I seem to have found an inconsistency in how fusion::find works with fusion::vector and an adapted struct. Basically, attempting to find a non-const type on a const vector with a non-const member works but requires a const-member find for an adapted struct. (See code below). Is this something that was just overlooked or there a technical reason for this behavior. In any case is there some way to identify a adapted struct in the general case (as apposed to the tag of the specific type) that can be used for a workaround?

Thanks in advance,
Mike

#include <boost/fusion/adapted/struct/adapt_struct.hpp>

#include <boost/fusion/container/vector/vector.hpp>

#include <boost/fusion/algorithm/query/find.hpp>


#include <boost/type_traits.hpp>


#include <string>

#include <iostream>


namespace b = boost;

namespace bf = boost::fusion;


namespace demo

{

    struct employee

    {

        std::string name;

        int age;

    };

}


// demo::employee is now a Fusion sequence

BOOST_FUSION_ADAPT_STRUCT(

    demo::employee,

    (std::string, name)

    (int, age))


int main(void)

{

  typedef bf::vector<int,float> V1;

  

  // Find against non-const V1

  V1 v1(1,2.0);


  BOOST_MPL_ASSERT_NOT(( b::is_same<bf::result_of::find<V1,int>::type,bf::result_of::end<V1>::type> ));


  assert(*bf::find<int>(v1) == 1);



  // Find against const V1

  const V1 const_v1(3,4.0);


  BOOST_MPL_ASSERT_NOT(( b::is_same<bf::result_of::find<const V1,int>::type,bf::result_of::end<const V1>::type> ));


  assert(*bf::find<int>(const_v1) == 3);


  // Find against non-const employee

  demo::employee e1 = {"Foo",18};


  BOOST_MPL_ASSERT_NOT(( b::is_same<bf::result_of::find<demo::employee,int>::type,bf::result_of::end<demo::employee>::type> ));


  assert(*bf::find<int>(e1) == 18);


  // Find against const employee

  const demo::employee const_e1 = {"Bar",21};


#if 0

  BOOST_MPL_ASSERT_NOT(( b::is_same<bf::result_of::find<const demo::employee,int>::type,bf::result_of::end<const demo::employee>::type> ));


  assert(*bf::find<int>(const_e1) == 21);

#else

  // note that the find key is a const int for this to work and is inconsistent with fusion::vector

  BOOST_MPL_ASSERT_NOT(( b::is_same<bf::result_of::find<const demo::employee,const int>::type,bf::result_of::end<const demo::employee>::type> ));


  assert(*bf::find<const int>(const_e1) == 21);

#endif


  return 0;

}