std::num_get

 

C++

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Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Localizzazioni libreria

Impostazioni internazionali e sfaccettature Original: Locales and facets The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
locale
use_facet	has_facet
Carattere classificazione Original: Character classification The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
isspace isblank (C++11) iscntrl isupper islower isalpha	isdigit ispunct isxdigit isalnum isprint isgraph
Conversioni Original: Conversions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
toupper tolower	wstring_convert (C++11) wbuffer_convert (C++11)
Facet categoria classi di base Original: Facet category base classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ctype_base codecvt_base messages_base	time_base money_base
Facet categorie Original: Facet categories The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ctype ctype<char> codecvt collate messages time_get time_put	num_get num_put numpunct money_get money_put moneypunct
Locale specifici aspetti Original: Locale-specific facets The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ctype_byname ctype_byname<char> codecvt_byname messages_byname collate_byname	time_get_byname time_put_byname numpunct_byname moneypunct_byname
Codice di conversione sfaccettature Original: Code conversion facets The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
codecvt_utf8 (C++11) codecvt_utf16 (C++11)	codecvt_utf8_utf16 (C++11) codecvt_mode (C++11)
C locale Original: C locale The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
setlocale localeconv lconv	LC_ALL LC_COLLATE LC_CTYPE LC_MONETARY LC_NUMERIC LC_TIME

 

std::num_get

Membri funzioni Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

num_get::num_get

num_get::~num_get

num_get::get num_get::do_get

 

Elemento definito nell'header <locale>
template<     class CharT,     class InputIt =std::istreambuf_iterator<CharT> >class num_get;

Classe std::num_get incapsula le regole per l'analisi di rappresentazioni di stringa di valori di tipo bool, unsignedshort, unsignedint, long, unsignedlong, longlong, unsignedlonglong, float, double, longdouble e void*. Lo standard di formattazione operatori di input (ad esempio cin >> n;) utilizzare l'aspetto del locale std::num_get I / O ruscello per analizzare le rappresentazioni di testo dei numeri.

Original:

Class std::num_get encapsulates the rules for parsing string representations of values of type bool, unsignedshort, unsignedint, long, unsignedlong, longlong, unsignedlonglong, float, double, longdouble, 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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Inheritance diagram

Tipo requisiti

- InputIt must meet the requirements of InputIterator.

Specializzazioni

Due specializzazioni e due specializzazioni parziali sono fornite dalla libreria standard e sono attuate da tutti gli oggetti delle impostazioni locali creati in un programma 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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Definizione nell'header <locale>
std::num_get<char>	crea analisi stretta stringa di numeri Original: creates narrow string parsing of numbers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
std::num_get<wchar_t>	crea analisi gamma stringa di numeri Original: creates wide string parsing of numbers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
std::num_get<char, InputIt>	crea analisi stretta stringa di numeri che utilizzano iteratore di input personalizzato Original: creates narrow string parsing of numbers using custom input iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
std::num_get<wchar_t, InputIt>	crea analisi gamma stringa di numeri che utilizzano iteratore di input personalizzato Original: creates wide string parsing of numbers using custom input iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Membri tipi

Membro tipo Original: Member type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Definition
char_type	CharT
iter_type	InputIt

Membri funzioni

(costruttore)	costruisce un nuovo aspetto num_get Original: constructs a new num_get facet The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)
(destructor)	distrugge un aspetto num_get Original: destructs a num_get facet The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (protetto funzione membro)
get	Invoca do_get Original: invokes do_get The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)

Membri oggetti

static std::locale::id id	' Id del locale Original: id of the locale The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (attributo pubblico)

Protetto funzioni membro

do_get [virtuale]	analizza un numero da un flusso di input Original: parses a number from an input stream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (virtuale protetto funzione membro)

Esempio

#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 streamsstd::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 directlystd::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

Vedi anche

numpunct	definisce le regole di punteggiatura numerici Original: defines numeric punctuation rules The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe template)
num_put	valori formati numerici per l'uscita come sequenza di caratteri Original: formats numeric values for output as character sequence The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe template)
operator>>	estratti i dati formattati Original: extracts formatted data The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)