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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../ranges/../string/wide/towupper.html below:

std::towupper - cppreference.com

Converts the given wide character to uppercase, if possible.

If the value of ch is neither representable as a wchar_t nor equal to the value of the macro WEOF, the behavior is undefined.

Uppercase version of ch or unmodified ch if no uppercase version is listed in the current C locale.

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.

ISO 30112 specifies which pairs of Unicode characters are included in this mapping.

The latin letter 'Å¿' (U+017F) is the alternative lowercase form of 'S' (U+0053).

Output:

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

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