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std::ctype_byname<char>

Defined in header <locale> 
template<>
class ctype_byname : public std::ctype<char>;

This specialization of std::ctype_byname encapsulates character classification features for type char. Like its base class std::ctype<char> and unlike general-purpose std::ctype_byname, table lookup is used to classify characters

Member types

Member type Definition
mask ctype<char>::mask

Member functions

(constructor)
constructs a new ctype_byname<char> facet
(public member function)
(destructor)
destructs a ctype_byname<char> facet
(protected member function)

Inherited from std::ctype<char>

Member types

Member type Definition
char_type char

Member objects

Member name Type
id (static) std::locale::id
table_size (static const) std::size_t 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

Member types

Type Definition
mask unspecified bitmask 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)

Example

#include <iostream>
#include <locale>
 
int main()
{
    char c = '\xde'; // 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<char>("en_US.utf8"));
 
    std::cout << "isupper('Þ', C locale with Unicode ctype<char>) returned "
              << std::boolalpha << std::isupper(c, loc) << '\n';
 
    loc = std::locale(loc, new std::ctype_byname<char>("is_IS.iso88591"));
 
    std::cout << "isupper('Þ', C locale with Islandic ctype<char>) returned "
              << std::boolalpha << std::isupper(c, loc) << '\n';
}

Output:

isupper('Þ', C locale) returned false
isupper('Þ', C locale with Unicode ctype<char>) returned false
isupper('Þ', C locale with Islandic ctype<char>) returned true

See also

defines character classification tables
(class template)
specialization of std::ctype for type char
(class template specialization)

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