CODEWITHSUNDEEP
c++boostboost-asio
koch.trier
koch.trier

Reputation: 600

boost::asio::deadline_timer causes "a function call cannot appear in a constant-expression" error

I´m trying to use boost 1.54.0 on Windows and got some problems with asio::deadline_timer.

Here´s my (quite simple) code:

#include <boost/asio.hpp>
using boost::asio::deadline_timer;

int main() {  
    deadline_timer timeout;
}

When I try to compile this snippet using gcc 4.7 (cygwin) the following errors occur:

g++ -D__USE_W32_SOCKETS -D_WIN32_WINNT "-IC:\\dev\\lib\\boost_1_54_0" "-IC:\\dev\\workspace-cpp\\ts_core\\src" -O0 -g3 -Wall -c -fmessage-length=0 -o "src\\main.o" "..\\src\\main.cpp" 
In file included from C:\dev\lib\boost_1_54_0/boost/asio/detail/impl/posix_tss_ptr.ipp:24:0,
                 from C:\dev\lib\boost_1_54_0/boost/asio/detail/posix_tss_ptr.hpp:77,
                 from C:\dev\lib\boost_1_54_0/boost/asio/detail/tss_ptr.hpp:27,
                 from C:\dev\lib\boost_1_54_0/boost/asio/detail/call_stack.hpp:20,
                 from C:\dev\lib\boost_1_54_0/boost/asio/impl/handler_alloc_hook.ipp:19,
                 from C:\dev\lib\boost_1_54_0/boost/asio/handler_alloc_hook.hpp:80,
                 from C:\dev\lib\boost_1_54_0/boost/asio/detail/handler_alloc_helpers.hpp:21,
                 from C:\dev\lib\boost_1_54_0/boost/asio/detail/bind_handler.hpp:19,
                 from C:\dev\lib\boost_1_54_0/boost/asio/detail/wrapped_handler.hpp:18,
                 from C:\dev\lib\boost_1_54_0/boost/asio/io_service.hpp:25,
                 from C:\dev\lib\boost_1_54_0/boost/asio/basic_io_object.hpp:19,
                 from C:\dev\lib\boost_1_54_0/boost/asio/basic_socket.hpp:20,
                 from C:\dev\lib\boost_1_54_0/boost/asio/basic_datagram_socket.hpp:20,
                 from C:\dev\lib\boost_1_54_0/boost/asio.hpp:21,
                 from ..\src\main.cpp:8:
C:\dev\lib\boost_1_54_0/boost/asio/error.hpp:77:17: error: a function call cannot appear in a constant-expression
C:\dev\lib\boost_1_54_0/boost/asio/error.hpp:130:15: error: a function call cannot appear in a constant-expression
C:\dev\lib\boost_1_54_0/boost/asio/error.hpp:135:19: error: a function call cannot appear in a constant-expression
C:\dev\lib\boost_1_54_0/boost/asio/error.hpp:149:23: error: a function call cannot appear in a constant-expression
C:\dev\lib\boost_1_54_0/boost/asio/error.hpp:163:15: error: a function call cannot appear in a constant-expression
..\src\main.cpp: In function 'int main()':
..\src\main.cpp:24:17: error: no matching function for call to 'boost::asio::basic_deadline_timer<boost::posix_time::ptime>::basic_deadline_timer()'

I spent some time on research and added "-D__USE_W32_SOCKETS -D_WIN32_WINNT", but without success. The problem seems to be the line "#include " which is line 8 in main.cpp

Upvotes: 0

Views: 2074

Answers (4)

Kaz Dragon
Kaz Dragon

Reputation: 6809

This rings a bell for me; I think I had to work around the same problem once. I believe that some of the error codes that ASIO uses are not specified in certain versions of Windows. Try using the following:

-D_WIN32_WINNT=0x0501

This targets the build to a minimum of Windows XP (I believe).

Upvotes: 1

koch.trier
koch.trier

Reputation: 600

Finally, it seems to be a problem of cygwin-gcc and building DLLs.

After I got some more very strange errors using boost, cygwin/gcc and eclipse (e.g. dynamic_pointer_cast not terminating, causing endless loop) I switched to VisualStudio '12 and everything worked like a charm...

Upvotes: 0

Arne Mertz
Arne Mertz

Reputation: 24576

It appears there is something wrong with the build configuration. The lines you mention all are calls to a BOOST_ASIO_WIN_OR_POSIX macro which is the switch between calls to posix and native win implementation details. It seems your configuration somehow messes that up, includes the wrong headers and/or expands the macro wrong. The macro definition basically reads like this:

#if defined(BOOST_ASIO_WINDOWS) || defined(__CYGWIN__)
# define BOOST_ASIO_WIN_OR_POSIX(e_win, e_posix) e_win
#else
# define BOOST_ASIO_WIN_OR_POSIX(e_win, e_posix) e_posix
#endif

First question therefore: is __CYGWIN__ defined during your build?

Upvotes: 2

Alexey Zhivotov
Alexey Zhivotov

Reputation: 101

boost::asio::deadline_timer does not have default empty constructor. you should use:

boost::asio::io_service _iosvc;
boost::asio::deadline_timer timer(_iosvc);

Upvotes: 3

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