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std::num_get

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< cpp‎ | locale

 
 
Bibliothèque localisations
Locales et facettes
Original:
Locales and facets
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locale
Classification des caractères
Original:
Character classification
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Conversions
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Conversions
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Classes de facettes catégorie de base
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Facet category base classes
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Catégories de facettes
Original:
Facet categories
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Spécifique aux paramètres régionaux facettes
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Locale-specific facets
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Facettes de conversion de code
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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::num_get
Les fonctions membres
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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;
Classe std::num_get encapsule les règles de l'analyse des représentations de chaîne de valeurs de type bool, unsigned short, unsigned int, long, unsigned long, long long, unsigned long long, float, double, long double et void*. Les opérateurs classiques de mise en forme d'entrée (comme cin >> n;) utiliser la facette std::num_get de la localisation du flux d'E / S pour analyser les représentations textuelles des nombres .
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
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Inheritance diagram

Sommaire

[modifier] Exigences de type

-
InputIt must meet the requirements of InputIterator.

[modifier] Spécialisations

Deux spécialisations et deux spécialisations partielles sont fournies par la bibliothèque standard et sont mises en œuvre par tous les objets créés dans un environnement linguistique programme C + +:
Original:
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>
crée l'analyse de chaîne étroite de chiffres
Original:
creates narrow string parsing of numbers
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std::num_get<wchar_t>
crée l'analyse des chaînes gamme de numéros
Original:
creates wide string parsing of numbers
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std::num_get<char, InputIt>
crée l'analyse de chaîne étroite de nombres à l'aide itérateur d'entrée personnalisé
Original:
creates narrow string parsing of numbers using custom input iterator
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std::num_get<wchar_t, InputIt>
crée l'analyse des chaînes gamme de numéros à l'aide itérateur d'entrée personnalisé
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creates wide string parsing of numbers using custom input iterator
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[modifier] Types de membres

Type du membre Définition
char_type CharT
iter_type InputIt

[modifier] Fonctions membres

construit un nouveau num_get facette
Original:
constructs a new num_get facet
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(fonction membre publique)
Détruit une facette num_get
Original:
destructs a num_get facet
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(fonction membre protégée)
Invoque do_get
Original:
invokes do_get
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(fonction membre publique)

[modifier] Objets membres

static std::locale::id id
Id de la localisation
Original:
id of the locale
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(objet membre public)

[modifier] Protégé fonctions membres

[
virtuel
Original:
virtual
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]
analyse un certain nombre à partir d'un flux d'entrée
Original:
parses a number from an input stream
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(fonction membre virtuelle protégée)

[modifier] Exemple

#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';
}

Résultat :

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

[modifier] Voir aussi

définit les règles de ponctuation numériques
Original:
defines numeric punctuation rules
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(classe générique) [edit]
Les valeurs numériques des formats de sortie comme séquence de caractères
Original:
formats numeric values for output as character sequence
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(classe générique) [edit]
extraits des données formatées
Original:
extracts formatted data
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(fonction membre publique de std::basic_istream) [edit]