std::num_get
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| Defined in header <locale>
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| template< class CharT, |
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Clase
std::num_get encapsula las reglas para analizar las representaciones de cadena de valores de tipo bool, unsigned short, unsigned int, long, unsigned long, long long, unsigned long long, float, double, long double y void*. Los operadores de formato estándar de entrada (como cin >> n;) utilizan la faceta std::num_get de la configuración regional del flujo de I / O para analizar las representaciones de texto de los números .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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Inheritance diagram
Contenido |
[editar] Tipo de requisitos
-InputIt must meet the requirements of InputIterator.
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[editar] Especializaciones
Dos especializaciones y dos especializaciones parciales son proporcionados por la biblioteca estándar y son aplicadas por todos los objetos creados en un entorno nacional C + + programa:
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:
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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| Defined in header
<locale> | |
| std::num_get<char> | crea el análisis de cadenas estrecho de números
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 el análisis de cadenas gama de números
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 el análisis de cadenas estrecho de números usando iterador de entrada personalizado
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 el análisis de cadenas gama de números usando iterador de entrada personalizado
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. |
[editar] Tipos de miembros
| Miembro de 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
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CharT
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iter_type
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InputIt
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[editar] Las funciones miembro
| construye una nueva faceta 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. (miembro público función) | |
| destructs una faceta 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. (protegidos función miembro) | |
| 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. (miembro público función) | |
[editar] Objetos miembros
| static std::locale::id id |
Identificador de la configuración regional 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. (objeto miembro del público) |
[editar] Protegido funciones miembro
| [virtual] |
analiza un número de un flujo de entrada 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. (virtuales protegidos miembro de función) |
[editar] Ejemplo
#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
[editar] Ver también
| define las reglas numéricas de puntuación 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. (clase de plantilla) | |
| formatos numéricos los valores de salida como una secuencia de caracteres 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. (clase de plantilla) | |
| extractos de formato de datos 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. (miembro público of std::basic_istream función)
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