std::numpunct_byname (3) - Linux Manuals

std::numpunct_byname: std::numpunct_byname

NAME

std::numpunct_byname - std::numpunct_byname

Synopsis

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

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

 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

              invokes do_decimal_point
decimal_point (public member function of std::numpunct<CharT>)
              invokes do_thousands_sep
thousands_sep (public member function of std::numpunct<CharT>)
              invokes do_grouping
grouping (public member function of std::numpunct<CharT>)
              invokes do_truename or do_falsename
truename (public member function of std::numpunct<CharT>)
falsename

Protected member functions

do_decimal_point provides the character to use as decimal point
                 (virtual protected member function of std::numpunct<CharT>)
[virtual]

do_thousands_sep provides the character to use as thousands separator
                 (virtual protected member function of std::numpunct<CharT>)
[virtual]

do_grouping provides the numbers of digits between each pair of thousands separators
                 (virtual protected member function of std::numpunct<CharT>)
[virtual]

do_truename provides the string to use as the name of the boolean true and false
do_falsename (virtual protected member function of std::numpunct<CharT>)

[virtual]

Member objects

                          id of the locale
static std::locale::id id (public member object)

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