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std::tolower(std::locale)

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Revision as of 22:10, 31 May 2013 by P12bot (Talk | contribs)

Defined in header <locale>
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

Parameters

ch - character
loc - locale

Return value

Returns the lowercase form of ch if one is listed in the locale, otherwise return ch unchanged.

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.

Possible implementation

template< class charT >
charT tolower( charT ch, const std::locale& loc ) {
    return std::use_facet<std::ctype<charT>>(loc).tolower(ch);
}

Example

See also

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