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std::ctype

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Lokalisierungen Bibliothek
Locales und Facetten
Original:
Locales and facets
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locale
Buchstaben-Klassifikation
Original:
Character classification
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Conversions
Original:
Conversions
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Facet Kategorie Basisklassen
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Facet category base classes
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Facet Kategorien
Original:
Facet categories
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Locale-spezifische Facetten
Original:
Locale-specific facets
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Code-Konvertierung Facetten
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Code conversion facets
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codecvt_utf8(C++11)
codecvt_utf16(C++11)
C locale
Original:
C locale
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std::ctype
Member-Funktionen
Original:
Member functions
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ctype::ctype
ctype::~ctype
ctype::is
ctype::do_is
ctype::scan_id
ctype::do_scan_id
ctype::scan_not
ctype::do_scan_not
ctype::toupper
ctype::do_toupper
ctype::tolower
ctype::do_tolower
ctype::widen
ctype::do_widen
ctype::narrow
ctype::do_narrow
 
Defined in header <locale>
template< class CharT >
class ctype;
Klasse ctype kapselt Charakter Klassifizierung Funktionen. Alle Stream Input Operationen durch std::basic_istream<charT> durchgeführt verwenden std::ctype<charT> des Gebietsschemas in dem Strom Leerzeichen zur Eingabe tokenization identifizieren durchdrungen. Stream Output-Operationen gelten std::ctype<charT>::widen() zu schmalen Zeichen Argumente vor der Ausgabe .
Original:
Class ctype encapsulates character classification features. All stream input operations performed through std::basic_istream<charT> use the std::ctype<charT> of the locale imbued in the stream to identify whitespace characters for input tokenization. Stream output operations apply std::ctype<charT>::widen() to narrow-character arguments prior to output.
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cpp/locale/ctype basecpp/locale/locale/facetstd-ctype-inheritance.svg
Über dieses Bild

Inheritance diagram

Zwei Spezialisierungen werden durch die Standard-Bibliothek zur Verfügung gestellt
Original:
Two specializations are provided by the standard library
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Defined in header <locale>
std::ctype<char>
bietet Äquivalente des "C"-Locale Klassifizierung. Diese Spezialisierung verwendet Lookup-Tabelle für Zeichen Klassifizierung
Original:
provides equivalents of the "C" locale classification. This specialization uses table lookup for character classification
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std::ctype<wchar_t>
bietet Breitzeichen Äquivalente des "C"-Locale Klassifizierung
Original:
provides wide character equivalents of the "C" locale classification
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Inhaltsverzeichnis

[Bearbeiten] Mitglied Typen

Mitglied Typ
Original:
Member type
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Definition
char_type CharT

[Bearbeiten] Member-Funktionen

baut eine neue ctype Facette
Original:
constructs a new ctype facet
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(öffentliche Elementfunktion)
zerstört sich eine ctype Facette
Original:
destructs a ctype facet
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(geschützt Member-Funktion)
Beruft do_is
Original:
invokes do_is
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(öffentliche Elementfunktion) [edit]
Beruft do_scan_is
Original:
invokes do_scan_is
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(öffentliche Elementfunktion) [edit]
Beruft do_scan_not
Original:
invokes do_scan_not
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(öffentliche Elementfunktion) [edit]
Beruft do_toupper
Original:
invokes do_toupper
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(öffentliche Elementfunktion) [edit]
Beruft do_tolower
Original:
invokes do_tolower
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(öffentliche Elementfunktion) [edit]
Beruft do_widen
Original:
invokes do_widen
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(öffentliche Elementfunktion) [edit]
Beruft do_narrow
Original:
invokes do_narrow
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(öffentliche Elementfunktion) [edit]

[Bearbeiten] Geschützt Member-Funktionen

[virtuell]
stuft ein Zeichen oder eine Zeichenfolge
Original:
classifies a character or a character sequence
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(virtuellen geschützten Member-Funktion) [edit]
[virtuell]
ortet das erste Zeichen in einer Sequenz, die zu bestimmten Klassifizierung entspricht
Original:
locates the first character in a sequence that conforms to given classification
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(virtuellen geschützten Member-Funktion) [edit]
[virtuell]
findet das erste Zeichen in einer Sequenz, die givne Klassifizierung ausfällt
Original:
locates the first character in a sequence that fails givne classification
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(virtuellen geschützten Member-Funktion) [edit]
[virtuell]
wandelt ein oder mehrere Zeichen in Großbuchstaben
Original:
converts a character or characters to uppercase
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(virtuellen geschützten Member-Funktion) [edit]
[virtuell]
wandelt ein oder mehrere Zeichen in Kleinbuchstaben
Original:
converts a character or characters to lowercase
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(virtuellen geschützten Member-Funktion) [edit]
[virtuell]
wandelt ein Zeichen oder Zeichen aus char um charT
Original:
converts a character or characters from char to charT
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(virtuellen geschützten Member-Funktion) [edit]
[virtuell]
wandelt ein Zeichen oder Zeichen aus charT um char
Original:
converts a character or characters from charT to char
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(virtuellen geschützten Member-Funktion) [edit]

