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std::isalpha<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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<metanoindex/>

<tbody> </tbody>

Elemento definito nell'header

<locale>

template< class charT > bool isalpha( charT ch, const locale& loc );

Controlla se il carattere dato classificata come un carattere alfabetico dalla sfaccettatura std::ctype impostazioni internazionali di data.

Original:

Checks if the given character classified as an alphabetic character by the given locale's std::ctype facet.

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Parametri

ch -

carattere

Original:

character

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loc -

locale

Original:

locale

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Valore di ritorno

Restituisce true se il personaggio è classificato come alfabetico, false altrimenti.

Original:

Returns true if the character is classified as alphabetic, false otherwise.

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Possibile implementazione

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

Esempio

Viene illustrato l'utilizzo di isalpha () con diverse impostazioni internazionali (OS-specifico) .

Original:

Demonstrates the use of isalpha() with different locales (OS-specific).

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#include <iostream>
#include <locale>
int main()
{
    const wchar_t c = L'\u042f'; // cyrillic capital letter ya

    std::locale loc1("C");
    std::cout << "isalpha('Я​', C locale) returned "
               << std::boolalpha << std::isalpha(c, loc1) << '\n';

    std::locale loc2("en_US.UTF8");
    std::cout << "isalpha('Я', Unicode locale) returned "
              << std::boolalpha << std::isalpha(c, loc2) << '\n';
}

Output:

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

Vedi anche

Verifica se un carattere è alfabetico

Original:

checks if a character is alphabetic

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(funzione) [modifica]

Verifica se un carattere esteso è alfabetico

Original:

checks if a wide character is alphabetic

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(funzione) [modifica]