| Localization library | |||||||||||||||||||||||||
| Regular expressions library(C++11) | |||||||||||||||||||||||||
| Formatting library(C++20) | |||||||||||||||||||||||||
| Null-terminated sequence utilities | |||||||||||||||||||||||||
| Byte strings | |||||||||||||||||||||||||
| Multibyte strings | |||||||||||||||||||||||||
| Wide strings | |||||||||||||||||||||||||
| Primitive numeric conversions | |||||||||||||||||||||||||
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| Text encoding identifications | |||||||||||||||||||||||||
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Defined in header <locale> | ||
template<class CharT> bool isalnum( CharT ch,const locale& loc); | ||
Checks if the given character is classified as an alphanumeric character by the given locale'sstd::ctype facet.
Contents |
| ch | - | character |
| loc | - | locale |
Returnstrue if the character is classified as alphanumeric,false otherwise.
template<class CharT>bool isalnum(CharT ch,conststd::locale& loc){returnstd::use_facet<std::ctype<CharT>>(loc).is(std::ctype_base::alnum, ch);} |
Demonstrates the use ofisalnum() with different locales (OS-specific).
#include <iostream>#include <locale> int main(){constwchar_t c= L'\u2135';// mathematical symbol aleph std::locale loc1("C");std::cout<<"isalnum('ℵ', C locale) returned "<<std::boolalpha<<std::isalnum(c, loc1)<<'\n'; std::locale loc2("en_US.UTF-8");std::cout<<"isalnum('ℵ', Unicode locale) returned "<<std::boolalpha<<std::isalnum(c, loc2)<<'\n';}
Possible output:
isalnum('ℵ', C locale) returned falseisalnum('ℵ', Unicode locale) returned true| checks if a character is alphanumeric (function)[edit] | |
| checks if a wide character is alphanumeric (function)[edit] |
