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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../locale/messages_byname.html below:

std::messages_byname - cppreference.com

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:

std::messages_byname<char> narrow/multibyte message catalog access std::messages_byname<wchar_t> wide string message catalog access [edit] Nested types [edit] Member functions constructs a new messages_byname facet
(public member function) [edit] destroys a messages_byname facet
(protected member function) [edit] std::messages_byname::messages_byname

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();

Destroys the facet.

Inherited from std::messages Nested types [edit] Data members 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] Inherited from std::messages_base Nested types Type Definition catalog an unspecified signed integer type [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 = 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) [edit]

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