std::towupper
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Null-terminated wide strings
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Defined in header
<cwctype>
std::wint_t towupper( std::wint_t ch );
Converts the given wide character to uppercase, 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.
Contents
[edit] Parameters
ch
-
wide character to be converted
[edit] Return value
Uppercase version of ch or unmodified ch if no uppercase version is listed in the current C locale.
[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::towupper.
ISO 30112 specifies which pairs of Unicode characters are included in this mapping.
[edit] Example
The latin letter 's' (U+017F) is the alternative lowercase form of 'S' (U+0053).
Run this code
#include <clocale> #include <cwctype> #include <iostream> 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, towupper(" << static_cast<std::wint_t >(c) << ") = " << std::towupper(c) << '\n'; std::setlocale (LC_ALL, "en_US.utf8"); std::cout << "in Unicode locale, towupper(" << static_cast<std::wint_t >(c) << ") = " << std::towupper(c) << '\n'; }
Output:
in the default locale, towupper(0x17f) = 0x17f in Unicode locale, towupper(0x17f) = 0x53
[edit] See also
C documentation for towupper