28 Localization library [localization]

28.3 Locales [locales]

28.3.1 Class locale [locale]

28.3.1.5 Static members [locale.statics]

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static locale global(const locale& loc);
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Effects: Sets the global locale to its argument.
Causes future calls to the constructor locale() to return a copy of the argument.
If the argument has a name, does 
setlocale(LC_ALL, loc.name().c_str());
otherwise, the effect on the C locale, if any, is implementation-defined.
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Remarks: No library function other than locale​::​global() affects the value returned by locale().
[ Note
:
See [c.locales] for data race considerations when setlocale is invoked.
— end note
 ]
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Returns: The previous value of locale().
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static const locale& classic();
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The "C" locale.
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Returns: A locale that implements the classic "C" locale semantics, equivalent to the value locale("C").
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Remarks: This locale, its facets, and their member functions, do not change with time.