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std::isalnum<div class="t-tr-text">(Std :: locale)<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">(std::locale)</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div>

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< cpp‎ | locale

 
 
Lokalisierungen Bibliothek
Locales und Facetten
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Locales and facets
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locale
Buchstaben-Klassifikation
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Character classification
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Conversions
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Conversions
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Facet Kategorie Basisklassen
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Facet category base classes
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Facet Kategorien
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Facet categories
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Locale-spezifische Facetten
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Locale-specific facets
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Code-Konvertierung Facetten
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Code conversion facets
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codecvt_utf8(C++11)
codecvt_utf16(C++11)
C locale
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C locale
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Defined in header <locale>
template< class charT >
bool isalnum( charT ch, const locale& loc );
Prüft, ob die angegebene Zeichen als alphanumerische Zeichen von der angegebenen Ländereinstellung std::ctype Facette eingestuft .
Original:
Checks if the given character classified as an alphanumeric character by the given locale's std::ctype facet.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

ch -
Charakter
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character
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loc -
locale
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locale
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[Bearbeiten] Rückgabewert

Versandkosten true wenn der Charakter als alphanumerische eingestuft wird, false sonst .
Original:
Returns true if the character is classified as alphanumeric, false otherwise.
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[Bearbeiten] Mögliche Implementierung

template< class charT >
bool isalnum( charT ch, const std::locale& loc ) {
    return std::use_facet<std::ctype<charT>>(loc).is(std::ctype_base::alnum, ch);
}

[Bearbeiten] Beispiel

Veranschaulicht die Verwendung von isalnum () mit verschiedenen locales (OS-spezifische) .
Original:
Demonstrates the use of isalnum() with different locales (OS-specific).
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#include <iostream>
#include <locale>
int main()
{
    const wchar_t c = L'\u2135'; // mathematical symbol aleph
 
    std::locale loc1("C");
    std::cout << "isalnum('ℵ', C locale) returned "
               << std::boolalpha << std::isalnum(c, loc1) << '\n';
 
    std::locale loc2("en_US.UTF-8");
    std::cout << "isalnum('ℵ', Unicode locale) returned "
              << std::boolalpha << std::isalnum(c, loc2) << '\n';
}

Output:

isalpha('ℵ​', C locale) returned false
isalpha('ℵ', Unicode locale) returned true

[Bearbeiten] Siehe auch

prüft, ob ein Zeichen ist alphanumerisch
Original:
checks if a character is alphanumeric
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(Funktion) [edit]
prüft, ob eine breite Zeichen alphanumerisch
Original:
checks if a wide character is alphanumeric
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(Funktion) [edit]