Difference between revisions of "cpp/locale/messages byname"
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| − | {{ | + | {{tt|std::messages_byname}} is a {{lc|std::messages}} facet which encapsulates retrieval of strings from message catalogs of the locale specified at its construction. |
| − | + | ===Specializations=== | |
| + | The standard library is guaranteed to provide the following specializations: | ||
{{dsc begin}} | {{dsc begin}} | ||
{{dsc header | locale }} | {{dsc header | locale }} | ||
Latest revision as of 22:27, 13 February 2023
| Defined in header <locale>
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| template< class CharT > class messages_byname : public std::messages<CharT>; |
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std::messages_byname is a std::messages facet which encapsulates retrieval of strings from message catalogs of the locale specified at its construction.
Contents |
[edit] Specializations
The standard library is guaranteed to provide the following specializations:
| Defined in header
<locale> | |
| std::messages_byname<char> | narrow/multibyte message catalog access |
| std::messages_byname<wchar_t> | wide string message catalog access |
[edit] Member types
| Member type | Definition |
catalog
|
std::messages_base<CharT>::catalog |
string_type
|
std::basic_string<CharT> |
[edit] Member functions
| (constructor) |
constructs a new messages_byname facet (public member function) |
| (destructor) |
destroys a messages_byname facet (protected member function) |
std::messages_byname::messages_byname
| explicit messages_byname( const char* name, std::size_t refs = 0 ); |
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| explicit messages_byname( const std::string& name, std::size_t refs = 0 ); |
(since C++11) | |
Constructs a new std::messages_byname facet for a locale with name.
refs is used for resource management: if refs == 0, the implementation destroys the facet, when the last std::locale object holding it is destroyed. Otherwise, the object is not destroyed.
Parameters
| name | - | the name of the locale |
| refs | - | the number of references that link to the facet |
std::messages_byname::~messages_byname
| protected: ~messages_byname(); |
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Destroys the facet.
Inherited from std::messages
Member types
| Member type | Definition |
char_type
|
CharT
|
string_type
|
std::basic_string<CharT> |
Member objects
| Member name | Type |
id (static)
|
std::locale::id |
Member functions
invokes do_open (public member function of std::messages<CharT>)
| |
invokes do_get (public member function of std::messages<CharT>)
| |
invokes do_close (public member function of std::messages<CharT>)
|
Protected member functions
| [virtual] |
opens a named message catalog (virtual protected member function of std::messages<CharT>)
|
| [virtual] |
retrieves a message from an open message catalog (virtual protected member function of std::messages<CharT>)
|
| [virtual] |
closes a message catalog (virtual protected member function of std::messages<CharT>)
|
[edit] Example
Run this code
#include <iostream> #include <locale> void try_with(const std::locale& loc) { const std::messages<char>& facet = std::use_facet<std::messages<char>>(loc); std::messages<char>::catalog cat = facet.open("sed", std::cout.getloc()); if (cat < 0) std::cout << "Could not open \"sed\" message catalog\n"; else std::cout << "\"No match\" " << facet.get(cat, 0, 0, "No match") << '\n' << "\"Memory exhausted\" " << facet.get(cat, 0, 0, "Memory exhausted") << '\n'; facet.close(cat); } int main() { std::locale loc("en_US.utf8"); std::cout.imbue(loc); try_with(std::locale(loc, new std::messages_byname<char>("de_DE.utf8"))); try_with(std::locale(loc, new std::messages_byname<char>("fr_FR.utf8"))); try_with(std::locale(loc, new std::messages_byname<char>("ja_JP.utf8"))); }
Possible output:
"No match" Keine Übereinstimmung "Memory exhausted" Speicher erschöpft "No match" Pas de concordance "Memory exhausted" Mémoire épuisée "No match" 照合しません "Memory exhausted" メモリーが足りません
[edit] See also
| implements retrieval of strings from message catalogs (class template) |
