Wt

Hi Witty devs,

Using debian testing with latest packages; building with GCC 7.2 and Boost 1.66, I get the following errors:

[ 66%] Building CXX object src/CMakeFiles/wt.dir/Wt/Http/Response.C.o
In file included from /home/marco/Development/wt-4.0.2/src/Wt/Http/Client.C:10:0:
/home/marco/Development/wt-4.0.2/src/Wt/Http/Client.h:26:11: error: using typedef-name ‘boost::asio::io_service’ after ‘class’
     class io_service;
           ^~~~~~~~~~
In file included from /home/marco/local/include/boost/asio.hpp:69:0,
                 from /home/marco/Development/wt-4.0.2/src/Wt/AsioWrapper/asio.hpp:14,
                 from /home/marco/Development/wt-4.0.2/src/Wt/Http/Client.C:8:
/home/marco/local/include/boost/asio/io_service.hpp:27:20: note: ‘boost::asio::io_service’ has a previous declaration here
 typedef io_context io_service;
                    ^~~~~~~~~~
[ 66%] Building CXX object src/CMakeFiles/wt.dir/Wt/Http/ResponseContinuation.C.o
/home/marco/Development/wt-4.0.2/src/Wt/Http/Client.C:645:3: error: invalid use of template-name ‘boost::asio::strand’ without an argument list
   asio::strand strand_;
   ^~~~
/home/marco/Development/wt-4.0.2/src/Wt/Http/Client.C:645:3: note: class template argument deduction is only available with -std=c++1z or -std=gnu++1z
In file included from /home/marco/local/include/boost/asio.hpp:123:0,
                 from /home/marco/Development/wt-4.0.2/src/Wt/AsioWrapper/asio.hpp:14,
                 from /home/marco/Development/wt-4.0.2/src/Wt/Http/Client.C:8:
/home/marco/local/include/boost/asio/strand.hpp:29:7: note: ‘template<class Executor> class boost::asio::strand’ declared here
 class strand

I had a quick look at the files where the errors are coming from and it appears the root cause is that Boost Asio has defined these as typedefs, and Wt is forward declaring them.

Cheers