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cppdraft/locale/messages/virtuals.md

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+[locale.messages.virtuals]
+
+# 28 Text processing library [[text]](./#text)
+
+## 28.3 Localization library [[localization]](localization#locale.messages.virtuals)
+
+### 28.3.4 Standard locale categories [[locale.categories]](locale.categories#locale.messages.virtuals)
+
+#### 28.3.4.8 The message retrieval category [[category.messages]](category.messages#locale.messages.virtuals)
+
+#### 28.3.4.8.2 Class template messages [[locale.messages]](locale.messages#virtuals)
+
+#### 28.3.4.8.2.3 Virtual functions [locale.messages.virtuals]
+
+[🔗](#lib:messages,do_open)
+
+`catalog do_open(const string& name, const locale& loc) const;
+`
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L4819)
+
+*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[.](#1.sentence-1)
+
+The result can be used until it is passed to close()[.](#1.sentence-2)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L4828)
+
+Returns a value less than 0 if no such catalog can be opened[.](#2.sentence-1)
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L4831)
+
+*Remarks*: The locale argument loc is used for
+character set code conversion when retrieving messages, if needed[.](#3.sentence-1)
+
+[🔗](#lib:messages,do_get)
+
+`string_type do_get(catalog cat, int set, int msgid, const string_type& dfault) const;
+`
+
+[4](#4)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L4843)
+
+*Preconditions*: cat is a catalog obtained from open() and not yet closed[.](#4.sentence-1)
+
+[5](#5)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L4847)
+
+*Returns*: A message identified by
+arguments set, msgid, and dfault,
+according to
+an implementation-defined mapping[.](#5.sentence-1)
+
+If no such message can be found, returns dfault[.](#5.sentence-2)
+
+[🔗](#lib:message,do_close)
+
+`void do_close(catalog cat) const;
+`
+
+[6](#6)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L4862)
+
+*Preconditions*: cat is a catalog obtained from open() and not yet closed[.](#6.sentence-1)
+
+[7](#7)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L4866)
+
+*Effects*: Releases unspecified resources associated with cat[.](#7.sentence-1)
+
+[8](#8)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L4870)
+
+*Remarks*: The limit on such resources, if any, isimplementation-defined[.](#8.sentence-1)