std::use_facet

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C++
 
本地化库
语言环境方面
Original:
Locales and facets
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locale
use_facet
字符分类
Original:
Character classification
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转换
Original:
Conversions
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wstring_convert（C++11）
wbuffer_convert（C++11）
小面类的基类
Original:
Facet category base classes
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小面类
Original:
Facet categories
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特定于语言环境的方面
Original:
Locale-specific facets
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代码转换方面
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Code conversion facets
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codecvt_utf8（C++11）
codecvt_utf16（C++11）
codecvt_utf8_utf16（C++11）
codecvt_mode（C++11）
C语言环境
Original:
C locale
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Defined in header <locale>
template< class Facet >
const Facet& use_facet( const std::locale& loc );
获得一个参考的一个方面实施loc.
Original:
Obtains a reference to a facet implemented by loc.
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目录

[编辑] 参数

loc -
Locale对象来查询
Original:
the locale object to query
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[编辑] 返回值

返回一个参考的方面。参考这个函数返回的是有效的，只要存在任何std::locale对象，实现Facet.
Original:
Returns a reference the facet. The reference returned by this function is valid as long as any std::locale object exists that implements Facet.
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[编辑] 例外

std::bad_cast if std::has_facet<Facet>(loc) == false.

[编辑] 为例

显示3个字母的货币名称由用户的首选区域
Original:
Display the 3-letter currency name used by the user's preferred locale
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#include <iostream>
#include <locale>
 
int main()
{
    std::locale loc = std::locale(""); // user's preferred locale
    std::cout << "Your currency string is "
              << std::use_facet<std::moneypunct<char, true>>(loc).curr_symbol() << '\n';
}

Output: 

Your currency string is USD

[编辑] 另请参阅
多态的文化差异方面的封装
Original:
set of polymorphic facets that encapsulate cultural differences
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（类） [edit]
检查如果一个语言环境中实现一个特定的方面
Original:
checks if a locale implements a specific facet
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（函数模板） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/locale/use_facet&oldid=27769”