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mongoc_collection_t *collection;
bson_t *pipeline = bson_new ();
bson_t opts = BSON_INITIALIZER;
mongoc_change_stream_t *stream;
const bson_t *change;
const bson_t *resume_token;
bson_error_t error;
collection = mongoc_database_get_collection (db, "inventory");
stream = mongoc_collection_watch (collection, pipeline, NULL /* opts */);
mongoc_change_stream_next (stream, &change);
if (mongoc_change_stream_error_document (stream, &error, NULL)) {
   MONGOC_ERROR ("%s\n", error.message);
}
mongoc_change_stream_destroy (stream);

var cursor = inventory.Watch();
while (cursor.MoveNext() && cursor.Current.Count() == 0) { } // keep calling MoveNext until we've read the first batch
var next = cursor.Current.First();
cursor.Dispose();

cs, err := coll.Watch(ctx, mongo.Pipeline{})
assert.NoError(t, err)
defer cs.Close(ctx)
ok := cs.Next(ctx)
next := cs.Current

MongoCursor<ChangeStreamDocument<Document>> cursor = inventory.watch().iterator();
ChangeStreamDocument<Document> next = cursor.next();

cursor = db.inventory.watch()
document = await cursor.next()

const collection = db.collection('inventory');
const changeStream = collection.watch();
changeStream.on('change', next => {
  // process next document
});

const collection = db.collection('inventory');
const changeStream = collection.watch();
const next = await changeStream.next();

$changeStream = $db->inventory->watch();
$changeStream->rewind();
$firstChange = $changeStream->current();
$changeStream->next();
$secondChange = $changeStream->current();

cursor = db.inventory.watch()
next(cursor)

cursor = inventory.watch.to_enum
next_change = cursor.next

let inventory = db.collection("inventory")
// Option 1: retrieve next document via next()
let next = inventory.watch().flatMap { cursor in
    cursor.next()
}
// Option 2: register a callback to execute for each document
let result = inventory.watch().flatMap { cursor in
    cursor.forEach { event in
        // process event
        print(event)
    }
}

let inventory = db.collection("inventory")
let changeStream = try inventory.watch()
let next = changeStream.next()

pipeline = BCON_NEW ("pipeline",
                     "[",
                     "{",
                     "$match",
                     "{",
                     "fullDocument.username",
                     BCON_UTF8 ("alice"),
                     "}",
                     "}",
                     "{",
                     "$addFields",
                     "{",
                     "newField",
                     BCON_UTF8 ("this is an added field!"),
                     "}",
                     "}",
                     "]");
stream = mongoc_collection_watch (collection, pipeline, &opts);
mongoc_change_stream_next (stream, &change);
if (mongoc_change_stream_error_document (stream, &error, NULL)) {
   MONGOC_ERROR ("%s\n", error.message);
}
mongoc_change_stream_destroy (stream);

var pipeline = new EmptyPipelineDefinition<ChangeStreamDocument<BsonDocument>>()
    .Match(change =>
        change.FullDocument["username"] == "alice" ||
        change.OperationType == ChangeStreamOperationType.Delete)
    .AppendStage<ChangeStreamDocument<BsonDocument>, ChangeStreamDocument<BsonDocument>, BsonDocument>(
        "{ $addFields : { newField : 'this is an added field!' } }");
var collection = database.GetCollection<BsonDocument>("inventory");
using (var cursor = collection.Watch(pipeline))
{
    while (cursor.MoveNext() && cursor.Current.Count() == 0) { } // keep calling MoveNext until we've read the first batch
    var next = cursor.Current.First();
}

pipeline := mongo.Pipeline{bson.D{{"$match", bson.D{{"$or",
	bson.A{
		bson.D{{"fullDocument.username", "alice"}},
		bson.D{{"operationType", "delete"}}}}},
}}}
cs, err := coll.Watch(ctx, pipeline)
assert.NoError(t, err)
defer cs.Close(ctx)
ok := cs.Next(ctx)
next := cs.Current

MongoClient mongoClient = MongoClients.create("mongodb://<username>:<password>@<host>:<port>");
// Select the MongoDB database and collection to open the change stream against
MongoDatabase db = mongoClient.getDatabase("myTargetDatabase");
MongoCollection<Document> collection = db.getCollection("myTargetCollection");
// Create $match pipeline stage.
List<Bson> pipeline = singletonList(Aggregates.match(Filters.or(
   Document.parse("{'fullDocument.username': 'alice'}"),
   Filters.in("operationType", asList("delete")))));
// Create the change stream cursor, passing the pipeline to the
// collection.watch() method
MongoCursor<Document> cursor = collection.watch(pipeline).iterator();

pipeline = [
    {"$match": {"fullDocument.username": "alice"}},
    {"$addFields": {"newField": "this is an added field!"}},
]
cursor = db.inventory.watch(pipeline=pipeline)
document = await cursor.next()

const pipeline = [
  { $match: { 'fullDocument.username': 'alice' } },
  { $addFields: { newField: 'this is an added field!' } }
];
const collection = db.collection('inventory');
const changeStream = collection.watch(pipeline);
changeStream.on('change', next => {
  // process next document
});

const changeStreamIterator = collection.watch(pipeline);
const next = await changeStreamIterator.next();

