std::towupper – cppreference.com

std::towupper

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

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

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

Nur 1:1 Zeichenzuordnung kann durch diese Funktion durchgeführt werden, zB die Großbuchstaben Form von 'ß' ist (mit einigen Ausnahmen) die Zwei-Zeichenkette "SS", die nicht durch std::towupper erzielt werden kann .
Original:
Only 1:1 character mapping can be performed by this function, e.g. the uppercase form of 'ß' is (with some exceptions) the two-character string "SS", which cannot be obtained by std::towupper.
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Beispiel

Der lateinische Buchstaben "s" (U 017 F) ist die Alternative Kleinbuchstaben Form von 'S' (U 0053)
Original:
The latin Buchstaben "s" (U 017 F) is the alternative lowercase form of 'S' (U+0053)
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#include <iostream>
#include <cwctype>
#include <clocale>

int main()
{
    wchar_t c = L'\u017f'; // Latin small letter Long S ('ſ')

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

Output: 

in the default locale, towupper(0x17f) = 0x17f
in Unicode locale, towupper(0x17f) = 0x53

Siehe auch