please ignore, sorted out. I had to define explicit concepts, rather than the BOOST_TYPE_ERASURE_MEMBER http://www.boost.org/doc/libs/1_56_0/doc/html/BOOST_TYPE_ERASURE_MEMBER.html thanks -raj On Sun, Sep 28, 2014 at 12:48 AM, Raj Sambasivan wrote:

HI Boost-users/christophe, I'm trying to make use of type erasure for fsm based on suggestion from an earlier mail thread http://boost.2283326.n4.nabble.com/msm-access-to-root-fsm-td4649632.html but hitting compilation errors. Can you pls help?

while the any works as expected for push back e.g for vector (bottom of email) it doesnt work for MSM..

*Doesn't Work for MSM:*

BOOST_TYPE_ERASURE_MEMBER((has_process_event), process_event, 1)

typedef any, _self&> any_fsm;

struct AnyFSM

{

AnyFSM(any_fsm afsm_) : _afsm(afsm_) {}

void process(Event1& e) { _afsm.process_event(e); }

any_fsm _afsm;

}; TestFSM test; test.start(); AnyFSM(test); test.process(Event1());

*error:*

*test.cpp:47:43: **error: **'Event1' does not refer to a value*

typedef any, _self&> any_fsm;

*Works for vector:*

BOOST_TYPE_ERASURE_MEMBER((has_push_back), push_back, 1)

typedef any, _self&> any_container;

void append_many(any_container container) {

for(int i = 0; i < 10; ++i)

container.push_back(i);

}

struct AnyContainer

{

AnyContainer(any_container cont_) : _cont(cont_) {}

void append() {append_many(_cont); }

any_container _cont;

};

AnyContainer m(v);

m.append();

for(auto i : v)

{

std::cout << i << std::endl;

}

Thanks

-Raj