StructVariant

1 @serdeIgnoreUnexpectedKeys
2 struct Named
3 {
4 	string name;
5 }
6 
7 @serdeIgnoreUnexpectedKeys
8 struct Person
9 {
10 	string name;
11 	int age;
12 }
13 
14 @serdeIgnoreUnexpectedKeys
15 struct Place
16 {
17 	string name;
18 	double lat, lon;
19 }
20 
21 StructVariant!(Named, Person, Place) var = Person("Bob", 32);
22 
23 assert(var.serializeJson == `{"name":"Bob","age":32}`);
24 
25 Named extractedNamed;
26 Person extractedPerson;
27 Place extractedPlace;
28 assert(var.tryExtract!Named(extractedNamed));//, var.mismatchMessage!Named(var.value));
29 assert(var.tryExtract!Person(extractedPerson));//, var.mismatchMessage!Person(var.value));
30 assert(!var.tryExtract!Place(extractedPlace));//, var.mismatchMessage!Place(var.value));
31 
32 try
33 {
34 	var.extract!Place();
35 	assert(false);
36 }
37 catch (Exception e)
38 {
39 	// assert(e.msg == "missing required key lat\nmissing required key lon", e.msg);
40 	assert(e.msg == "can't extract Place from effective Person", e.msg);
41 }
42 
43 assert(extractedNamed.name == "Bob");
44 assert(extractedPerson == Person("Bob", 32));
45 assert(extractedPlace is Place.init);
46 
47 var = `{"name":"new name"}`.deserializeJson!(typeof(var));
48 assert(var.extract!Named.name == "new name");
49 assert(!var.tryExtract!Person(extractedPerson));
50 assert(!var.tryExtract!Place(extractedPlace));
51 
52 assert(var.extract!Named.name == "new name");
53 assertThrown({
54 	var = `{"nam":"name"}`.deserializeJson!(typeof(var));
55 }());
56 assert(var.extract!Named.name == "new name");
57 
58 assertThrown({
59 	var = `"hello"`.deserializeJson!(typeof(var));
60 }());