std::numpunct_byname

 

C++

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Localizations library

Locales and facets
locale
use_facet	has_facet
Character classification
isspace isblank (C++11) iscntrl isupper islower isalpha	isdigit ispunct isxdigit isalnum isprint isgraph
Conversions
toupper tolower	wstring_convert (C++11) wbuffer_convert (C++11)
Facet category base classes
ctype_base codecvt_base messages_base	time_base money_base
Facet categories
ctype ctype<char> codecvt collate messages time_get time_put	num_get num_put numpunct money_get money_put moneypunct
Locale-specific facets
ctype_byname ctype_byname<char> codecvt_byname messages_byname collate_byname	time_get_byname time_put_byname numpunct_byname moneypunct_byname
Code conversion facets
codecvt_utf8 (C++11) codecvt_utf16 (C++11)	codecvt_utf8_utf16 (C++11) codecvt_mode (C++11)
C locale
setlocale localeconv lconv	LC_ALL LC_COLLATE LC_CTYPE LC_MONETARY LC_NUMERIC LC_TIME

 

Defined in header <locale>
template< class charT > class numpunct_byname : public std::numpunct<charT>;

std::numpunct_byname is a std::numpunct facet which encapsulates numeric punctuation preferences of a locale specified at its construction.

Two specializations are provided by the standard library

Defined in header <locale>
std::numpunct_byname<char>	locale-specific std::numpunct facet for narrow character I/O
std::numpunct_byname<wchar_t>	locale-specific std::numpunct facet for wide characters I/O

Member types

Member type	Definition
char_type	charT
string_type	std::basic_string<charT>

Member functions

(constructor)	constructs a new numpunct_byname facet (public member function)
(destructor)	destructs a numpunct_byname facet (protected member function)

Example

This example demonistrates how to apply numeric punctuation rules of another language without changing the rest of the locale.

#include <iostream>
#include <locale>
int main()
{
    const double number = 1000.25;
    std::wcout << L"default locale: " << number << L'\n';
    std::wcout.imbue(std::locale(std::wcout.getloc(),
                                 new std::numpunct_byname<wchar_t>("ru_RU.UTF8")));
    std::wcout << L"default locale with russian numpunct: " << number << L'\n';
}

Output:

default locale: 1000.25
default locale with russian numpunct: 1 000,25

See also

numpunct	defines numeric punctuation rules (class template)