std::tolower(std::locale) - cppreference.com (original) (raw)
| | | | | --------------------------------------------------------------------- | | | | template< class CharT >CharT tolower( CharT ch, const locale& loc ); | | |
Converts the character ch to lowercase if possible, using the conversion rules specified by the given locale's std::ctype facet.
Contents
[edit] Parameters
| ch | - | character |
|---|---|---|
| loc | - | locale |
[edit] Return value
Returns the lowercase form of ch if one is listed in the locale, otherwise return ch unchanged.
[edit] Notes
Only 1:1 character mapping can be performed by this function, e.g. the Greek uppercase letter 'Σ' has two lowercase forms, depending on the position in a word: 'σ' and 'ς'. A call to std::tolower cannot be used to obtain the correct lowercase form in this case.
[edit] Possible implementation
[edit] Example
Possible output:
in the default locale, tolower(0x190) = 0x190 in Unicode locale, tolower(0x190) = 0x25b