std::locale::locale

(1) 預設建構函式

Constructs a copy of the current global locale.
The global locale is the locale set by a previous call to locale::global, or locale::classic if locale::global has not been called.

(2) copy constructor

Copies x.

(3) by-name construction

Uses the locale identified by the C-locale name specified by std_name.

(4) combining constructors

Constructs a locale with the same facets as x, except for those specified in cats, which are instead taken from y (or from std_name).
The constructed locale has no name when either x or y has no name.

(5) custom facet constructor

Constructs a copy of x and adds the facet pointed by f to it. If a facet with the same id static member exists in x, f replaces it.
The constructed locale has no name.
Note that this constructor is the only way to add custom facets to standard locale objects.

引數

x

Locale copied: the newly constructed object uses the same facets as specified by x (except those specified by cats or f).

std_name

A standard C-locale name.
These are specific of the library implementation, but at least the following two locales are guaranteed to exist on all implementations

區域設定名稱	描述
"C"	Minimal "C" locale (the same as locale::classic)
""	The environment's default locale

If this argument is a null pointer or does not represent a valid C-locale in the implementation, runtime_error is thrown.

cats

Set of categories that are used from the locale specified as second argument. The remaining categories are taken from the locale specified as first argument.
These shall be any bitwise combination of the values of member type locale::category.

f

Pointer to a facet object.
The resulting locale has this specific facet, with the rest of facet types being those specified by argument x.
The constructed locale object takes over responsibility for deleting this facet object.
If this is a null pointer, the constructed locale is a copy of x.
The constructor uses Facet::id to determine the facet type, replacing its equivalent in x (if it exists).

y

Locale object from which the facets specified in cats are used, with the remaining facets being taken from those in parameter x.

示例

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// locale::locale
#include <iostream>       // std::cout
#include <locale>         // std::locale
#include <stdexcept>      // std::runtime_error

int main ()
{
  std::locale loc;     // initialized to locale::classic()

  try {
    loc = std::locale ("en_US.UTF8");
  }
  catch (std::runtime_error) {
    loc = std::locale (loc, "", std::locale::ctype);
  }

  std::cout << "The selected locale is: " << loc.name() << '\n';

  return 0;
}

The selected locale is: en_US.UTF8

資料競爭

異常安全

另見

locale::global

Set global locale [static] (public static member function)

locale::classic

獲取經典區域設定 [static] (public static member function)