有什么办法解决这个问题吗?
在 ubuntu 8.10 w/g++ 4.3.2 上使用 1.39_0
在下面的状态图中,短语“BUGGY”打印了三个 次。人们会期望该事件只会触发一个“BUGGY”。在 就我正在进行的项目而言,我无法返回 discard_event() 因为我需要事件达到多个状态(通常 深入一组正交状态)。如果有解决方法 可以应用而不是修改状态图,我想知道。
$猫虫.cpp
#include <boost/intrusive_ptr.hpp>
#include <boost/mpl/list.hpp> #include <boost/statechart/custom_reaction.hpp>
#include <boost/statechart/event.hpp>
#include <boost/statechart/simple_state.hpp>
#include <boost/statechart/state.hpp>
#include <boost/statechart/state_machine.hpp>
#include <iostream>
using namespace std;
namespace sc = boost::statechart;
namespace mpl = boost::mpl;
struct evSay : sc::event<evSay>{ };
struct top;
struct c1;
struct c2;
struct c3;
struct sm : public sc::state_machine<sm,top> { };
struct top : sc::simple_state<top,sm,mpl::list<c1,c2,c3> > {
typedef sc::custom_reaction<evSay> reactions;
sc::result react(const evSay &) {
cout<<"BUGGY"<<endl;
return forward_event();
}
};
struct c1 : sc::simple_state <c1, top::orthogonal<0> > { };
struct c2 : sc::simple_state <c2, top::orthogonal<1> > { };
struct c3 : sc::state <c3, top::orthogonal<2> > {
c3( my_context ctx) : my_base(ctx) {
post_event( boost::intrusive_ptr< evSay > (
new evSay() ) );
}
};
int main() {
sm* fsm = new sm();
fsm->initiate();
delete fsm;
return 0;
}
$ g++ bug.cpp && ./a.out
buggy
buggy
buggy
编辑::
这是一个示例状态机,显示了我在实际处理的更大的问题中遇到的问题。我知道top会转发evSay。请注意,c1、c2、c3 不会对 evSay 使用react。这是我需要转发的示例,以便两个状态可以对 evSay 使用react。
#include <boost/intrusive_ptr.hpp>
#include <boost/mpl/list.hpp>
#include <boost/statechart/custom_reaction.hpp>
#include <boost/statechart/event.hpp>
#include <boost/statechart/simple_state.hpp>
#include <boost/statechart/state.hpp>
#include <boost/statechart/state_machine.hpp>
#include <iostream>
using namespace std;
namespace sc = boost::statechart;
namespace mpl = boost::mpl;
namespace BUG {
struct evSay : sc::event<evSay>{ };
struct top;struct c1;struct c2;struct c3;struct c2_1;
struct sm : public sc::state_machine<sm,top> { };
struct top : sc::simple_state<top,sm,mpl::list<c1,c2,c3> > {
typedef sc::simple_state<top,sm,mpl::list<c1,c2,c3> > my_type;
typedef sc::custom_reaction<evSay> reactions;
sc::result react(const evSay &) {
cout<<"BUGGY"<<endl;
return forward_event();
}
};
struct c1 : sc::simple_state <c1, top::orthogonal<0> > { };
struct c2 : sc::simple_state <c2, top::orthogonal<1>, c2_1 > { };
struct c3 : sc::state <c3, top::orthogonal<2> > {
c3( my_context ctx) : my_base(ctx) {
post_event( boost::intrusive_ptr< evSay > (
new evSay() ) );
}
};
struct c2_1 : sc::simple_state<c2_1, c2 > {
typedef sc::custom_reaction<evSay> reactions;
sc::result react(const evSay &) {
cout<<"CHILD REACTION"<<endl;
return forward_event();
}
};
}
int main()
{
BUG::sm* fsm = new BUG::sm();
fsm->initiate();
delete fsm;
return 0;
}
输出:
buggy
child react
buggy
buggy
最佳答案
将您想要的 react 向下移动到 top
状态的子状态。这将它从 forward_state
事件行中取出。我没有将它实现为内部类型,但你可以。
#include <boost/intrusive_ptr.hpp>
#include <boost/mpl/list.hpp>
#include <boost/statechart/custom_reaction.hpp>
#include <boost/statechart/event.hpp>
#include <boost/statechart/simple_state.hpp>
#include <boost/statechart/state.hpp>
#include <boost/statechart/state_machine.hpp>
#include <iostream>
using namespace std;
namespace sc = boost::statechart;
namespace mpl = boost::mpl;
struct evSay : sc::event<evSay>{ };
struct top;struct c1;struct c2;struct c3;struct c2_1;struct sub_1;
struct sm : public sc::state_machine<sm,top> { };
struct top : sc::simple_state<top,sm, mpl::list<c1,c2,c3, sub_1> > { };
struct sub_1 : sc::simple_state<sub_1, top::orthogonal<3> > {
typedef sc::custom_reaction<evSay> reactions;
sc::result react(const evSay &) {
cout<<"PARENT REACTION"<<endl;
return forward_event();
}
};
struct c1 : sc::simple_state <c1, top::orthogonal<0> > { };
struct c2 : sc::simple_state <c2, top::orthogonal<1>, c2_1 > { };
struct c3 : sc::simple_state <c3, top::orthogonal<2> > { };
struct c2_1 : sc::simple_state<c2_1, c2 > {
typedef sc::custom_reaction<evSay> reactions;
sc::result react(const evSay &) {
cout<<"CHILD REACTION"<<endl;
return forward_event();
}
};
int main()
{
sm* fsm = new sm();
fsm->initiate();
fsm->process_event( evSay() );
delete fsm;
return 0;
}
~$g++ test.cpp -I Downloads/boost_1_45_0
~$./a.out
child react
家长 react
关于c++ - 帮助 Boost.Statechart 错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/1048904/