cpp/string/byte/isspace

Checks if the given character is whitespace character as classified by the currently installed C locale. In the default locale, the whitespace characters are the following:


 * space
 * form feed
 * line feed
 * carriage return
 * horizontal tab
 * vertical tab

The behavior is undefined if the value of is not representable as  and is not equal to.

Return value
Non-zero value if the character is a whitespace character, zero otherwise.