std::ctype <char> :: is
|
Defined in header
<locale>
|
||
|
bool
is
(
mask m,
char
c
)
const
;
|
(1) | |
|
const
char
*
is
(
const
char
*
low,
const
char
*
high, mask
*
vec
)
const
;
|
(2) | |
[
low
,
high
)
, reads its full classification mask from the classification table returned by the member function
table()
(that is, evaluates
table
(
)
[
(
unsigned
char
)
*
p
]
and stores it in the corresponding element of the array pointed to by
vec
.
If ( unsigned char ) c >= std:: ctype < char > :: table_size , then an implementation-defined value is substituted instead of table ( ) [ ( unsigned char ) c ] , possibly different for different values of c .
Parameters
| c | - | character to classify |
| m | - | mask to use for classifying a single character |
| low | - | pointer to the first character in an array of characters to classify |
| high | - | one past the end pointer for the array of characters to classify |
| vec | - | pointer to the first element of the array of masks to fill |
Return value
Notes
Unlike the primary template std:: ctype , this specialization does not perform a virtual function call when classifying characters. To customize the behavior, a derived class may provide a non-default classification table to the base class constructor.
Example
|
This section is incomplete
Reason: no example |
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 28 | C++98 |
overload (2) copied the values from
vec
into
table
(
)
,
which is the reverse of the intended behavior |
corrected |
See also
|
[virtual]
|
classifies a character or a character sequence
(virtual protected member function of
std::ctype<CharT>
)
|