< cpp‎ | locale
Defined in header <locale>
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

template<class CharT>
CharT toupper(CharT ch, const std::locale& loc)
    return std::use_facet<std::ctype<CharT>>(loc).toupper(ch);

[edit] Example

#include <cwctype>
#include <iostream>
#include <locale>
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, toupper(" << (std::wint_t)c << ") = "
              << (std::wint_t)std::toupper(c, std::locale()) << '\n';
    std::cout << "in Unicode locale, toupper(" << (std::wint_t)c << ") = "
              << (std::wint_t)std::toupper(c, std::locale("en_US.utf8")) << '\n';

Possible output:

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

[edit] See also

converts a character to lowercase using the ctype facet of a locale
(function template) [edit]
converts a character to uppercase
(function) [edit]
converts a wide character to uppercase
(function) [edit]