#include #include "NullTileBehavior.h" using namespace std; NullTileBehavior NullTileBehavior::instance {""}; void NullTileBehavior::update(Tile &) { } unique_ptr NullTileBehavior::clone(Museum & museum) { auto instance = new NullTileBehavior(); instance->museum = &museum; return unique_ptr(instance); }