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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../../cpp/locale/tolower.html below:

std::tolower(std::locale) - cppreference.com

template< class CharT >
CharT tolower( CharT ch, const locale& loc );

Converts the character ch to lowercase if possible, using the conversion rules specified by the given locale's std::ctype facet.

[edit] Parameters ch - character loc - locale [edit] Return value

Returns the lowercase form of ch if one is listed in the locale, otherwise return ch unchanged.

[edit] Notes

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::tolower cannot be used to obtain the correct lowercase form in this case.

[edit] Possible implementation [edit] Example

Possible output:

in the default locale, tolower(0x190) = 0x190
in Unicode locale, tolower(0x190) = 0x25b
[edit] See also

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