[Boost-users] [signals2] Warn unused result

Subject: [Boost-users] [signals2] Warn unused result
From: Deven (drt80d_at_[hidden])
Date: 2018-08-24 04:06:50

Hi,

I am using boost::signals2 library for event callback mechanism. The 
event register callback function returns a 
boost::signals2::scope_connection object for optional disconnect by the 
function registering itself.

I want to mandate using the returns result (scoped_connection) object by 
the user. So, I use the gcc attribute "__attribute__( ( 
warn_unused_result ) )" with the function.

The problem is that the compiler does not warn for unused result. Any 
ideas, why would this happen?

I am using Linux with g++ 4.8.4 and c++11 is enabled.

Boost version: 1.67.0

I have attached a minimal working example.

Thanks,

-Deven