[Bearbeiten] Mitglied widerspricht

static std::locale::id id
ID des Gebietsschemas
Original:
id of the locale
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(öffentliche Member-Objekt)

Inherited from std::ctype_base

Member types

Type
Original:
Type
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Definition
mask
unbestimmte Bitmaske Typ (Aufzählung, Integer-Typ oder bitset)
Original:
unspecified bitmask type (enumeration, integer type, or bitset)
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Member constants

space
[statisch]
der Wert mask Identifizieren Leerzeichen Klassifizierung
Original:
the value of mask identifying whitespace character classification
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(public static Mitglied konstanten)
print
[statisch]
der Wert mask identifizieren druckbare Zeichen Klassifizierung
Original:
the value of mask identifying printable character classification
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(public static Mitglied konstanten)
cntrl
[statisch]
der Wert mask identifizieren Steuerzeichen Klassifizierung
Original:
the value of mask identifying control character classification
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(public static Mitglied konstanten)
upper
[statisch]
der Wert mask identifizieren Großbuchstaben Klassifizierung
Original:
the value of mask identifying uppercase character classification
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(public static Mitglied konstanten)
lower
[statisch]
der Wert mask identifizieren Kleinbuchstaben Klassifizierung
Original:
the value of mask identifying lowercase character classification
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(public static Mitglied konstanten)
alpha
[statisch]
der Wert mask identifizieren Buchstaben Klassifizierung
Original:
the value of mask identifying alphabetic character classification
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(public static Mitglied konstanten)
digit
[statisch]
der Wert mask identifizieren Ziffernzeichen Klassifizierung
Original:
the value of mask identifying digit character classification
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(public static Mitglied konstanten)
punct
[statisch]
der Wert mask identifizieren Satzzeichen Klassifizierung
Original:
the value of mask identifying punctuation character classification
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(public static Mitglied konstanten)
xdigit
[statisch]
der Wert mask identifizieren Hexadezimalziffer Charakter Klassifizierung
Original:
the value of mask identifying hexadecimal digit character classification
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(public static Mitglied konstanten)
blank
[statisch] (C++11)
der Wert mask identifizieren Leerzeichen Klassifizierung
Original:
the value of mask identifying blank character classification
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(public static Mitglied konstanten)
alnum
[statisch]
alpha | digit
(public static Mitglied konstanten)
graph
[statisch]
alnum | punct
(public static Mitglied konstanten)

[Bearbeiten] Beispiel

Das folgende Beispiel demonstriert Modifikation eines ctype andere als ctype <char> zu einer CSV-Datei tokenize
Original:
The following example demonstrates modification of a ctype other than ctype<char> to tokenize of a CSV file
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#include <iostream>
#include <locale>
#include <sstream>
 
struct csv_whitespace : std::ctype<wchar_t> {
    bool do_is(mask m, char_type c) const
    {   
        if ((m & space) && c == L' ') {
            return false; // space will NOT be classified as whitespace
        }
        if ((m & space) && c == L',') {
            return true; // comma will be classified as whitespace
        }
        return ctype::do_is(m, c); // leave the rest to the parent class
    } 
};
 
int main()
{
    std::wstring in = L"Column 1,Column 2,Column 3\n123,456,789";
    std::wstring token;
 
    std::wcout << "default locale:\n";
    std::wistringstream s1(in);
    while (s1 >> token) {
        std::wcout << "  " << token << '\n';
    }
 
    std::wcout << "locale with modified ctype:\n";
    std::wistringstream s2(in);
    s2.imbue(std::locale(s2.getloc(), new csv_whitespace()));
    while (s2 >> token) {
        std::wcout << "  " << token<< '\n';
    }
}

Output:

default locale:
  Column
  1,Column
  2,Column
  3
  123,456,789
locale with modified ctype:
  Column 1
  Column 2
  Column 3
  123
  456
  789

[Bearbeiten] Siehe auch

Spezialisierung std::ctype für Typ char
Original:
specialization of std::ctype for type char
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(class Template-Spezialisierung)
definiert Charakter Klassifizierungskategorien
Original:
defines character classification categories
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(Klassen-Template)
schafft eine ctype Facette für die benannte locale
Original:
creates a ctype facet for the named locale
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(Klassen-Template)