Registering types from a boost mpl vector

Question

std::string a= "a";
std::string b= "b";
std::string c= "c";

typedef mpl::vector<EasyFixEngineA,EasyFixEngineB,EasyFixEngineC> vecType;

RegisterInFactory<EasyFixEngine, mpl::at_c<vecType,0>::type>    registerA( a); 
RegisterInFactory<EasyFixEngine, mpl::at_c<vecType,1>::type,>   registerB( b);  
RegisterInFactory<EasyFixEngine, mpl::at_c<vecType,2>::type>    registerC( c); 

How can I generate automatically the last 3 lines by using boost::mpl ? By automatically I mean don't have to repeat 3 times the "same" line

Answer 1

One possibility utilizing mpl::for_each:

#include <boost/mpl/vector.hpp>
#include <boost/mpl/for_each.hpp>

struct EasyFixEngineA { static const char* const name() { return "a"; } };
struct EasyFixEngineB { static const char* const name() { return "b"; } };

struct Registrator {
    template<class T> void operator()(T t) {
        RegisterInFactory<EasyFixEngine, T> dummy(T::name());
    }
};

// ...
typedef boost::mpl::vector<EasyFixEngineA,EasyFixEngineB> Engines;
boost::mpl::for_each<Engines>(Registrator());

If the instantiation of T isn't suitable in your case, see this question.