std::locale
Defined in header <locale> | ? | ? |
|---|---|---|
class locale; | ? | ? |
类对象std::locale是一组不可变的不可变方面的不可变索引集。C++输入/输出库的每个流对象都与std::locale对象，并使用它的方面对所有数据进行解析和格式化。此外，区域设置对象与每个std::basic_regex对象。locale对象也可以用作谓词，与标准容器和算法执行字符串排序，并可以直接访问以获得或修改它们所持有的方面。
在C++程序中构造的每个区域设置至少包含以下标准方面，但是程序可以定义额外的专门化或全新的方面，并将它们添加到任何现有的locale对象中。
支撑面
*。
STD：校对<char>STD：：整理<wchar[医]T>
STD：：Ctype<char>STD：：Ctype<wchar[医]T>
STD：：codecvt<char，char，mbstate[医]t>std：：codecvt<char16[医]T，char，mbstate[医]t>std：：codecvt<char32[医]T，char，mbstate[医]t>std：：codecvt<wchar[医]T，char，mbstate[医]T>
STD：货币量<char>STD：：货币化<char，真>std：：货币化<wchar[医]T>STD：：Moneyypunct<wchar[医]T，真>
STD：钱[医]弄到<char>STD：钱[医]得到<wchar[医]T>
STD：钱[医]放<char>STD：钱[医]放置<wchar[医]T>
性传播疾病：无刺<char>STD：：num点t<wchar[医]T>
STD：：NUM[医]弄到<char>STD：：NUM[医]得到<wchar[医]T>
STD：：NUM[医]放<char>STD：：NUM[医]放置<wchar[医]T>
STD：时间[医]弄到<char>STD：时间[医]得到<wchar[医]T>
STD：时间[医]放<char>STD：时间[医]放置<wchar[医]T>
STD：信息<char>STD：：消息<wchar[医]T>
在内部，区域设置对象被实现为-如果它是指向数组%28索引的引用计数指针。std::locale::id指向方面的引用计数指针%29：复制区域设置只复制一个指针，并增加多个引用计数。为了维护标准的C++库线程安全保证，不同对象上的%28操作总是线程安全的%29，区域设置引用计数和每个方面引用计数都以线程安全的方式更新，类似于std::shared_ptr...
成员类型
id | the facet index type: each facet class must declare or inherit a public static member of this type (class) |
|---|---|
facet | the base class for all facet categories: each facet of any category is derived from this type (class) |
category | int (typedef) |
成员对象
none static | a zero value of type category indicating no facet category (public static member constant) |
|---|---|
collate static | a bitmask value of type category indicating the collate facet category (public static member constant) |
ctype static | a bitmask value of type category indicating the ctype facet category (public static member constant) |
monetary static | a bitmask value of type category indicating the monetary facet category (public static member constant) |
numeric static | a bitmask value of type category indicating the numeric facet category (public static member constant) |
time static | a bitmask value of type category indicating the time facet category (public static member constant) |
messages static | a bitmask value of type category indicating the messages facet category (public static member constant) |
all static | collate | ctype | monetary | numeric | time | messages (public static member constant) |
成员函数
(constructor) | constructs a new locale (public member function) |
|---|---|
(destructor) | destructs the locale and the facets whose reference count becomes zero (public member function) |
operator= | replaces a locale (public member function) |
combine | constructs a locale with compile-time identified facet copied from another locale (public member function) |
name | returns the name of the locale or "*" if unnamed (public member function) |
operator==operator!= | equality comparison between locale objects (public member function) |
operator() | lexicographically compares two strings using this locale's collate facet (public member function) |
global static | changes the global locale (public static member function) |
classic static | obtains a reference to the "C" locale (public static member function) |
例
演示区域设置敏感程序%28跨平台%29的典型序言。
二次
#include <iostream>
#include <locale>
int main()
{
std::wcout << "User-preferred locale setting is " << std::locale("").name().c_str() << '\n';
// on startup, the global locale is the "C" locale
std::wcout << 1000.01 << '\n';
// replace the C++ global locale as well as the C locale with the user-preferred locale
std::locale::global(std::locale(""));
// use the new global locale for future wide character output
std::wcout.imbue(std::locale());
// output the same number again
std::wcout << 1000.01 << '\n';
}二次
可能的产出：
二次
User-preferred locale setting is en_US.UTF8
1000.01
1,000.01二次
另见
use_facet | obtains a facet from a locale (function template) |
|---|---|
has_facet | checks if a locale implements a specific facet (function template) |
imbue | sets locale (public member function of std::ios_base) |
getloc | returns current locale (public member function of std::ios_base) |
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