std::locale::locale
STD：：locale：：locale
| Defined in header | | |
|---|---|---|
| locale( | (1) | |
| locale( const locale& other | (2) | |
| explicit locale( const char* std_name | (3) | |
| explicit locale( const std::string& std_name | (4) | (since C++11) |
| locale( const locale& other, const char* std_name, category cat | (5) | |
| locale( const locale& other, const std::string& std_name, category cat | (6) | (since C++11) |
| template< class Facet > locale( const locale& other, Facet* f | (7) | |
| locale( const locale& other, const locale& one, category cat | (8) | |
构造一个新的区域设置对象。
1%29默认构造函数。构造全局C++区域设置的副本，这是最近用作std::locale::global或一份std::locale::classic如果没有呼叫std::locale::global已经制作好了。
2%29复制构造函数。构造other...
3-4%29构造系统区域设置的副本。std_name%28，如“C”、“POSIX”或“EN”[医]“us.utf-8”或“English”[医]如果操作系统支持此区域设置，则US.1251“%29”。以这种方式构造的区域设置有一个名称。
5-6%29构造other除cat参数，这些参数是从由其标识的系统区域设置复制的。std_name.以这种方式构造的区域设置有一个名称当且仅当other有个名字。
7%29构造other除了类型的面Facet%28通常是从参数%29的类型推断的，该参数是从参数安装的facet.如果facet是NULL，构造的区域设置是other.以这种方式构造的地区没有名称。
8%29构造other除cat参数，这些参数是从one.如果两者都是other和one有名称，则结果区域设置也有名称。
参数
| other | - | another locale to copy |
|---|---|---|
| std_name | - | name of the system locale to use |
| f | - | pointer to a facet to merge with other |
| cat | - | the locale category used to identify the facets to merge with other |
| one | - | another locale to take facets from |
例外
1，2%29
| (none) | (until C++11) |
|---|---|
| noexcept specification: noexcept | (since C++11) |
3.5%29std::runtime_error如果操作系统没有名为std_name或者如果std_name是NULL...
4，6%29std::runtime_error如果操作系统没有名为std_name...
7，8%29%28无29
注记
重载7通常用第二个参数调用，f，直接从新表达式获得：区域设置负责调用匹配。delete从它自己的破坏者那里。
例
二次
#include <iostream>
#include <locale>
#include <codecvt>
int main()
{
std::locale l1; // l1 is a copy of the classic "C" locale
std::locale l2("en_US.UTF-8" // l2 is a unicode locale
std::locale l3(l1, l2, std::locale::ctype // l3 is "C" except for ctype, which is unicode
std::locale l4(l1, new std::codecvt_utf8<wchar_t> // l4 is "C" except for codecvt
std::cout << "Locale names:\nl1: " << l1.name() << "\nl2: " << l2.name()
<< "\nl3: " << l3.name() << "\nl4: " << l4.name() << '\n';
}
二次
产出：
二次
Locale names:
l1: C
l2: en_US.UTF-8
l3: LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=C;LC_COLLATE=C;LC_MONETARY=C;LC_MESSAGES=C;LC_PAPER=C;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=C;LC_IDENTIFICATION=C
l4: *
二次
另见
| (destructor) | destructs the locale and the facets whose reference count becomes zero (public member function) |
|---|
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