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std::ctype<div class="t-tr-text"><char><div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig"><char></div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div>

Da cppreference.com.
< cpp‎ | locale

 
 
Localizzazioni libreria
Impostazioni internazionali e sfaccettature
Original:
Locales and facets
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locale
Carattere classificazione
Original:
Character classification
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Conversioni
Original:
Conversions
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Facet categoria classi di base
Original:
Facet category base classes
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Facet categorie
Original:
Facet categories
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Locale specifici aspetti
Original:
Locale-specific facets
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Codice di conversione sfaccettature
Original:
Code conversion facets
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codecvt_utf8(C++11)
codecvt_utf16(C++11)
C locale
Original:
C locale
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Defined in header <locale>
template<>
class ctype<char>;
Questa specializzazione di std::ctype racchiude aspetti del carattere di classificazione per char tipo. A differenza di general-purpose std::ctype, tabella di ricerca viene utilizzato per classificare i caratteri. Il std::ctype<char> classe base implementa classificazione dei caratteri equivalente al locale "C". Le regole di classificazione può essere ampliato o modificato, se costruiti come std::ctype_byname<char> o come definito dall'utente aspetto derivato. Tutte le funzioni di ingresso in formato std::istream sono tenuti ad utilizzare per std::ctype<char> classing carattere durante l'analisi di input.
Original:
This specialization of std::ctype encapsulates character classification features for type char. Unlike general-purpose std::ctype, table lookup is used to classify characters. The base class std::ctype<char> implements character classification equivalent to the "C" locale. The classification rules can be extended or modified if constructed as std::ctype_byname<char> or as a user-defined derived facet. All std::istream formatted input functions are required to use std::ctype<char> for character classing during input parsing.
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cpp/locale/ctype basecpp/locale/locale/facetstd-ctype char-inheritance.svg
Informazioni sull'immagine

Inheritance diagram

Indice

[modifica] Membri tipi

Membro tipo
Original:
Member type
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Definition
char_type char

[modifica] Membri funzioni

costruisce un nuovo aspetto std::ctype<char>
Original:
constructs a new std::ctype<char> facet
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(membro pubblico funzione) [edit]
distrugge un aspetto std::ctype<char>
Original:
destructs a std::ctype<char> facet
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(protetto funzione membro) [edit]
ottiene la tabella di classificazione dei caratteri
Original:
obtains the character classification table
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(membro pubblico funzione) [edit]
ottiene la tabella dei caratteri "C" locale classificazione
Original:
obtains the "C" locale character classification table
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(public static membro funzione) [edit]
classifica un carattere o una sequenza di caratteri, utilizzando la tabella di classificazione
Original:
classifies a character or a character sequence, using the classification table
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(membro pubblico funzione) [edit]
individua il primo carattere in una sequenza che è conforme alla classificazione che, utilizzando la tabella di classificazione
Original:
locates the first character in a sequence that conforms to given classification, using the classification table
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(membro pubblico funzione) [edit]
locates the first character in a sequence that fails given classification, using the classification table
(membro pubblico funzione) [edit]
Invoca do_toupper
Original:
invokes do_toupper
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(membro pubblico of std::ctype funzione) [edit]
Invoca do_tolower
Original:
invokes do_tolower
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(membro pubblico of std::ctype funzione) [edit]
Invoca do_widen
Original:
invokes do_widen
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(membro pubblico of std::ctype funzione) [edit]
Invoca do_narrow
Original:
invokes do_narrow
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(membro pubblico of std::ctype funzione) [edit]

[modifica] Protetto funzioni membro

[virtuale]
converte uno o più caratteri in maiuscolo
Original:
converts a character or characters to uppercase
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(virtuale protetto funzione of std::ctype membro) [edit]
[virtuale]
converte uno o più caratteri in minuscolo
Original:
converts a character or characters to lowercase
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(virtuale protetto funzione of std::ctype membro) [edit]
[virtuale]
converte uno o più caratteri da char a charT
Original:
converts a character or characters from char to charT
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(virtuale protetto funzione of std::ctype membro) [edit]
[virtuale]
converte uno o più caratteri da charT a char
Original:
converts a character or characters from charT to char
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(virtuale protetto funzione of std::ctype membro) [edit]

