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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

 
 
Biblioteca localizações
Localidades e facetas
Original:
Locales and facets
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locale
Classificação de caracteres
Original:
Character classification
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Conversões
Original:
Conversions
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Facet classes base da categoria
Original:
Facet category base classes
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Categorias faceta
Original:
Facet categories
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Específicos da localidade facetas
Original:
Locale-specific facets
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Facetas de conversão de código
Original:
Code conversion facets
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codecvt_utf8(C++11)
codecvt_utf16(C++11)
C localidade
Original:
C locale
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Defined in header <locale>
template< class charT >
bool isalnum( charT ch, const locale& loc );
Verifica se o caráter dado classificado como um caractere alfanumérico pela faceta determinada localidade de std::ctype.
Original:
Checks if the given character classified as an alphanumeric character by the given locale's std::ctype facet.
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Índice

[editar] Parâmetros

ch -
personagem
Original:
character
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loc -
localidade
Original:
locale
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[editar] Valor de retorno

Retorna true se o personagem é classificado como alfanumérico, false outra forma.
Original:
Returns true if the character is classified as alphanumeric, false otherwise.
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[editar] Possível implementação

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);
}

[editar] Exemplo

Demonstra o uso de isalnum () com diferentes localidades (OS-específica) .
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

[editar] Veja também

checa se o personagem é alfanumérico
Original:
checks if a character is alphanumeric
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(função) [edit]
verifica se um caractere largo é alfanumérico
Original:
checks if a wide character is alphanumeric
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(função) [edit]