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

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

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

Converts the character ch to uppercase 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 uppercase form of ch if one is listed in the locale, otherwise returns ch unchanged.

[edit] Notes

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::toupper.

[edit] Possible implementation [edit] Example

Possible output:

in the default locale, toupper(0x17f) = 0x17f
in Unicode locale, toupper(0x17f) = 0x53
[edit] See also

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