std::numpunct_byname
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| Defined in header | | |
|---|---|---|
| template< class CharT > class numpunct_byname : public std::numpunct<CharT>; | | |
std::numpunct_byname是std::numpunctfacet，它封装在构造时指定的区域设置的数字标点符号首选项。
标准库提供了两个专门化。
在标头中定义<locale>
*。
性传播疾病：无刺[医]名名<char>特定于地区的STD：：窄字符I/O的
性传播疾病：无刺[医]名<wchar[医]特定于地区的STD：：宽字符I/O的
成员类型
| Member type | Definition |
|---|---|
| char_type | CharT |
| string_type | std::basic_string<CharT> |
成员函数
| (constructor) | constructs a new numpunct_byname facet (public member function) |
|---|---|
| (destructor) | destroys a numpunct_byname facet (protected member function) |
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| 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) |
构造一个新的std::numpunct_byname区域设置的方面name...
refs用于资源管理：如果refs == 0时，该实现破坏了面。std::locale保存它的对象被销毁。否则，该对象不会被销毁。
参数
| name | - | the name of the locale |
|---|---|---|
| refs | - | the number of references that link to the facet |
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| protected: ~numpunct_byname( | | |
|---|
摧毁了这个面。
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成员类型
| Member type | Definition |
|---|---|
| char_type | charT |
| string_type | std::basic_string<charT> |
成员函数
| 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) |
受保护成员函数
| 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) |
成员对象
| static std::locale::id id | id of the locale (public member object) |
|---|
例
此示例演示如何应用另一种语言的数字标点符号规则，而不更改其馀的区域设置。
二次
#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';
}
二次
产出：
二次
default locale: 1000.25
default locale with russian numpunct: 1 000,25
二次
另见
| numpunct | defines numeric punctuation rules (class template) |
|---|
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