function template
<locale>
std::isxdigit
template <class charT> bool isxdigit (charT c, const locale& loc);
Check if character is hexadecimal digit using locale
Checks whether c is a hexadecimal digit character using the ctype facet of locale loc, returning the same as if ctype::is is called as:
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use_facet < ctype<charT> > (loc).is (ctype_base::xdigit, c)
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This function template overloads the C function isxdigit (defined in <cctype>).
Parameters
- c
- Character to be checked.
- loc
- Locale to be used. It shall have a ctype facet.
The template argument charT is the character type.
Return Value
true if indeed c is a hexadecimal digit character.
false otherwise.
Example
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// isxdigit example (C++)
#include <iostream> // std::cout, std::hex, std::dec
#include <string> // std::string
#include <sstream> // std::stringstream
#include <locale> // std::locale, std::isxdigit
int main ()
{
std::locale loc;
std::string str="ffff";
if ( std::isxdigit(str[0],loc) )
{
int number;
std::stringstream(str) >> std::hex >> number;
std::cout << "The hexadecimal number " << std::hex << number;
std::cout << " is " << std::dec << number << ".\n";
}
return 0;
}
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Output:
The hexadecimal number ffff is 65535.
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Data races
Both loc and its ctype facet are accessed.
Exception safety
Strong guarantee: if an exception is thrown, there are no effects.
See also
- ctype
- Character type facet (class template)
- isxdigit (cctype)
- Check if character is hexadecimal digit (function)
- isdigit
- Check if character is a decimal digit using locale (function template)
- isalnum
- Check if character is alphanumeric using locale (function template)
- isalpha
- Check if character is alphabetic using locale (function template)