#ifndef FAST_WFC_DIRECTION_HPP_ #define FAST_WFC_DIRECTION_HPP_ constexpr int directions_x[4] = { 0, -1, 1, 0 }; constexpr int directions_y[4] = { -1, 0, 0, 1 }; constexpr unsigned get_opposite_direction(unsigned direction) { return 3 - direction; } #endif