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std::towlower(3) C++ Standard Libary std::towlower(3) NAME std::towlower - std::towlower Synopsis Defined in header <cwctype> std::wint_t towlower( std::wint_t ch ); Converts the given wide character to lowercase, 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. Parameters ch - wide character to be converted Return value Lowercase version of ch or unmodified ch if no lowercase version is listed in the current C locale. Notes Only 1:1 character mapping can be performed by this function, e.g. the Greek uppercase letter '' has two lowercase forms, depending on the posi- tion in a word: '' and ''. A call to std::towlower cannot be used to obtain the cor- rect lowercase form in this case. ISO 30112 specifies which pairs of Unicode characters are included in this mapping. Example // Run this code #include <iostream> #include <cwctype> #include <clocale> int main() { wchar_t c = L'\u0190'; // Latin capital open E ('') std::cout << std::hex << std::showbase; std::cout << "in the default locale, towlower(" << (std::wint_t)c << ") = " << std::towlower(c) << '\n'; std::setlocale(LC_ALL, "en_US.utf8"); std::cout << "in Unicode locale, towlower(" << (std::wint_t)c << ") = " << std::towlower(c) << '\n'; } Output: in the default locale, towlower(0x190) = 0x190 in Unicode locale, towlower(0x190) = 0x25b See also towupper converts a wide character to uppercase (function) converts a character to lowercase using the ctype facet of a tolower(std::locale) locale (function template) tolower converts a character to lowercase (function) http://cppreference.com 2022.07.31 std::towlower(3)
NAME | Synopsis | Parameters | Return value | Notes | Example | Output: | See also
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