std::towlower — cppreference.com

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Déclaré dans l'en-tête `<cwctype>`
`std::wint_t towlower( std::wint_t ch );`

Convertit le caractère large en minuscules, si possible .

Original:

Converts the given wide character to lowercase, if possible.

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Paramètres

caractère large à convertir

Original:

wide character to be converted

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Retourne la valeur

Version en minuscules ou ch ch non modifiée si aucune version en minuscules est répertorié dans la locale courante C .

Original:

Lowercase version of ch or unmodified ch if no lowercase version is listed in the current C locale.

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Notes

Seulement 1:1 mappage de caractères peut être effectuée par cette fonction, par exemple, la lettre majuscule grecque Σ 'a deux formes minuscules, en fonction de la position dans un mot: «σ» et «ς». Un appel à std::towlower ne peut pas être utilisé pour obtenir la forme correcte minuscules dans cette affaire .

Original:

Only 1:1 character mapping can be performed by this function, e.g. the Greek uppercase letter 'Σ' has two lowercase forms, depending on the position in a word: 'σ' and 'ς'. A call to std::towlower cannot be used to obtain the correct lowercase form in this case.

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Exemple

#include <iostream>
#include <cwctype>
#include <clocale>

int main()
{
    wchar_t c = L'\u0190'; // Latin capital open E ('Ɛ')

    std::cout << std::hex << std::showbase;
    std::cout << "in the default locale, towlower(" << (std::wint_t)c << ") = "
              << std::towlower(c) << '\n';
    std::setlocale(LC_ALL, "en_US.utf8");
    std::cout << "in Unicode locale, towlower(" << (std::wint_t)c << ") = "
              << std::towlower(c) << '\n';
}

Résultat :

in the default locale, towlower(0x190) = 0x190
in Unicode locale, towlower(0x190) = 0x25b

Voir aussi


towupper	convertit le caractère large en majuscules Original: converts a wide character to uppercase The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) [edit]

tolower(std::locale)	converts a character to lowercase using the ctype facet of a locale (fonction générique) [edit]

tolower	convertit un caractère en minuscule Original: converts a character to lowercase The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) [edit]

C documentation for towlower