std::numpunct_byname

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

std::numpunct_byname::numpunct_byname

explicit numpunct_byname( const char* name, std::size_t refs = 0 );
explicit numpunct_byname( const std::string& name, std::size_t refs = 0 );		(since C++11)

Constructs a new std::numpunct_byname facet for a locale with name.

refs is used for resource management: if refs == 0, the implementation destroys the facet, when the last std::locale object holding it is destroyed. Otherwise, the object is not destroyed.

Parameters

name	-	the name of the locale
refs	-	the number of references that link to the facet

std::numpunct_byname::~numpunct_byname

protected: ~numpunct_byname();

Destroys the facet.

Inherited from std::numpunct

Member types

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

Member functions

decimal_point	invokes `do_decimal_point` (public member function of `std::numpunct`)
thousands_sep	invokes `do_thousands_sep` (public member function of `std::numpunct`)
grouping	invokes `do_grouping` (public member function of `std::numpunct`)
truenamefalsename	invokes `do_truename` or `do_falsename` (public member function of `std::numpunct`)

Protected member functions

do_decimal_point [virtual]	provides the character to use as decimal point (virtual protected member function of `std::numpunct`)
do_thousands_sep [virtual]	provides the character to use as thousands separator (virtual protected member function of `std::numpunct`)
do_grouping [virtual]	provides the numbers of digits between each pair of thousands separators (virtual protected member function of `std::numpunct`)
do_truenamedo_falsename [virtual]	provides the string to use as the name of the boolean true and false (virtual protected member function of `std::numpunct`)

Member objects

static std::locale::id id

id of the locale
(public member object)

[edit] Example

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

Run this code

#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

[edit] See also

numpunct

defines numeric punctuation rules
(class template)

Language
Standard library headers
Concepts
Utilities library
Strings library
Containers library
Algorithms library
Iterators library
Numerics library
Input/output library
Localizations library
Regular expressions library (C++11)
Atomic operations library (C++11)
Thread support library (C++11)
Filesystem library (C++17)
Technical Specifications

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