[modifica] Membri oggetti

static std::locale::id id
[statico]
' Id del locale
Original:
id of the locale
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(pubblico membro statico costante)
static const std::size_t table_size
[statico]
dimensione della tabella di classificazione, a leaest 256
Original:
size of the classification table, at leaest 256
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(pubblico membro statico costante)

Inherited from std::ctype_base

Member types

Tipo
Original:
Type
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Definition
mask
maschera di bit di tipo non specificato (enumerazione, tipo intero, o bitset)
Original:
unspecified bitmask type (enumeration, integer type, or bitset)
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Member constants

space
[statico]
il valore di mask carattere classificazione Identificare gli spazi
Original:
the value of mask identifying whitespace character classification
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(pubblico membro statico costante)
print
[statico]
il valore di mask identificare classificazione stampabile carattere
Original:
the value of mask identifying printable character classification
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(pubblico membro statico costante)
cntrl
[statico]
il valore di classificazione di controllo mask identificazione carattere
Original:
the value of mask identifying control character classification
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(pubblico membro statico costante)
upper
[statico]
il valore di mask identificare classificazione carattere maiuscolo
Original:
the value of mask identifying uppercase character classification
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(pubblico membro statico costante)
lower
[statico]
il valore di mask identificare classificazione carattere minuscolo
Original:
the value of mask identifying lowercase character classification
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(pubblico membro statico costante)
alpha
[statico]
il valore di mask identificare classificazione carattere alfabetico
Original:
the value of mask identifying alphabetic character classification
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(pubblico membro statico costante)
digit
[statico]
il valore di mask identificare classificazione cifra
Original:
the value of mask identifying digit character classification
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(pubblico membro statico costante)
punct
[statico]
il valore di classificazione punteggiatura mask identificazione carattere
Original:
the value of mask identifying punctuation character classification
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(pubblico membro statico costante)
xdigit
[statico]
il valore di mask identificazione esadecimale classificazione cifra
Original:
the value of mask identifying hexadecimal digit character classification
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(pubblico membro statico costante)
blank
[statico] (C++11)
il valore di mask identificare classificazione bianco carattere
Original:
the value of mask identifying blank character classification
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(pubblico membro statico costante)
alnum
[statico]
alpha | digit
(pubblico membro statico costante)
graph
[statico]
alnum | punct
(pubblico membro statico costante)

[modifica] Esempio

L'esempio seguente mostra la modifica di <char> CType per tokenize di un file CSV
Original:
The following example demonstrates modification of ctype<char> to tokenize of a CSV file
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#include <iostream>
#include <vector>
#include <locale>
#include <sstream>
 
// This ctype facet classifies commas and endlines as whitespace
struct csv_whitespace : std::ctype<char> {
    static const mask* make_table()
    {
        // make a copy of the "C" locale table
        static std::vector<mask> v(classic_table(), classic_table() + table_size);
        v[','] |=  space;  // comma will be classified as whitespace
        v[' '] &= ~space;      // space will not be classified as whitespace
        return &v[0];
    }
    csv_whitespace(std::size_t refs = 0) : ctype(make_table(), false, refs) {}
};
 
int main()
{
    std::string in = "Column 1,Column 2,Column 3\n123,456,789";
    std::string token;
 
    std::cout << "default locale:\n";
    std::istringstream s1(in);
    while(s1 >> token)
            std::cout << "  " << token << '\n';
 
    std::cout << "locale with modified ctype:\n";
    std::istringstream s2(in);
    s2.imbue(std::locale(s2.getloc(), new csv_whitespace()));
    while(s2 >> token)
            std::cout << "  " << 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

[modifica] Vedi anche

definisce le tabelle di classificazione dei caratteri
Original:
defines character classification tables
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(classe template)
definisce le categorie di classificazione dei caratteri
Original:
defines character classification categories
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(classe template)
crea un aspetto ctype per le impostazioni internazionali di nome
Original:
creates a ctype facet for the named locale
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(classe template)