void getObjData( LargeObj& a )
{
  a.reset() ;
  a.fillWithData() ;
}

int main()
{
  LargeObj a ;
  getObjData( a ) ;
}

LargeObj getObjData()
{
  LargeObj a ;
  a.fillWithData() ;
  return a ;
}

int main()
{
  LargeObj a = getObjData() ;
}

typedef std::vector<HugeObj> LargeObj ;

#include <iostream>
class X
{
public:
    X() { std::cout << "X::X()" << std::endl; }
    X( X const & ) { std::cout << "X::X( X const & )" << std::endl; }
    X& operator=( X const & ) { std::cout << "X::operator=(X const &)" << std::endl; }
};
X f() {
    X tmp;
    return tmp;
}
int main() {
    X x = f();
}

LargeObj&& getObjData()
{
  LargeObj a ;
  a.fillWithData() ;
  return a ;
}

int main()
{
  LargeObj a = getObjData(); // calls the move constructor
}

LargeObj getObjData()
{
  return LargeObj( fillsomehow() );
}

std::auto_ptr<LargeObj> getObjData()
{
  std::auto_ptr<LargeObj> a(new LargeObj);
  a->fillWithData();
  return a;
}

int main()
{
  std::auto_ptr<LargeObj> a(getObjData());
}

LargeObj::LargeObj() :
 m_member1(),
 m_member2(),
 ...
{}

LargeObj::LargeObj()
{
  // (The body of fillWithData should ideally be re-written into
  // the initializer list...)
  fillWithData() ;
}

int main()
{
  LargeObj a ;
}

class LargeObj : public std::vector<HugeObj> {
    // constructor that fills the object with data
    LargeObj() ;
    // ... other standard methods ...
};

LargeObj* getObjData()
{
  LargeObj* ret = new LargeObj;
  ret->fillWithData() ;
  return ret;
}