Hi guys,

I'm currently trying to implement an async server in C++ 14, loosely 
following the example provided in 
https://github.com/grpc/grpc/blob/v1.14.1/examples/cpp/helloworld/greeter_async_server.cc

In my class equivalent to ServerImpl in the example, I have the member: '
std::unique_ptr<grpc::Server> server;', just as the ServerImpl has the 
member 'std::unique_ptr<Server> server_;'

However when I compile I receive the following error, triggered by the 
presence of the server member variable: 

[build] /usr/include/c++/7/bits/unique_ptr.h: In instantiation of ‘void 
std::default_delete<_Tp>::operator()(_Tp*) const [with _Tp = grpc::Server]’:
[build] /usr/include/c++/7/bits/unique_ptr.h:268:17: required from 
‘std::unique_ptr<_Tp, _Dp>::~unique_ptr() [with _Tp = grpc::Server; _Dp = 
std::default_delete<grpc::Server>]’
[build] 
/home/developer/open-iot-server/deployment-management-controller/grpc_server.hpp:50:9:
 
required from here
[build] /usr/include/c++/7/bits/unique_ptr.h:76:22: error: invalid 
application of ‘sizeof’ to incomplete type ‘grpc::Server’
[build] static_assert(sizeof(_Tp)>0,
[build] ^

I'm relatively new to modern C++ as I've come from an embedded background 
where C++ 03 is still common-place, so my apologies in advance if this is 
more a misunderstanding of the correct usage of uniqe_ptr.

Any support/advice would be much appreciated.

Many thanks,
Alistair

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