std::num_get
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| Заголовочный файл <locale>
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| template< class CharT, |
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Класс
std::num_get инкапсулирует правила для разбора строкового представления значения типа bool, unsigned short, unsigned int, long, unsigned long, long long, unsigned long long, float, double, long double, и void*. Стандартное форматирование входных операторов (таких как cin >> n;) используют std::num_get аспект языка ввода / вывода потока для разбора текста представления чисел.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.
Диаграмма наследования
Содержание |
[править] Тип требованиям
-InputIt должен соответствовать требованиям InputIterator.
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[править] Специализации
Две специализации и два частичных специализаций предусмотрены стандартные библиотеки и осуществляются все локали объекты, созданные в C + + программ
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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| Определено в файле <locale>
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| std::num_get<char> | создает узкую разбора строки цифр
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> | создает широкие разбора строки цифр
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> | создает узкую разбора строки цифр с использованием пользовательского итератора ввода
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> | создает широкие разбора строки цифр с использованием пользовательского итератора ввода
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. |
[править] Член типов
| Член типа
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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[править] Член функций
| строит новую грань 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. (public функция-член) | |
| разрушает num_get грань 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. (protected функция-член) | |
| Вызывает 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. (public функция-член) | |
[править] Член объектов
| static std::locale::id id |
' Идентификатор локали 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. (public объект-член) |
[править] Охраняемые функций-членов
| [virtual] |
анализирует ряд из входного потока 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. (virtual protected функция-член) |
[править] Пример
#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'; }
Вывод:
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
[править] См. также
| определяет числовой правил пунктуации 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. (шаблон класса) | |
| Форматы числовых значений для вывода как последовательности символов 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. (шаблон класса) | |
| Экстракты отформатированные данные 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. (public функция-член std::basic_istream)
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