function template
<locale>
std::iscntrl
template <class charT> bool iscntrl (charT c, const locale& loc);
Check if character is a control character using locale
Checks whether c is a control 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::cntrl, c)
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This function template overloads the C function iscntrl (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 control character.
false otherwise.
Example
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// iscntrl example (C++)
#include <iostream> // std::cout
#include <string> // std::string
#include <locale> // std::locale, std::iscntrl
int main ()
{
std::locale loc;
std::string str="first line \n second line \n";
for (std::string::size_type i=0; i<str.length(); ++i)
{
if (std::iscntrl(str[i])) break;
std::cout << str[i];
}
return 0;
}
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Output:
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)
- iscntrl (cctype)
- Check if character is a control character (function)
- isgraph
- Check if character has graphical representation using locale (function template)
- ispunct
- Check if character is a punctuation character using locale (function template)