Implement iterator for JSONHashTable and JSONArray

[shreyasbharath]

Something like this -

for ( auto i = jsonHashTable.begin(), i != jsonHashTable.end(); i++ ) {
    cout << "Key " << i->first;
    cout << "Value" << i->second;
}

for ( auto i = jsonArray.begin(), i != jsonArray.end(); i++ ) {
    cout << "Value" << *i;
}

I think this will involve writing a custom iterator (see http://www.cplusplus.com/reference/iterator/) for these two classes, hopefully it isn't too difficult.

[bblanchon]

The original design of the parser API doesn't allow such feature.
So I implemented this feature as a part of a new API for the parser.

Old parser API:

JsonHashTable root = parser.parseHashTable(json);

char*  sensor    = root.getString("sensor");
long   time      = root.getLong("time");
double latitude  = root.getArray("data").getDouble(0);
double longitude = root.getArray("data").getDouble(1);

New parser API:

JsonObject root = parser.parse(json);

char*  sensor    = root["sensor"];
long   time      = root["time"];
double latitude  = root["data"][0];
double longitude = root["data"][1];

Iterators, with C++11 syntax:

for (auto i : jsonHashTable) {
    cout << "Key " << i.key();
    cout << "Value" << (const char*)i->value();
}

for (const char* i : jsonArray) {
    cout << "Value" << i;
}

The code is available in the new-parser-api branch

Please give me your feedback.

[bblanchon]

I merged the branch into master, it's now part of version 3.0

[shreyasbharath]

Thank you, we will upgrade to the new version soon!