back/state_machine.hpp doesn`t compile with gcc 4.0.x version

[anonymous]

Here is small patch that resolve problem.

Compilation errors look like following:

/home/esuitebuild/boost_1_45_0/boost/msm/back/state_machine.hpp:2192: error: 'template<class StateType> typename boost::enable_if<typename boost::msm::back::is_no_message_queue<StateType>:\ :type, void>::type boost::msm::back::state_machine::process_message_queue(StateType*) [with StateType = StateType, Derived = net2::proto::a2s::client::machine_fe_t::st_connected_, HistoryP\ olicy = boost::msm::back::NoHistory, CompilePolicy = boost::msm::back::favor_runtime_speed]' cannot be overloaded /home/esuitebuild/boost_1_45_0/boost/msm/back/state_machine.hpp:2181: error: with 'template<class StateType> typename boost::disable_if<typename boost::msm::back::is_no_message_queue<State\ Type>::type, void>::type boost::msm::back::state_machine::process_message_queue(StateType*) [with StateType = StateType, Derived = net2::proto::a2s::client::machine_fe_t::st_connected_, Hi\ storyPolicy = boost::msm::back::NoHistory, CompilePolicy = boost::msm::back::favor_runtime_speed]' /home/esuitebuild/boost_1_45_0/boost/msm/back/state_machine.hpp: In instantiation of 'boost::msm::back::state_machine<net2::proto::a2s::client::machine_fe_t, boost::msm::back::NoHistory, b\ oost::msm::back::favor_runtime_speed>': /home/esuitebuild/boost_1_45_0/boost/msm/back/state_machine.hpp:2192: error: 'template<class StateType> typename boost::enable_if<typename boost::msm::back::is_no_message_queue<StateType>:\ :type, void>::type boost::msm::back::state_machine::process_message_queue(StateType*) [with StateType = StateType, Derived = net2::proto::a2s::client::machine_fe_t, HistoryPolicy = boost::\ msm::back::NoHistory, CompilePolicy = boost::msm::back::favor_runtime_speed]' cannot be overloaded /home/esuitebuild/boost_1_45_0/boost/msm/back/state_machine.hpp:2181: error: with 'template<class StateType> typename boost::disable_if<typename boost::msm::back::is_no_message_queue<State\ Type>::type, void>::type boost::msm::back::state_machine::process_message_queue(StateType*) [with StateType = StateType, Derived = net2::proto::a2s::client::machine_fe_t, HistoryPolicy = b\ oost::msm::back::NoHistory, CompilePolicy = boost::msm::back::favor_runtime_speed]'

[anonymous]

I can`t attach patch file, may be some problems with traq. Post it here diff -rub boost_1_45_0_old/boost/msm/back/state_machine.hpp boost_1_45_0/boost/msm/back/state_machine.hpp --- boost_1_45_0_old/boost/msm/back/state_machine.hpp 2010-12-03 17:04:12.000000000 +0300 +++ boost_1_45_0/boost/msm/back/state_machine.hpp 2011-01-25 13:36:43.000000000 +0300 @@ -1775,7 +1775,7 @@

the IBM compiler seems to have problems with nested classes the same seems to apply to the Apple version of gcc 4.0.1 (just in case we do for < 4.1) and also to MS VC < 8

-#if defined (IBMCPP) +#if defined (IBMCPP)

(defined (APPLE_CC) && (GNUC == 4 && GNUC_MINOR < 1))	(defined(_MSC_VER) && (_MSC_VER < 1400))
(GNUC == 4 && GNUC_MINOR < 1)	(defined(_MSC_VER) && (_MSC_VER < 1400))

public:

#endif

template<class ContainingSM>

@@ -1784,7 +1784,7 @@

m_is_included=true; ::boost::fusion::for_each(m_substate_list,add_state<ContainingSM>(this,sm));

}

-#if defined (IBMCPP) +#if defined (IBMCPP)

(defined (APPLE_CC) && (GNUC == 4 && GNUC_MINOR < 1))	(defined(_MSC_VER) && (_MSC_VER < 1400))
(GNUC == 4 && GNUC_MINOR < 1)	(defined(_MSC_VER) && (_MSC_VER < 1400))

private:

#endif

A function object for use with mpl::for_each that stuffs

@@ -2177,8 +2177,7 @@

} removes one event from the message queue and processes it template <class StateType>

• typename ::boost::disable_if<typename is_no_message_queue<StateType>::type,void >::type
• process_message_queue(StateType*)

+ void process_message_queue(StateType*, typename ::boost::disable_if<typename is_no_message_queue<StateType>::type,void >::type* = 0)

{

if (!m_events_queue.m_events_queue.empty()) {

@@ -2188,8 +2187,7 @@

}

} template <class StateType>

• typename ::boost::enable_if<typename is_no_message_queue<StateType>::type,void >::type
• process_message_queue(StateType*)

+ void process_message_queue(StateType*, typename ::boost::enable_if<typename is_no_message_queue<StateType>::type,void >::type* = 0)

{

nothing to process

}

[Christophe Henry]

Ah, this is interesting. Here the link to the corresponding previous discussion: ​http://lists.boost.org/Archives/boost/2010/09/171281.php

It seems that the problem is not limited to Apple. What OS are you using?

Will be fixed for 1.47 (1.46 is closed). Fixed in trunk (rev 68535).

Thanks, Christophe