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std::mbsinit

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< cpp‎ | string‎ | multibyte

 
 
Strings Bibliothek
Null-terminierte Strings
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Null-terminated strings
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Byte-Strings
Multibyte-Strings
Wide Strings
Classes
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Classes
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basic_string
char_traits
 
Nullterminierten Multibyte Strings
Wide / Multibyte Konvertierungen
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Wide/multibyte conversions
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mbsinit
Types
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Types
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mbstate_t
 
Defined in header <cwchar>
int mbsinit( const std::mbstate_t* ps);
Wenn ps nicht ein NULL-Zeiger, bestimmt die mbsinit Funktion, ob die spitzen-to std::mbstate_t Objekt die anfängliche Wandlungspreis Zustand beschreibt .
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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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Inhaltsverzeichnis

[Bearbeiten] Notes

Obwohl eine Null initialisiert std::mbstate_t stellt immer die anfängliche Wandlungspreis Zustand, kann es andere Werte std::mbstate_t, die auch repräsentieren die anfängliche Wandlungspreis Zustand sein .
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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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[Bearbeiten] Parameter

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

[Bearbeiten] Rückgabewert

0 wenn ps ist kein Null-Zeiger und nicht reporesent die anfängliche Wandlungspreis Zustand Wert ungleich Null sonst .
Original:
0 if ps is not a null pointer and does not reporesent the initial conversion state, nonzero value otherwise.
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[Bearbeiten] Beispiel

#include <clocale>
#include <string>
#include <iostream>
#include <cwchar>
 
int main()
{
    // allow mbrlen() to work with UTF-8 multibyte encoding
    std::setlocale(LC_ALL, "en_US.utf8");
    // UTF-8 narrow multibyte encoding
    std::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

[Bearbeiten] Siehe auch

Konvertierungsstatus notwendigen Informationen, um Multibyte-Zeichenketten zu durchlaufen
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conversion state information necessary to iterate multibyte character strings
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(Klasse) [edit]
C documentation for mbsinit