for loop elimination

Question

I\'d like to use the indices trick to eliminate for loops in my C++11 program (similar to forced -funroll-loops).

Here\'s an example:

Answer 1

Try this ( http://liveworkspace.org/code/e65a81d0d3e9b17692713fd3e9d681f5 ):

template<unsigned...> struct indices {};

template<unsigned S, unsigned E, unsigned... Is> struct indices_gen
  : indices_gen<S, E-1, E-1, Is...>
{};

template<unsigned S, unsigned... Is> struct indices_gen<S, S, Is...> : indices<Is...>
{};

Working example: http://liveworkspace.org/code/3d0ba21cc637a61c3e63d2db002f87af

Edit : Check Xeo's comment. Above example don't check if S < E, so it can go bad if you make a mistake. This (Xeo's code) will return a compiler error in such case: http://liveworkspace.org/code/81205e13334e89537bdc0b79b3ba56fc