[locale.operators]

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

## 28.3 Localization library [[localization]](localization#locale.operators)

### 28.3.3 Locales [[locales]](locales#locale.operators)

#### 28.3.3.1 Class locale [[locale]](locale#operators)

#### 28.3.3.1.5 Operators [locale.operators]

[🔗](#lib:locale,operator==)

`bool operator==(const locale& other) const;
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L1070)

*Returns*: true if
both arguments are the same locale, or
one is a copy of the other, or
each has a name and the names are identical;false otherwise[.](#1.sentence-1)

[🔗](#lib:locale,operator())

`template<class charT, class traits, class Allocator>
  bool operator()(const basic_string<charT, traits, Allocator>& s1,
                  const basic_string<charT, traits, Allocator>& s2) const;
`

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L1087)

*Effects*: Compares two strings according to the std​::​collate<charT> facet[.](#2.sentence-1)

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L1091)

*Returns*: use_facet<std::collate<charT>>(*this).compare(s1.data(), s1.data() + s1.size(),
 s2.data(), s2.data() + s2.size()) < 0

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L1098)

*Remarks*: This member operator template (and therefore locale itself)
meets the requirements for
a comparator predicate template argument ([[algorithms]](algorithms "26 Algorithms library")) applied to strings[.](#4.sentence-1)

[5](#5)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L1104)

[*Example [1](#example-1)*:

A vector of strings v can be collated according to collation rules in locale loc simply by ([[alg.sort]](alg.sort "26.8.2 Sorting"), [[vector]](vector "23.3.13 Class template vector")):

std::sort(v.begin(), v.end(), loc); — *end example*]