Hands-On Design Patterns with C++

Aggregate parameters

With aggregate parameters, we create a struct or a class that contains all the values, instead of adding one parameter per value. We don't have to be limited to one aggregate; for example, our city may take several structs, one for all terrain-related features that the game sets, and another for all features that the player controls directly:

struct city_features_t {    size_t number_of_buildings;    size_t number_of_towers;    size_t guard_strength;    enum center_t { KEEP, PALACE, CITADEL };    center_t center = KEEP;    bool with_forge = false;    bool with_granary = false;    bool with_temple;};struct terrain_features_t {    bool has_fresh_water;    bool is_coastal;    bool has_forest;    bool is_desert;}; class City {    public: City(city_features_t city_features, ...