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std::towlower

De cppreference.com
< cpp‎ | string‎ | wide

 
 
Bibliothèque de chaînes de caractères
Chaînes à zéro terminal
Original:
Null-terminated strings
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Les chaînes d'octets
Chaines multi-octets
Les chaînes étendues
Classes
Original:
Classes
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basic_string
char_traits
 
Chaînes à zéro terminal de large
Fonctions
Original:
Functions
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Manipulation caractère
Original:
Character manipulation
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Conversion aux formats numériques
Original:
Conversions to numeric formats
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La manipulation de chaînes
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String manipulation
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La manipulation des tableaux
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Array manipulation
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wmemcpy
wmemmove
wmemcmp
wmemchr
wmemset
 
Defined in header <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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Sommaire

[modifier] Paramètres

ch -
caractère large à convertir
Original:
wide character to be converted
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[modifier] 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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[modifier] 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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[modifier] 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

[modifier] Voir aussi

convertit le caractère large en majuscules
Original:
converts a wide character to uppercase
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(fonction) [edit]
converts a character to lowercase using the ctype facet of a locale
(fonction générique) [edit]
convertit un caractère en minuscule
Original:
converts a character to lowercase
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(fonction) [edit]
C documentation for towlower