multiply with power of 2

//
//  main.cpp
//  TestMulti
//
//  Created by Rizky Herucakra on 7/1/13.
//  Copyright (c) 2013 Rizky Herucakra. All rights reserved.
//

#include <iostream>

template<size_t v> struct antilog2;

template<> struct antilog2<1>{
    enum { result = 0};
};

template<> struct antilog2<2>{
    enum { result = 1};
};

template<> struct antilog2<4>{
    enum { result = 2};
};
template<> struct antilog2<8>{
    enum { result = 3};
};
template<> struct antilog2<16>{
    enum { result = 4};
};



template <size_t m,typename T>
T mul_sh(T val){
    return val << antilog2<m>::result;
}


int main(int argc, const char * argv[])
{

    std::cout << "result = " << mul_sh<2>(5);
}