std::toupper(std::locale)
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Localization library
toupper
(C++11/17/26*)
(C++11/17/26*)
(C++11/17/26*)
(C++11/17/26*)
(C++11/17/26*)
(C++11/17/26*)
Defined in header
<locale>
template< class CharT >
CharT toupper( CharT ch, const locale& loc );
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
Run this code
#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