[locale.global.templates]

# 28 Text processing library [[text]](./#text)

## 28.3 Localization library [[localization]](localization#locale.global.templates)

### 28.3.3 Locales [[locales]](locales#locale.global.templates)

#### 28.3.3.2 locale globals [locale.global.templates]

[🔗](#lib:locale,use_facet)

`template<class Facet> const Facet& use_facet(const locale& loc);
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L1177)

*Mandates*: Facet is a facet class
whose definition contains the public static member id as defined in [[locale.facet]](locale.facet "28.3.3.1.2.2 Class locale​::​facet")[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L1183)

*Returns*: A reference to the corresponding facet of loc, if present[.](#2.sentence-1)

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L1187)

*Throws*: bad_cast if has_facet<Facet>(loc) is false[.](#3.sentence-1)

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L1191)

*Remarks*: The reference returned remains valid
at least as long as any copy of loc exists[.](#4.sentence-1)

[🔗](#lib:locale,has_facet)

`template<class Facet> bool has_facet(const locale& loc) noexcept;
`

[5](#5)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L1203)

*Returns*: true if the facet requested is present in loc;
otherwise false[.](#5.sentence-1)