cpp_mpl_type_remap.cpp

// Example program
#include <iostream>
#include <string>
#include <vector>
#include <type_traits>

struct point
{
    float x, y, z;
};

struct point2D
{
    float x, y;
};

template <class T, typename MapFunctor>
auto map(const std::vector<T> & inVector, const MapFunctor  & functor)
{
    typedef typename std::result_of< MapFunctor(const T &) >::type ReturnType;
    std::vector<ReturnType> outVector;
    
    for(const T & data : inVector)
        outVector.push_back(functor(data));
        
    return outVector;
}

int main()
{
    std::vector<point> points = {{1.f,2.f,3.f}};
    
    auto coords = map(points, [](const point & p)->point2D
    {
        return point2D{p.x, p.y};
    });
    
    for(auto data : coords)
        std::cout<< data.x << " " << data.y << std::endl;
    
    return 0;
}