Demo of Parsing objects using instances of JSONValue

dparsingjsonvalueretain.d

/*
 * http://johan.heapsource.com
 */

import std.stdio;
import std.json;

JSONValue doc;

void main() {
    parseMyDoc();
    printMyDoc();
}

void parseMyDoc() {
    JSONValue v = parseJSON(q{
        {"a":2, "b":{"c":20}}
    });
    doc = v;
}

void printMyDoc() {
    string str = toJSON(&doc, true);
    writeln(str);
}

// (Output)
/*
{
    "a": 2,
    "b": {
        "c": 20
    }
}
*/

dparsingobjectinvalidretain.d

/*
 * http://johan.heapsource.com
 */

import std.stdio;
import std.json;

JSONValue * doc;

void main() {
    parseMyDoc();
    printMyDoc();
}

void parseMyDoc() {
    JSONValue v = parseJSON(q{
        {"a":2, "b":{"c":20}}
    });
    doc = &v;
}

void printMyDoc() {
    string str = toJSON(doc, true);
    writeln(str);
}

// (Undefined behavior or Segmentation Fault)

dparsingobjects.d

/*
 * http://johan.heapsource.com
 */

import std.stdio;
import std.json;

void main() {
    JSONValue * v = new JSONValue;
    *v = parseJSON(q{
        {"a":2, "b":{"c":20}}
    });
    string str = v.toJSON(true);
    writeln(str);
}

// (Output)
/*
{
    "a": 2,
    "b": {
        "c": 20
    }
}
*/

dparsingvalues.d

/*
 * http://johan.heapsource.com
 */

import std.stdio;
import std.json;

void main() {
    JSONValue v = parseJSON(q{
        {"a":2, "b":{"c":20}}
    });
    string str = toJSON(&v, true);
    writeln(str);
}

// (Output)
/*
{
    "a": 2,
    "b": {
        "c": 20
    }
}
*/