std::towlower – cppreference.com

std::towlower

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<tbody> </tbody>
definiert in Header <cwctype>
std::wint_t towlower( std::wint_t ch );
Konvertiert das angegebene wide character in Kleinbuchstaben, wenn möglich .
Original:
Converts the given wide character to lowercase, if possible.
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Parameter

ch -
breites Zeichen umgewandelt werden
Original:
wide character to be converted
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Rückgabewert

Kleinbuchstaben Version ch oder unmodifizierte ch wenn keine Kleinbuchstaben Version wird in der aktuellen C locale aufgeführt .
Original:
Lowercase version of ch or unmodified ch if no lowercase version is listed in the current C locale.
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Notes

Nur 1:1 Zeichenzuordnung kann durch diese Funktion durchgeführt werden, zB der griechische Großbuchstabe 'Σ' hat zwei Kleinbuchstaben Formen, abhängig von der Position in einem Wort: "σ" und "ς". Ein Aufruf std::towlower kann nicht verwendet werden, um die korrekte Kleinbuchstaben Form in diesem Fall zu erhalten .
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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Beispiel

#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';
}

Output: 

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

Siehe auch