// Create a stack and a list of shared pointers to maps, // and demonstrate sharing and cloning of maps. #define i_static #include #define i_type Map #define i_key_str // strings #define i_val int #define i_keydrop(p) (printf("drop name: %s\n", cstr_str(p)), cstr_drop(p)) #include #define i_type Arc // (atomic) ref. counted type #define i_val Map #define i_valdrop(p) (printf("drop Arc:\n"), Map_drop(p)) // no need for atomic ref. count in single thread: #define i_opt c_no_atomic|c_no_cmp|c_no_clone #include #define i_type Stack #define i_valboxed Arc // define i_valboxed for carc/cbox value (not i_val) #define i_opt c_no_cmp #include #define i_type List #define i_valboxed Arc // as above #define i_opt c_no_cmp #include int main() { c_auto (Stack, stack) c_auto (List, list) { // POPULATE stack with shared pointers to Maps: Map *map; map = Stack_push(&stack, Arc_from(Map_init()))->get; Map_emplace(map, "Joey", 1990); Map_emplace(map, "Mary", 1995); Map_emplace(map, "Joanna", 1992); map = Stack_push(&stack, Arc_from(Map_init()))->get; Map_emplace(map, "Rosanna", 2001); Map_emplace(map, "Brad", 1999); Map_emplace(map, "Jack", 1980); // POPULATE list: map = List_push_back(&list, Arc_from(Map_init()))->get; Map_emplace(map, "Steve", 1979); Map_emplace(map, "Rick", 1974); Map_emplace(map, "Tracy", 2003); // Share two Maps from the stack with the list using emplace (clone the carc): List_push_back(&list, Arc_clone(stack.data[0])); List_push_back(&list, Arc_clone(stack.data[1])); // Clone (deep copy) a Map from the stack to the list // List will contain two shared and two unshared maps. map = List_push_back(&list, Arc_from(Map_clone(*stack.data[1].get)))->get; // Add one more element to the cloned map: Map_emplace_or_assign(map, "CLONED", 2021); // Add one more element to the shared map: Map_emplace_or_assign(stack.data[1].get, "SHARED", 2021); puts("STACKS"); c_foreach (i, Stack, stack) { c_forpair (name, year, Map, *i.ref->get) printf(" %s:%d", cstr_str(_.name), *_.year); puts(""); } puts("LIST"); c_foreach (i, List, list) { c_forpair (name, year, Map, *i.ref->get) printf(" %s:%d", cstr_str(_.name), *_.year); puts(""); } } }