1 // Example program for matching summary functions and synthetic child providers.
2 //
3 // The classes here simulate code generated by a serialization tool like, for
4 // example, protocol buffers. But the actual "generated" class layout is
5 // extremely naive to simplify the example.
6 //
7 // The idea is that we want to have generic formatters for a bunch of message
8 // classes, because they are all generated following common patterns, but the
9 // matching can't be based in the type name, because it can be anything.
10
11 #include <string>
12
13 class Message {
14 // Dummy method definitions to illustrate a possible generic message API.
serialize()15 std::string serialize() { return "TODO"; }
deserialize()16 Message* deserialize() {
17 return nullptr; // TODO.
18 }
19 };
20
21 // This class could have been generated from a description like this. Assume
22 // fields are always optional, for simplicity (e.g. we don't care during
23 // serialization if a Customer has a name or not, we're just moving data around
24 // and validation happens elsewhere).
25 //
26 // message Customer {
27 // string name;
28 // int age;
29 // string address;
30 // }
31 class Customer : public Message {
32 private:
33 int _internal_bookkeeping_bits_;
34
35 // Presence bits. They are true if the field has been set.
36 bool _has_name_ = false;
37 bool _has_age_ = false;
38 bool _has_address_ = false;
39
40 // Actual field data.
41 std::string name_;
42 int age_;
43 std::string address_;
44
45 public:
46 // Getters and setters.
has_name()47 bool has_name() { return _has_name_; }
has_age()48 bool has_age() { return _has_age_; }
has_address()49 bool has_address() { return _has_address_; }
50
name()51 std::string name() { return name_; }
age()52 int age() { return age_; }
address()53 std::string address() { return address_; }
54
set_name(std::string name)55 void set_name(std::string name) {
56 name_ = name;
57 _has_name_ = true;
58 }
set_age(int age)59 void set_age(int age) {
60 age_ = age;
61 _has_age_ = true;
62 }
set_address(std::string address)63 void set_address(std::string address) {
64 address_ = address;
65 _has_address_ = true;
66 }
67 };
68
69 // message ProductOrder {
70 // string product_name;
71 // int amount;
72 // }
73 class ProductOrder : public Message {
74 private:
75 int _internal_bookkeeping_bits_;
76
77 // Presence bits. They are true if the field has been set.
78 bool _has_product_name_ = false;
79 bool _has_amount_ = false;
80
81 // Actual field data.
82 std::string product_name_;
83 int amount_;
84
85 public:
86 // Getters and setters.
has_product_name()87 bool has_product_name() { return _has_product_name_; }
has_amount()88 bool has_amount() { return _has_amount_; }
89
get_product_name()90 std::string get_product_name() { return product_name_; }
get_amount()91 int get_amount() { return amount_; }
92
set_product_name(std::string product_name)93 void set_product_name(std::string product_name) {
94 product_name_ = product_name;
95 _has_product_name_ = true;
96 }
set_amount(int amount)97 void set_amount(int amount) {
98 amount_ = amount;
99 _has_amount_ = true;
100 }
101 };
102
main(int argc,char ** argv)103 int main(int argc, char **argv) {
104 Customer customer;
105 customer.set_name("C. Ustomer");
106 customer.set_address("123 Fake St.");
107 // no age, so we can check absent fields get omitted.
108
109 ProductOrder order;
110 order.set_product_name("widget");
111 order.set_amount(100);
112 return 0; // break here.
113 }
114
115