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Showing content from https://timsong-cpp.github.io/cppwp/n4659/locale.messages.virtuals below:

[locale.messages.virtuals]

25 Localization library [localization] 25.4 Standard locale categories [locale.categories] 25.4.7 The message retrieval category [category.messages] 25.4.7.1 Class template messages [locale.messages] 25.4.7.1.2 messages virtual functions [locale.messages.virtuals]

catalog do_open(const basic_string<char>& name, const locale& loc) const;

Returns: A value that may be passed to get() to retrieve a message from the message catalog identified by the string name according to an implementation-defined mapping. The result can be used until it is passed to close().

Returns a value less than 0 if no such catalog can be opened.

Remarks: The locale argument loc is used for character set code conversion when retrieving messages, if needed.

string_type do_get(catalog cat, int set, int msgid, const string_type& dfault) const;

Requires: cat shall be a catalog obtained from open() and not yet closed.

Returns: A message identified by arguments set, msgid, and dfault, according to an implementation-defined mapping. If no such message can be found, returns dfault.

void do_close(catalog cat) const;

Requires: cat shall be a catalog obtained from open() and not yet closed.

Effects: Releases unspecified resources associated with cat.

Remarks: The limit on such resources, if any, is implementation-defined.


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