25 Localization library [localization]

25.3 Locales [locales]

25.3.1 Class locale [locale]

25.3.1.4 locale operators [locale.operators]

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

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.

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

Returns: !(*this == other).

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

Effects: Compares two strings according to the collate<charT> facet.

Remarks: This member operator template (and therefore locale itself) satisfies requirements for a comparator predicate template argument (Clause [algorithms]) applied to strings.

Returns:

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

[ Example

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

std::sort(v.begin(), v.end(), loc);

— end example

]