30 Localization library [localization]

30.4 Standard locale categories [locale.categories]

30.4.8 The message retrieval category [category.messages]

30.4.8.2 Class template messages [locale.messages]

30.4.8.2.3 Virtual functions [locale.messages.virtuals]

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catalog do_open(const string& name, const locale& loc) const;
1
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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().
2
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Returns a value less than 0 if no such catalog can be opened.
3
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Remarks: The locale argument loc is used for character set code conversion when retrieving messages, if needed.
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string_type do_get(catalog cat, int set, int msgid, const string_type& dfault) const;
4
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Preconditions: cat is a catalog obtained from open() and not yet closed.
5
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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.
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void do_close(catalog cat) const;
6
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Preconditions: cat is a catalog obtained from open() and not yet closed.
7
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Effects: Releases unspecified resources associated with cat.
8
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Remarks: The limit on such resources, if any, is implementation-defined.