22 Localization library [localization]

22.3 Locales [locales]

22.3.1 Class locale [locale] 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.

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

Returns: The result of the expression: !(*this == other).

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: The result of the following expression:

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 ]