std::shared_ptr::unique() is deprecated in C++17

[dirk-zimoch]

serverContext.cpp uses std::shared_ptr::unique() here

pvAccessCPP/src/server/serverContext.cpp

Line 301 in 1492b3d

#define LEAK_CHECK(PTR, NAME) if((PTR) && !(PTR).unique()) { std::cerr<<"Leaking ServerContext " NAME " use_count="<<(PTR).use_count()<<"\n"<<show_referrers(PTR, false);}

and here

pvAccessCPP/src/server/serverContext.cpp

Line 571 in 1492b3d

if(!wrapped.unique())

but that method is deprecated in c++17 and removed in C++20.

MSVC 2019 warns about this when using -Zc:__cplusplus -std:c++17:

src\server\serverContext.cpp(321): warning C4996: 'std::shared_ptr<epics::pvAccess::BlockingUDPTransport>::unique':
warning STL4016: std::shared_ptr::unique() is deprecated in C++17.
You can define _SILENCE_CXX17_SHARED_PTR_UNIQUE_DEPRECATION_WARNING or _SILENCE_ALL_CXX17_DEPRECATION_WARNINGS
to acknowledge that you have received this warning.

It can be silenced but that may only lead to problems later.

I have not seen a similar warning or error from gcc or clang, even when using -std:c++23.

[mdavidsaver]

It can be silenced but that may only lead to problems later.

I think the necessary substitution will be with .use_count()==1.

[dirk-zimoch]

I think the necessary substitution will be with .use_count()==1.

So it seems. And in your context it even might work, because the multi threading concurrency problem seems not to apply.