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> |
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|---|---|
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 type | Definition |
|---|---|
char_type | CharT |
string_type | std::basic_string<CharT> |
| (constructor) | constructs a new numpunct_byname facet (public member function) |
| (destructor) | destroys a numpunct_byname facet (protected member function) |
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.
| name | - | the name of the locale |
| refs | - | the number of references that link to the facet |
protected: ~numpunct_byname(); |
Destroys the facet.
| Member type | Definition |
|---|---|
char_type | charT |
string_type | std::basic_string<charT> |
invokes do_decimal_point (public member function of std::numpunct) |
|
invokes do_thousands_sep (public member function of std::numpunct) |
|
invokes do_grouping (public member function of std::numpunct) |
|
invokes do_truename or do_falsename (public member function of std::numpunct) |
|
[virtual] | provides the character to use as decimal point (virtual protected member function of std::numpunct) |
|
[virtual] | provides the character to use as thousands separator (virtual protected member function of std::numpunct) |
|
[virtual] | provides the numbers of digits between each pair of thousands separators (virtual protected member function of std::numpunct) |
|
[virtual] | provides the string to use as the name of the boolean true and false (virtual protected member function of std::numpunct) |
| static std::locale::id id | id of the locale (public member object) |
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
| defines numeric punctuation rules (class template) |
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