std::towupper - cppreference.com (original) (raw)
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.
[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).
Output:
in the default locale, towupper(0x17f) = 0x17f in Unicode locale, towupper(0x17f) = 0x53