std:: ctype_byname
|
Defined in header
<locale>
|
||
|
template
<
class
CharT
>
class ctype_byname : public std:: ctype < CharT > ; |
||
std::ctype_byname
is a
std::ctype
facet which encapsulates character classification rules of the locale specified at its construction.
Specializations
The standard library is guaranteed to provide the following specializations:
|
Defined in header
<locale>
|
|
| std :: ctype_byname < char > | provides narrow character classification (uses table lookup for character classification) |
| std :: ctype_byname < wchar_t > | provides wide character classification |
Nested types
| Type | Definition |
mask
|
typename std:: ctype < CharT > :: mask |
Member functions
|
(constructor)
|
constructs a new
ctype_byname
facet
(public member function) |
|
(destructor)
|
destroys a
ctype_byname
facet
(protected member function) |
std::ctype_byname:: ctype_byname
|
explicit
ctype_byname
(
const
char
*
name,
std::
size_t
refs
=
0
)
;
|
||
|
explicit
ctype_byname
(
const
std::
string
&
name,
std::
size_t
refs
=
0
)
;
|
(since C++11) | |
Constructs a new
std::ctype_byname
facet for a locale with
name
.
refs is used for resource management: if refs == 0 , the implementation destroys the facet, when the last std::locale object holding it is destroyed. Otherwise, the object is not destroyed.
Parameters
| name | - | the name of the locale |
| refs | - | the number of references that link to the facet |
std::ctype_byname:: ~ctype_byname
|
protected
:
~ctype_byname ( ) ; |
||
Destroys the facet.
Inherited from
std::
ctype
<CharT>
(only if
CharT
is not
char
)
Nested types
| Type | Definition |
char_type
|
CharT
|
Data members
| Member | Description |
std::locale::id
id
[static]
|
the identifier of the facet |
Member functions
invokes
do_is
(public member function of
std::ctype<CharT>
)
|
|
invokes
do_scan_is
(public member function of
std::ctype<CharT>
)
|
|
invokes
do_scan_not
(public member function of
std::ctype<CharT>
)
|
|
invokes
do_toupper
(public member function of
std::ctype<CharT>
)
|
|
invokes
do_tolower
(public member function of
std::ctype<CharT>
)
|
|
invokes
do_widen
(public member function of
std::ctype<CharT>
)
|
|
invokes
do_narrow
(public member function of
std::ctype<CharT>
)
|
Protected member functions
|
[virtual]
|
converts a character or characters to uppercase
(virtual protected member function of
std::ctype<CharT>
)
|
|
[virtual]
|
converts a character or characters to lowercase
(virtual protected member function of
std::ctype<CharT>
)
|
|
[virtual]
|
converts a character or characters from
char
to
CharT
(virtual protected member function of
std::ctype<CharT>
)
|
|
[virtual]
|
converts a character or characters from
CharT
to
char
(virtual protected member function of
std::ctype<CharT>
)
|
|
[virtual]
|
classifies a character or a character sequence
(virtual protected member function of
std::ctype<CharT>
)
|
|
[virtual]
|
locates the first character in a sequence that conforms to given classification
(virtual protected member function of
std::ctype<CharT>
)
|
|
[virtual]
|
locates the first character in a sequence that fails given classification
(virtual protected member function of
std::ctype<CharT>
)
|
Inherited from
std::
ctype<char>
(only if
CharT
is
char
)
Nested types
| Type | Definition |
char_type
|
char |
Data members
| Member | Description |
std::locale::id
id
[static]
|
the identifier of the facet |
const
std::
size_t
table_size
[static]
|
size of the classification table, at least 256 |
Member functions
|
obtains the character classification table
(public member function of
std::ctype
<char>
)
|
|
|
[static]
|
obtains the "C" locale character classification table
(public static member function of
std::ctype
<char>
)
|
|
classifies a character or a character sequence, using the classification table
(public member function of
std::ctype
<char>
)
|
|
|
locates the first character in a sequence that conforms to given classification, using the classification table
(public member function of
std::ctype
<char>
)
|
|
|
locates the first character in a sequence that fails given classification, using the classification table
(public member function of
std::ctype
<char>
)
|
|
invokes
do_toupper
(public member function of
std::ctype<CharT>
)
|
|
invokes
do_tolower
(public member function of
std::ctype<CharT>
)
|
|
invokes
do_widen
(public member function of
std::ctype<CharT>
)
|
|
invokes
do_narrow
(public member function of
std::ctype<CharT>
)
|
Protected member functions
|
[virtual]
|
converts a character or characters to uppercase
(virtual protected member function of
std::ctype<CharT>
)
|
|
[virtual]
|
converts a character or characters to lowercase
(virtual protected member function of
std::ctype<CharT>
)
|
|
[virtual]
|
converts a character or characters from
char
to
CharT
(virtual protected member function of
std::ctype<CharT>
)
|
|
[virtual]
|
converts a character or characters from
CharT
to
char
(virtual protected member function of
std::ctype<CharT>
)
|
Inherited from std:: ctype_base
Nested types
| Type | Definition |
mask
|
unspecified BitmaskType type (enumeration, integer type, or bitset) |
Member constants
|
space
[static]
|
the value of
mask
identifying whitespace character classification
(public static member constant) |
|
print
[static]
|
the value of
mask
identifying printable character classification
(public static member constant) |
|
cntrl
[static]
|
the value of
mask
identifying control character classification
(public static member constant) |
|
upper
[static]
|
the value of
mask
identifying uppercase character classification
(public static member constant) |
|
lower
[static]
|
the value of
mask
identifying lowercase character classification
(public static member constant) |
|
alpha
[static]
|
the value of
mask
identifying alphabetic character classification
(public static member constant) |
|
digit
[static]
|
the value of
mask
identifying digit character classification
(public static member constant) |
|
punct
[static]
|
the value of
mask
identifying punctuation character classification
(public static member constant) |
|
xdigit
[static]
|
the value of
mask
identifying hexadecimal digit character classification
(public static member constant) |
|
blank
[static]
(C++11)
|
the value of
mask
identifying blank character classification
(public static member constant) |
|
alnum
[static]
|
alpha
|
digit
(public static member constant) |
|
graph
[static]
|
alnum
|
punct
(public static member constant) |
Notes
std :: ctype_byname < char > was incorrectly declared as an explicit specialization in the synopsis of <locale> , and the declaration was removed by the resolution of LWG issue 1298 , but it remains a required specialization, just like std :: ctype_byname < wchar_t > .
Example
#include <iostream> #include <locale> int main() { wchar_t c = L'\u00de'; // capital letter thorn std::locale loc("C"); std::cout << "isupper('Þ', C locale) returned " << std::boolalpha << std::isupper(c, loc) << '\n'; loc = std::locale(loc, new std::ctype_byname<wchar_t>("en_US.utf8")); std::cout << "isupper('Þ', C locale with Unicode ctype) returned " << std::boolalpha << std::isupper(c, loc) << '\n'; }
Output:
isupper('Þ', C locale) returned false
isupper('Þ', C locale with Unicode ctype) returned true
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 16 | C++98 |
the definition of the explicit specialization
std
::
ctype_byname
<
char
>
misspecified the name and parameter list of
do_narrow
|
corrected |
| LWG 616 | C++98 |
the
typename
disambiguator was missing in the definition of
mask
|
added |
See also
|
defines character classification tables
(class template) |
|
|
specialization of
std::ctype
for type
char
(class template specialization) |