$pipeline = [
    ['$match' => ['fullDocument.username' => 'alice']],
    ['$addFields' => ['newField' => 'this is an added field!']],
];
$changeStream = $db->inventory->watch($pipeline);
$changeStream->rewind();
$firstChange = $changeStream->current();
$changeStream->next();
$secondChange = $changeStream->current();

pipeline = [
    {"$match": {"fullDocument.username": "alice"}},
    {"$addFields": {"newField": "this is an added field!"}},
]
cursor = db.inventory.watch(pipeline=pipeline)
next(cursor)

let pipeline: [BSONDocument] = [
    ["$match": ["fullDocument.username": "alice"]],
    ["$addFields": ["newField": "this is an added field!"]]
]
let inventory = db.collection("inventory")
// Option 1: use next() to iterate
let next = inventory.watch(pipeline, withEventType: BSONDocument.self).flatMap { changeStream in
    changeStream.next()
}
// Option 2: register a callback to execute for each document
let result = inventory.watch(pipeline, withEventType: BSONDocument.self).flatMap { changeStream in
    changeStream.forEach { event in
        // process event
        print(event)
    }
}

let pipeline: [BSONDocument] = [
    ["$match": ["fullDocument.username": "alice"]],
    ["$addFields": ["newField": "this is an added field!"]]
]
let inventory = db.collection("inventory")
let changeStream = try inventory.watch(pipeline, withEventType: BSONDocument.self)
let next = changeStream.next()

BSON_APPEND_UTF8 (&opts, "fullDocument", "updateLookup");
stream = mongoc_collection_watch (collection, pipeline, &opts);
mongoc_change_stream_next (stream, &change);
if (mongoc_change_stream_error_document (stream, &error, NULL)) {
   MONGOC_ERROR ("%s\n", error.message);
}
mongoc_change_stream_destroy (stream);

var options = new ChangeStreamOptions { FullDocument = ChangeStreamFullDocumentOption.UpdateLookup };
var cursor = inventory.Watch(options);
while (cursor.MoveNext() && cursor.Current.Count() == 0) { } // keep calling MoveNext until we've read the first batch
var next = cursor.Current.First();
cursor.Dispose();

cs, err := coll.Watch(ctx, mongo.Pipeline{}, options.ChangeStream().SetFullDocument(options.UpdateLookup))
assert.NoError(t, err)
defer cs.Close(ctx)
ok := cs.Next(ctx)
next := cs.Current

cursor = inventory.watch().fullDocument(FullDocument.UPDATE_LOOKUP).iterator();
next = cursor.next();

cursor = db.inventory.watch(full_document="updateLookup")
document = await cursor.next()

const collection = db.collection('inventory');
const changeStream = collection.watch([], { fullDocument: 'updateLookup' });
changeStream.on('change', next => {
  // process next document
});

const changeStreamIterator = collection.watch([], { fullDocument: 'updateLookup' });
const next = await changeStreamIterator.next();

$changeStream = $db->inventory->watch([], ['fullDocument' => \MongoDB\Operation\Watch::FULL_DOCUMENT_UPDATE_LOOKUP]);
$changeStream->rewind();
$firstChange = $changeStream->current();
$changeStream->next();
$secondChange = $changeStream->current();

cursor = db.inventory.watch(full_document="updateLookup")
next(cursor)

cursor = inventory.watch([], full_document: 'updateLookup').to_enum
next_change = cursor.next

let inventory = db.collection("inventory")
// Option 1: use next() to iterate
let next = inventory.watch(options: ChangeStreamOptions(fullDocument: .updateLookup))
    .flatMap { changeStream in
        changeStream.next()
    }
// Option 2: register a callback to execute for each document
let result = inventory.watch(options: ChangeStreamOptions(fullDocument: .updateLookup))
    .flatMap { changeStream in
        changeStream.forEach { event in
            // process event
            print(event)
        }
    }

let inventory = db.collection("inventory")
let changeStream = try inventory.watch(options: ChangeStreamOptions(fullDocument: .updateLookup))
let next = changeStream.next()