C++ - Return a future from functions

[Bambofy]

Using the functions that run on another thread e.g. client->authenticateDevice() don't return any way to control their execution, please can you return a future from these functions so i can await them?

Here's an example of a workaround i'm using at the moment:

//
// MIT LICENSE
//
// Copyright (c) 2020 R.G.Bamford
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

#pragma once

#include <nakama-cpp/Nakama.h>

#include <thread>
#include <iostream>

using namespace std;
using namespace Nakama;

class TestServer {
public:
	bool Connect() {
		cout << "Testing the connection to the test server." << endl;

		NHttpTransportPtr transport = createDefaultHttpTransport();
		transport->setBaseUri("http://www.google.com");

		NHttpRequest request;
		request.path = "/";
		request.method = NHttpReqMethod::GET;

		bool waiting = true;
		int statusCode;
		transport->request(request,
			[&statusCode, &waiting](const NHttpResponsePtr& response) {
				statusCode = response->statusCode;
				waiting = false;
			});

		while (waiting) {
			this_thread::sleep_for(chrono::milliseconds(8));
			transport->tick();
		}

		cout << "Finished! Status code: " << statusCode << endl;

		return (statusCode == 200);
	}
};

Thanks!