JPark

Quick Start

This project includes git submodules, use the --recursive flag when cloning.

git clone --recursive git@github.com:mpark/jpark.git

Major Concepts

Static JSON Schema

The following are the currently supported JSON schemas:

json::boolean
json::number
json::string
json::array(<schema>) e.g. json::array(json::number)
json::object<Type>(json::field(<name>, <source>, <schema>), ...) e.g. json::object<Person>(json::field("Name", &Person::name, json::string))

Apply the schema to an instance

All of the schemas mentioned above has an operator() which projects the schema onto an instance. For example, we can apply the json::boolean onto true:

std::cout << json::boolean(true) // prints: true

Example

#include <json.hpp>

#include <string>
#include <vector>

struct Person {
  std::string first_name;
  std::string last_name;
  double height;
  std::vector<std::string> friends;
};

int main() {
  Person person{"J", "Park", 180, {"Moris"}};
  // Only extract the first/last name.
  auto name = json::object<Person>(
    json::field("first name", &Person::first_name, json::string),
    json::field("last name", &Person::last_name, json::string)
  );
  // {"first name":"J","last name":"Park"}
  std::cout << name(person) << std::endl;
  // Full info.
  auto full = json::object<Person>(
    json::field("given name", &Person::first_name, json::string),
    json::field("surname", &Person::last_name, json::string),
    json::field("height", &Person::height, json::number),
    json::field("friends", &Person::friends, json::array(json::string))
  );
  // {"given name":"J","surname":"Park","height":180,"friends":["Moris"]}
  std::cout << full(person) << std::endl;
}

Requirements

This library requires a standard conformant C++11 compiler.

The following configurations were successfully tested:

Mac OS X Yosemite: Clang 3.5, 3.6, Apple (with libc++)

mpark / jpark