28 Text processing library [text]

28.3 Localization library [localization]

28.3.3 Locales [locales]

28.3.3.1 Class locale [locale]

28.3.3.1.3 Constructors and destructor [locale.cons]

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locale() noexcept;
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Effects: Constructs a copy of the argument last passed to locale​::​global(locale&), if it has been called; else, the resulting facets have virtual function semantics identical to those of locale​::​classic().
[Note 1: 
This constructor yields a copy of the current global locale.
It is commonly used as a default argument for function parameters of type const locale&.
— end note]
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explicit locale(const char* std_name);
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Effects: Constructs a locale using standard C locale names, e.g., "POSIX".
The resulting locale implements semantics defined to be associated with that name.
3
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Throws: runtime_error if the argument is not valid, or is null.
4
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Remarks: The set of valid string argument values is "C", "", and any implementation-defined values.
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explicit locale(const string& std_name);
5
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Effects: Equivalent to locale(std_name.c_str()).
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locale(const locale& other, const char* std_name, category cats);
6
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Preconditions: cats is a valid category value ([locale.category]).
7
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Effects: Constructs a locale as a copy of other except for the facets identified by the category argument, which instead implement the same semantics as locale(std_name).
8
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Throws: runtime_error if the second argument is not valid, or is null.
9
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Remarks: The locale has a name if and only if other has a name.
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locale(const locale& other, const string& std_name, category cats);
10
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Effects: Equivalent to locale(other, std_name.c_str(), cats).
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template<class Facet> locale(const locale& other, Facet* f);
11
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Effects: Constructs a locale incorporating all facets from the first argument except that of type Facet, and installs the second argument as the remaining facet.
If f is null, the resulting object is a copy of other.
12
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Remarks: If f is null, the resulting locale has the same name as other.
Otherwise, the resulting locale has no name.
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locale(const locale& other, const locale& one, category cats);
13
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Preconditions: cats is a valid category value.
14
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Effects: Constructs a locale incorporating all facets from the first argument except those that implement cats, which are instead incorporated from the second argument.
15
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Remarks: If cats is equal to locale​::​none, the resulting locale has a name if and only if the first argument has a name.
Otherwise, the resulting locale has a name if and only if the first two arguments both have names.
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const locale& operator=(const locale& other) noexcept;
16
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Effects: Creates a copy of other, replacing the current value.
17
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Returns: *this.