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Apache C++ Standard Library Reference Guide


Library:  Localization


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Locale convenience function that determines if a character is alphabetic or numeric


#include <locale>

namespace std {
  template <class charT> 
  bool isalnum(charT c, const locale& loc);


The isalnum() function returns true if the character passed as a parameter is either part of the alphabet specified by the locale parameter or a decimal digit. Otherwise the function returns false. The check is made using the ctype facet from the locale parameter.


See Also

ctype, locale, isalpha(), iscntrl(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(), isupper(), isxdigit()

Standards Conformance

ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section

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