JsonParser2

A tool for deserializing objects from json files

Typical Usage

Single Object

Call the function parsedObject templated on the desired class and give the path to the json file as an argument.

int main()
{
  auto const person = JsonParser::parsedObject<Person>("SavedPerson.json");
  std::cout << person.name << " is " << person.age << std::endl;
}

Multiple Objects

Call the function parsedList to get a list of your objects.

int main()
{
  auto const people = JsonParser::parsedList<Person>("SavedPeople.json");
  for (auto const& person : people)
    std::cout << person.name << " is " << person.age << std::endl;
}

Abstract Objects

Call the function parsedObject templated on a unique pointer to your abstract class to get a unique pointer of abstract type to a concrete object

int main()
{
  Exposable<IShape>::register_helper<IShapeExposingHelper>();
  using IShapeUP = std::unique_ptr<IShape>;
  auto const abstractShape = JsonParser::parsedObject<IShapeUP>("AbstractShape.json");
  std::cout << abstractShape->draw() << std::endl;
}

All You Need

To parse a concrete object

is...

1. Your class

struct Person
{
  std::string name;
  int age = 0;
};

2. Your class should inherit from the class Exposable templated on itself

struct Person : Exposable<Person>
{
  std::string name;
  int age = 0;
};

3. And it must provide a public method expose

struct Person : Exposable<Person>
{
  std::string name;
  int age = 0;
  static void expose();
};

4. The body of the method should list all the pairs of tags and pointers to members you want to deserialize

struct Person : Exposable<Person>
{
  std::string name;
  int age = 0;
  static void expose()
  {
    Exposable<Person>::expose("name", &Person::name);
    Exposable<Person>::expose("age", &Person::age);
  }
};

See tests for further examples.

To parse an abstract object

TODO: add detailed manual

See tests for further examples.

Supported Types

Basic

• std::string
• bool
• std::unique_ptr

Integral

• shor
• unsigned short
• int
• unsigned int
• long
• unsigned long
• long long
• unsigned long long

Containers

• std::vector
• std::list