< cpp‎ | locale
Localizations library
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Text encoding identifications
Defined in header <locale>
template< class CharT >
class messages_byname : public std::messages<CharT>;

std::messages_byname is a std::messages facet which encapsulates retrieval of strings from message catalogs of the locale specified at its construction.


[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

constructs a new messages_byname facet
(public member function) [edit]
destroys a messages_byname facet
(protected member function) [edit]


explicit messages_byname( const char* name, std::size_t refs = 0 );
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.


name - the name of the locale
refs - the number of references that link to the facet



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>) [edit]
invokes do_get
(public member function of std::messages<CharT>) [edit]
invokes do_close
(public member function of std::messages<CharT>) [edit]

Protected member functions

opens a named message catalog
(virtual protected member function of std::messages<CharT>) [edit]
retrieves a message from an open message catalog
(virtual protected member function of std::messages<CharT>) [edit]
closes a message catalog
(virtual protected member function of std::messages<CharT>) [edit]

[edit] Example

#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 ="sed", std::cout.getloc());
    if (cat < 0)
        std::cout << "Could not open \"sed\" message catalog\n";
        std::cout << "\"No match\" "
                  << facet.get(cat, 0, 0, "No match") << '\n'
                  << "\"Memory exhausted\" " 
                  << facet.get(cat, 0, 0, "Memory exhausted") << '\n';
int main()
    std::locale loc("en_US.utf8");
    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) [edit]