macro_rules! IS_DIGIT {
($string:expr) => { ... };
}
Expand description
Checks if the byte pointed to by the pointer
in the given string is a digit (0-9).
§Parameters
string
: A reference to a struct containing a pointer
field pointing to a byte in a string.
§Return value
Returns true
if the byte pointed to by the pointer
is a digit (0-9), and false
otherwise.