Ticket #2335: insert_same_repeat.cpp

//Purpose:
//  Demonstrate the EBCO problem mentioned here in thread:
//    http://lists.boost.org/boost-users/2008/09/40552.php
//Result:
//  Problem doesn't occur with gcc snapshot:
//    ftp://gcc.gnu.org/pub/gcc/snapshots/4.4-20090519/gcc-4.4-20090519.tar.bz2
//

#include <boost/mpl/transform.hpp>
#include <boost/mpl/always.hpp>
#include <boost/mpl/range_c.hpp>
#include <boost/mpl/front_inserter.hpp>
#include <boost/fusion/include/vector.hpp>
#include <boost/fusion/include/mpl.hpp>

#include <iostream>
#include <typeinfo>

namespace boost{namespace mpl{
  template
  < typename T
  , typename Inserter
  , unsigned Size=0
  >
struct insert_same_repeat
/**@brief
 *  Repeat Inserter Size times on same value, T.
 *
 *  The body of this template is essentially
 *  a copy of Steven's code in the thread
 *  mentioned in Purpose: above.
 */
{
    // create a sequence of Size elements:
    typedef boost::mpl::range_c<int, 0, Size> range;
    // convert all the elements to T with Inserter:
    typedef typename boost::mpl::transform
      <range, boost::mpl::always<T>, Inserter>::type
      type;
};

}}

int main() {
    unsigned const count=2;
        typedef
      boost::mpl::insert_same_repeat
      < float
      , boost::mpl::front_inserter<boost::fusion::vector<> >
      , count
      >::type
    float_container_type;
    float_container_type float_container_valu;
    std::size_t size_float=sizeof(float);
    std::cout << typeid(float_container_type).name() << std::endl;
    std::cout << "count*sizeof(float)="<<count*size_float<< std::endl;
    std::cout << "sizeof(float_container_type)="<<sizeof(float_container_type)<< std::endl;
}