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#include <string>
#include <iostream>
#include <unordered_map>
#include <vector>
//simple really, to refer to a class from a pointer to the base class, the base class must refer to every member
//how to make a factory for a derived class carrying settings in the constructor
using namespace std;
class Node { //abstract base class
public:
virtual string get_name(){}; //base class
virtual Node* clone(unordered_map<string,string> &_settings){};
void set(unordered_map<string,string> &_settings){settings=_settings;type=settings["type"];};
unordered_map<string,string> settings;
string get_type(){ return type; };
string type;
};
class Node_o: public Node {
public:
virtual string get_occupation(){}; //needs to be an abstract subclass implementing the interface
};
class A_node: public Node_o {
public:
A_node(){};
A_node(unordered_map<string,string> &_settings){
settings=_settings;
type=_settings["type"];
cout << "making a " << type << endl;
};
A_node* clone(unordered_map<string,string> &_settings) { return new A_node(_settings);};
string get_name(){ return "A"; };
string get_occupation(){ return "an A"; };
};
class B_node: public Node_o {
public:
B_node(){};
B_node(unordered_map<string,string> &_settings) {
settings=_settings;
type=_settings["type"];
cout << "making a " << type << endl;
};
B_node* clone(unordered_map<string,string> &_settings) { return new B_node(_settings);};
string get_name(){ return "B"; };
string get_occupation(){ return "a B"; };
};
class C_node: public Node_o {
public:
C_node(){};
C_node(unordered_map<string,string> &_settings) {
settings=_settings;
type=_settings["type"];
cout << "making a " << type << endl;
};
C_node* clone(unordered_map<string,string> &_settings) { return new C_node(_settings);};
string get_name(){ return settings["type"]; };
string get_occupation(){ return "C node"; };
};
class Node_factory {
public:
template <typename T>
T* clone(T* proto) {
cout << "cloning.. " << endl;
return new T();
};
Node_factory() {
add_type("A",new A_node());
add_type("B",new B_node());
add_type("C",new C_node());
}
Node *get_node(string type) {
if (type=="A") return new A_node();
if (type=="B") return new B_node();
if (type=="C") return new C_node();
};
unordered_map<string,Node*> type_map;
void add_type(string type,Node *proto){
type_map[type]=proto;
};
Node *create(unordered_map<string,string> &settings) {
if (settings.find("type")!=settings.end()) {
if (type_map.find(settings["type"])!=type_map.end()) {
return type_map[settings["type"]]->clone(settings);
}
}
}
Node *create(string type,unordered_map<string,string> &settings) {
if (settings.find("type")!=settings.end()) {
if (type_map.find(settings["type"])!=type_map.end()) {
Node* t=clone(type_map[settings["type"]]);
cout << "cloned.. " << endl;
t->set(settings);
return t;
//T* t= new T();
}
}
}
//so when you get a pointer from an array of pointers to base class, thats all you get
/*
Node *create(string type) {
if (type_map.find(type)!=type_map.end()) {
return (Node*)clone(type_map[type]);
}
}
Node *create(string type,string desc) {
if (type_map.find(type)!=type_map.end()) {
return (Node*)clone(type_map[type],desc);
}
}
*/
};
int main() {
Node_factory f=Node_factory();
unordered_map<string,string> settings;
vector<Node*> nodes;
settings["type"]="A";
nodes.push_back(f.create("A",settings));
settings["type"]="B";
nodes.push_back(f.create(settings));
settings["type"]="C";
//nodes.push_back(f.create(settings));
for (auto &i: nodes) {
//cout << ((Node_o*)i)->get_type() << ", " << ((Node_o*)i)->get_occupation()<< endl;
cout << ((Node_o*)i)->get_occupation()<< endl;
}
}
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