatore nullo, la funzione mbsinit determina se l'oggetto appuntito a std::mbstate_t descrive lo stato iniziale di conversione.
Original:
If ps is not a null pointer, the mbsinit function determines whether the pointed-to std::mbstate_t object describes the initial conversion state.
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Indice

[modifica]Note

Sebbene un inizializzati a zero std::mbstate_t sempre rappresenta lo stato iniziale di conversione, vi possono essere altri valori di std::mbstate_t che ne rappresentano anche lo stato iniziale di conversione.
Original:
Although a zero-initialized std::mbstate_t always represents the initial conversion state, there may be other values of std::mbstate_t that also represent the initial conversion state.
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[modifica]Parametri

ps - pointer to the std::mbstate_t object to examine

[modifica]Valore di ritorno

0ps se non è un puntatore nullo e non reporesent stato iniziale di conversione, il valore zero altrimenti.
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0 if ps is not a null pointer and does not reporesent the initial conversion state, nonzero value otherwise.
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[modifica]Esempio

#include <clocale>#include <string>#include <iostream>#include <cwchar>   int main(){// allow mbrlen() to work with UTF-8 multibyte encodingstd::setlocale(LC_ALL, "en_US.utf8");// UTF-8 narrow multibyte encodingstd::string str = u8"水";// or u8"\u6c34" or "\xe6\xb0\xb4"std::mbstate_t mb =std::mbstate_t();(void)std::mbrlen(&str[0], 1, &mb);if(!std::mbsinit(&mb)){std::cout<<"After processing the first 1 byte of "<< str <<" the conversion state is not initial\n";}   (void)std::mbrlen(&str[1], str.size()-1, &mb);if(std::mbsinit(&mb)){std::cout<<"After processing the remaining 2 bytes of "<< str <<", the conversion state is initial conversion state\n";}}

Output:

After processing the first 1 byte of 水 the conversion state is not initial After processing the remaining 2 bytes of 水, the conversion state is initial conversion state

[modifica]Vedi anche

informazioni sullo stato di conversione necessario per scorrere le stringhe di caratteri multibyte
Original:
conversion state information necessary to iterate multibyte character strings
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(classe)[modifica]
C documentation for mbsinit
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