std::messag...ges::do_get(3)

💅 std::messag...ges::do_get(3) 🎀

okay bestie so this little page lives in the C++ Standard Libary manual and it's all about std::messages::get and std::messages::do_get — the message-catalog girlies. i18n slay, no cap ✨

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🌸 NAME 🌸

std::messages::get, std::messages::do_get — literally the exact same two names, that's the whole NAME section, we move 💅

std::messages::get, std::messages::do_get

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✨ Synopsis ✨

Defined in header <locale>, bestie:

public:
string_type get( catalog cat, int set, int msgid, const string_type&
dfault )   (1)
const;
protected:
virtual string_type do_get( catalog cat, int set, int msgid, const
string_type& (2)
dfault ) const;

1. the public member function — it just calls the protected virtual member function do_get of the most derived class 🫶
2. the actual worker — it obtains a message from the open message catalog cat, using the values set, msgid and dfault in an implementation-defined manner. and if the expected message is not found in the catalog, it returns a copy of dfault. periodt 💖

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🦋 Parameters 🦋

• cat — identifier of message catalog obtained from open() and not yet passed to close() 👑 (do not be messy about this)
• set — implementation-defined argument, message set in POSIX
• msgid — implementation-defined argument, message id in POSIX
• dfault — the string to look up in the catalog (if the catalog uses string look-up) and also the string to return in case of a failure. she's doing double duty, main character energy fr fr 🌟

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🌈 Return value 🌈

The message from the catalog, or a copy of dfault if none was found. simple as that 🍓

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💜 Notes 💜

On POSIX systems, this function call usually translates to a call to catgets(), and the parameters set, msgid, and dfault are passed to catgets() as-is. iconic, no notes 😌

In GNU libstdc++, this function ignores set and msgid and simply calls GNU gettext(dfault) in the required locale. the way that it just does its own thing 😭💀

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🧚 Example 🧚

The following example demonstrated retrieval of messages: on a typical GNU/Linux system it reads from /usr/share/locale/de/LC_MESSAGES/sed.mo. lowkey obsessed with how specific that is 🎀

// Run this code

#include <iostream>
#include <locale>

int main()
{
    std::locale loc("de_DE.utf8");
    std::cout.imbue(loc);
    auto& facet = std::use_facet<std::messages<char>>(loc);
    auto cat = facet.open("sed", loc);
    if (cat < 0)
        std::cout << "Could not open german \"sed\" message catalog\n";
    else
        std::cout << "\"No match\" in German: "
                  << facet.get(cat, 0, 0, "No match") << '\n'
                  << "\"Memory exhausted\" in German: "
                  << facet.get(cat, 0, 0, "Memory exhausted") << '\n';
    facet.close(cat);
}

Possible output:

"No match" in German: Keine Übereinstimmung
"Memory exhausted" in German: Speicher erschöpft

she ate that 🍽️🔥

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⭐ See also ⭐

ngl this section as printed doesn't list any cross-reference entries — it's giving empty, but we're keeping the heading because we keep everything, iykyk 🙈💅

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and that's the whole page, bestie 🫶 — brought to you by http://cppreference.com, edition 2024.06.10, filed under std::messag...ges::do_get(3). go read a message catalog, ily 💖✨