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std::num_put

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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
Original:
Conversions
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Classes de facettes catégorie de base
Original:
Facet category base classes
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Catégories de facettes
Original:
Facet categories
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Spécifique aux paramètres régionaux facettes
Original:
Locale-specific facets
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Facettes de conversion de code
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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std::num_put
Les fonctions membres
Original:
Member functions
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num_put::num_put
num_put::~num_put
num_put::put
num_put::do_put
 
Defined in header <locale>
template<

    class CharT,
    class OutputIt = std::ostreambuf_iterator<CharT>

> class num_put;
Classe std::num_put encapsule les règles pour les valeurs de mise en forme de type bool, long, unsigned long, long long, unsigned long long, double, long double, void*, et de tous les types implicitement convertibles en ceux-ci (tels que int ou float), sous forme de chaînes. Les opérateurs standard de sortie de mise en forme (comme cout << n;) utiliser la facette std::num_put de la localisation du flux d'E / S à générer représentation textuelle d'un nombre .
Original:
Class std::num_put encapsulates the rules for formatting values of type bool, long, unsigned long, long long, unsigned long long, double, long double, void*, and of all types implicitly convertible to these (such as int or float), as strings. The standard formatting output operators (such as cout << n;) use the std::num_put facet of the I/O stream's locale to generate text representation of numbers.
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cpp/locale/locale/facetstd-num put-inheritance.svg
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Inheritance diagram

Sommaire

[modifier] Exigences de type

-
OutputIt must meet the requirements of OutputIterator.

[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_put<char>
crée une chaine de caractères étroits de nombres
Original:
creates narrow string representations of numbers
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std::num_put<wchar_t>
crée une chaine de caractères larges de nombres
Original:
creates wide string representations of numbers
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std::num_put<char, OutputIt>
crée une chaine de caractères étroits de nombres à l'aide itérateur de sortie personnalisé
Original:
creates narrow string representations of numbers using custom output iterator
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std::num_put<wchar_t, OutputIt>
crée une chaine de caractères larges chiffres à l'aide itérateur de sortie personnalisé
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creates wide string representations of numbers using custom output iterator
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[modifier] Types de membres

Type du membre Définition
char_type CharT
iter_type OutputIt

[modifier] Fonctions membres

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

[modifier] Protégé fonctions membres

[
virtuel
Original:
virtual
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]
Formate un nombre et écrit dans le flux de sortie
Original:
formats a number and writes to output stream
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(fonction membre virtuelle protégée)

[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] Exemple

#include <iostream>
#include <locale>
#include <string>
#include <iterator>
 
int main()
{
    double n = 1234567.89;
    std::cout.imbue(std::locale("de_DE"));
    std::cout << "Direct conversion to string:\n"
              << std::to_string(n) << '\n'
              << "Output using a german locale:\n"
              << std::fixed << n << '\n'
              << "Output using an american locale:\n";
    // use the facet directly
    std::cout.imbue(std::locale("en_US.UTF-8"));
    auto& f = std::use_facet<std::num_put<char>>(std::cout.getloc());
    f.put(std::ostreambuf_iterator<char>(std::cout), std::cout, ' ', n);
    std::cout << '\n';
}

Résultat :

Direct conversion to string:
1234567.890000
Output using a german locale:
1.234.567,890000
Output using an american locale:
1,234,567.890000

[modifier] Voir aussi

définit les règles de ponctuation numériques
Original:
defines numeric punctuation rules
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(classe générique) [edit]
analyse des valeurs numériques à partir d'une séquence de caractères d'entrée
Original:
parses numeric values from an input character sequence
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(classe générique) [edit]
(C++11)
convertit une valeur de point intégrée ou flottante string
Original:
converts an integral or floating point value to string
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(fonction) [edit]
(C++11)
convertit une valeur de point intégrée ou flottante wstring
Original:
converts an integral or floating point value to wstring
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(fonction) [edit]