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std::num_get

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Lokalisierungen Bibliothek
Locales und Facetten
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Locales and facets
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locale
Buchstaben-Klassifikation
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Character classification
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Conversions
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Conversions
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Facet Kategorie Basisklassen
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Facet category base classes
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Facet Kategorien
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Facet categories
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Locale-spezifische Facetten
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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
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C locale
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std::num_get
Member-Funktionen
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Member functions
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num_get::num_get
num_get::~num_get
num_get::get
num_get::do_get
 
Defined in header <locale>
template<

    class CharT,
    class InputIt = std::istreambuf_iterator<CharT>

> class num_get;
Klasse std::num_get kapselt die Regeln für das Parsen von String-Darstellungen der Werte des Typs bool, unsigned short, unsigned int, long, unsigned long, long long, unsigned long long, float, double, long double und void*. Die Standard-Formatierung Eingabe-Operatoren (wie cin >> n;) die std::num_get Facette des I / O-Streams locale, um den Text Darstellungen der Zahlen zu analysieren .
Original:
Class std::num_get encapsulates the rules for parsing string representations of values of type bool, unsigned short, unsigned int, long, unsigned long, long long, unsigned long long, float, double, long double, and void*. The standard formatting input operators (such as cin >> n;) use the std::num_get facet of the I/O stream's locale to parse the text representations of the numbers.
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cpp/locale/locale/facetstd-num get-inheritance.svg
Über dieses Bild

Inheritance diagram

Inhaltsverzeichnis

[Bearbeiten] Type Anforderungen

-
InputIt must meet the requirements of InputIterator.

[Bearbeiten] Spezialisierungen

Zwei Spezialisierungen und zwei partielle Spezialisierungen werden durch die Standard-Bibliothek zur Verfügung gestellt und werden von allen locale Objekte in einem C + +-Programm erstellt implementiert:
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Two specializations and two partial specializations are provided by the standard library and are implemented by all locale objects created in a C++ program:
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Defined in header <locale>
std::num_get<char>
erzeugt eine enge String-Parsing von Zahlen
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creates narrow string parsing of numbers
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std::num_get<wchar_t>
schafft breite Zeichenfolgenanalyse von Zahlen
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creates wide string parsing of numbers
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std::num_get<char, InputIt>
erzeugt eine enge String-Parsing von Zahlen mithilfe von benutzerdefinierten Eingabe-Iterator
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creates narrow string parsing of numbers using custom input iterator
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std::num_get<wchar_t, InputIt>
schafft breite Zeichenfolgenanalyse von Zahlen mithilfe von benutzerdefinierten Eingabe-Iterator
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creates wide string parsing of numbers using custom input iterator
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[Bearbeiten] Mitglied Typen

Mitglied Typ
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Member type
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Definition
char_type CharT
iter_type InputIt

[Bearbeiten] Member-Funktionen

baut eine neue num_get Facette
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constructs a new num_get facet
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(öffentliche Elementfunktion)
zerstört sich eine num_get Facette
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destructs a num_get facet
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(geschützt Member-Funktion)
Beruft do_get
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invokes do_get
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(öffentliche Elementfunktion)

[Bearbeiten] Mitglied widerspricht

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

[Bearbeiten] Geschützt Member-Funktionen

[virtuell]
parst eine Nummer aus einem Eingabestrom
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parses a number from an input stream
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(virtuellen geschützten Member-Funktion)

[Bearbeiten] Beispiel

#include <iostream>
#include <locale>
#include <string>
#include <sstream>
#include <iterator>
int main()
{
    std::string de_double = "1.234.567,89";
    std::string us_double = "1,234,567.89";
 
    // parse using streams
    std::istringstream de_in(de_double);
    de_in.imbue(std::locale("de_DE"));
    double f1;
    de_in >> f1;
 
    std::istringstream us_in(de_double);
    us_in.imbue(std::locale("en_US.UTF-8"));
    double f2;
    us_in >> f2;
 
    std::cout << "Parsing " << de_double << " as double gives " << std::fixed
              << f1 << " in de_DE locale and " << f2 << " in en_US\n";
 
    // use the facet directly
    std::istringstream s3(us_double);
    s3.imbue(std::locale("en_US.UTF-8"));
    auto& f = std::use_facet<std::num_get<char>>(s3.getloc());
    std::istreambuf_iterator<char> beg(s3), end;
    double f3;
    std::ios::iostate err;
    f.get(beg, end, s3, err, f3);
    std::cout << "parsing " << us_double
              << " as double using raw en_US facet gives " << f3 << '\n';
}

Output:

Parsing 1.234.567,89 as double gives 1234567.890000 in de_DE locale and 1.234000 in en_US
parsing 1,234,567.89 as double using raw en_US facet gives 1234567.890000

[Bearbeiten] Siehe auch

definiert numerische Satzzeichen Regeln
Original:
defines numeric punctuation rules
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(Klassen-Template) [edit]
Formate numerische Werte für die Ausgabe als Zeichenfolge
Original:
formats numeric values for output as character sequence
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(Klassen-Template) [edit]
Extrakte formatierte Daten
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extracts formatted data
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(öffentliche Elementfunktion of std::basic_istream) [edit]