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

std::towlower - cppreference.com

Converts the given wide character to lowercase, 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.

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

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.

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

Output:

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

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