cpp-json

Runtime dynamic json type for C++.

Introduction

This component was taken from folly, with efforts porting to Visual C++ 2013.

Build

Obtain premake4.

Type premake4 vs2013 on Windows or premake4 gmake on Linux

Build

To build the library and test suits(on Windows)

1. Obtain boost library(http://boost.org)
2. Set environment variable BOOST_ROOT as directory path of boost library
3. Obtain premake4.
4. Type premake4 vs2013 on Windows or premake4 gmake on Linux

Usage

dynamic twelve = 12; // creates a dynamic that holds an integer
dynamic str = "string"; // yep, this one is an string

// A few other types.
dynamic nul = nullptr;
dynamic boolean = false;

// Arrays can be initialized with brackets.
dynamic array = { "array ", "of ", 4, " elements" };
assert(array.size() == 4);
dynamic emptyArray = {};
assert(array.empty());

// Maps from dynamics to dynamics are called objects.  The
// dynamic::object constant is how you make an empty map from dynamics
// to dynamics.
dynamic map = dynamic::object;
map["something"] = 12;
map["another_something"] = map["something"] * 2;

// Dynamic objects may be intialized this way
dynamic map2 = dynamic::object("something", 12)("another_something", 24);

// Parsing JSON strings and using them.
std::string jsonDocument = "({\"key\":12,\"key2\":[false, null, true, \"yay\"]})";
dynamic parsed = parseJson(jsonDocument);
assert(parsed["key"] == 12);
assert(parsed["key2"][0] == false);
assert(parsed["key2"][1] == nullptr);

// Building the same document programatically.
dynamic sonOfAJ = dynamic::object
  ("key", 12)
  ("key2", { false, nullptr, true, "yay" });

// Printing.  (See also toPrettyJson)
auto str = toJson(sonOfAJ);
assert(jsonDocument.compare(str) == 0);