Re: [Boost-users] [statechart] - problem withsc::transition<> ->invalid useof'boost::statechart::detail::no_context::no_function [withEvent= jm::ffcp::ev_init]' to form a pointer-to-member-func

Zoltan \'cad\' Juhasz wrote:

Andreas Huber writes:

...

Please let me know how it goes.

Unfortunately not so well.

I downloaded the current version from CVS.

test_a == http://usalug.org/pastebin/pastebin.php?show=392 test_b == http://usalug.org/pastebin/pastebin.php?show=411

gcc41 == (GCC) 4.1.0 20060304 (Red Hat 4.1.0-3), gcc32 == (GCC) 3.2.3 20030502 (Red Hat Linux 3.2.3-55.fc5)

gcc41 test_a -> success

gcc41 test_b -> g++ -g -I /boost_1_34_alpha/ -std=c++98 -pedantic test.cpp -o test test.cpp: In constructor 'default_state<T>::default_state(typename boost::statechart::state, has_no_history>::my_context)': test.cpp:51: error: there are no arguments to 'post_event' that depend on a template parameter, so a declaration of 'post_event' must be available test.cpp:51: error: (if you use '-fpermissive', G++ will accept your code, but allowing the use of an undeclared name is deprecated) make: *** [debug34_test] Error 1

After studying the error a bit closer, I believe the problem lies in your code. If I'm not mistaken this is caused by the fact that post_event is called in a class template and is declared in a base that depends on a template parameter. Try this->post_event instead of post_event and the error should go away.

gcc32 test_a -> g++32 -g -I /boost_1_34_alpha/ -std=c++98 -pedantic test.cpp -o test In file included from test.cpp:17: /boost_1_34_alpha/boost/statechart/transition.hpp:48: no class template named ` no_context' in `boost::statechart::detail' test.cpp:38: object `<expression error>' cannot be used as template argument test.cpp:38: warning: ISO C++ forbids declaration of `reactions' with no type make: *** [debug3432_test] Error 1

gcc32 test_b -> g++32 -g -I /boost_1_34_alpha/ -std=c++98 -pedantic test.cpp -o test In file included from test.cpp:19: /boost_1_34_alpha/boost/statechart/transition.hpp:48: no class template named ` no_context' in `boost::statechart::detail' test.cpp:44: object `<expression error>' cannot be used as template argument test.cpp:44: warning: ISO C++ forbids declaration of `type name' with no type test.cpp:68:2: warning: no newline at end of file make: *** [debug3432_test] Error 1

I'm a bit stumped by these errors. It seems test_a is more than covered by the test case TransitionTest and the BitMachine example, both of which compile on gcc 3.2.3 on linux (see test results by Martin Wille).

PS: To tell the truth gcc41 is more inportant to me than gcc32, although with the "-fpermissive" flag, it can be compiled with gcc41... but it is still ugly. (I do not know what kinds of impact that flag implies.)

Ok, I think it should work when you prepend this-> before every base class method call that is made in a derived class template. -- Andreas Huber When replying by private email, please remove the words spam and trap from the address shown in the header.