Issue Report: False Positive: Using reference to dangling temporary.CppCheck(danglingTempReference)

[Lonchik]

Sample code snippet

// A type alias definition in some include.
using UniqueBuffer = std::tuple<std::unique_ptr<uint8_t[]>, size_t>;
// class member.
std::queue<UniqueBuffer> _queue;

// somewhere in a class member function...
        auto& headerbuf = _queue.emplace();
        std::get<0>(headerbuf) = std::unique_ptr<uint8_t[]>(new uint8_t[headersize]);
        std::get<1>(headerbuf) = headersize;

cppcheck highlights last two lines with error Using reference to dangling temporary.CppCheck(danglingTempReference).

Note that if I change the code line from auto& headerbuf = _queue.emplace(); to simply auto headerbuf = _queue.emplace(); (i.e. type instead of type reference), cppcheck stops flagging, but it's incorrect b/c now it is writing to a copy of memory, rather than into queue's entry's memory space.

Seems that cppcheck fails to recognize that std::tuple<...>& that's returned from std::queue::emplace() is not actually a temporary, but rather a reference to internal member space.

Env: using VSCode extension jbenden.c-cpp-flylint

$ brew info cppcheck 
cppcheck: stable 2.7 (bottled), HEAD
Static analysis of C and C++ code
https://sourceforge.net/projects/cppcheck/
/usr/local/Cellar/cppcheck/2.7 (83 files, 8.5MB) *
  Poured from bottle on 2022-02-14 at 14:54:48
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/cppcheck.rb
License: GPL-3.0-or-later
==> Dependencies
Build: cmake ✘, python@3.10 ✘
Required: pcre ✔, tinyxml2 ✔
==> Options
--HEAD
        Install HEAD version
==> Analytics
install: 2,553 (30 days), 6,817 (90 days), 25,803 (365 days)
install-on-request: 2,535 (30 days), 6,755 (90 days), 25,579 (365 days)
build-error: 2 (30 days)

[CHR]

Thanks, ticket is here: https://trac.cppcheck.net/ticket/10895

[Lonchik]

Awesome, thanks!