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C++ : Polymorphic inheritance without vtable

Inheritance and Virtual Table are often used to create interface in C++ polymorphic class
What if ... there were another way to do this ?
easier, cleaner, faster and more reliable
This article explains how to use CRTP, [std::variant](https://en.cppreference.com/w/cpp/utility/variant and std::visit to increase code performance.

Table of content

Introduction

C++ : Polymorphic inheritance without vtable

In this article, we will see how to use CRTP, std::variant and std::visit to increase our code performances.

Meteor Alternatives Per Feature

This table was created in 2015 so may be quite outdated today.

Feature	Meteor Solution	Alternative Solutions	Description
Live DB Sync	[livequery][lq] ([mongo-oplog]), [ddp]	RethinkDB, Redis, ShareDB, [npm:mongo-oplog], [firebase], etc.	Push DB updates to client/server.
Latency Compensation, Optimistic UI	[minimongo][mm]	[RethinkDB][lcr], [mWater/minimongo] (fork, not ws but http, browserify)	Imitate successful db query on client before it is done.
Isomorphic Code	[isobuild] & isopacks	browserify	Write one code for server/client/mobile.
Isomorphic Packaging	[isobuild], atmosphere		No more separate packages for server & client. Get bower + npm + mobile.

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

	import "package:flutter/widgets.dart";
	import "dart:math";

	class SnappingListView extends StatefulWidget {
	final Axis scrollDirection;
	final ScrollController controller;

	final IndexedWidgetBuilder itemBuilder;
	final List<Widget> children;
	final int itemCount;

	import 'dart:async';
	import 'package:flutter/material.dart';
	import 'paged_listview.dart';

	void main() => runApp(MaterialApp(home: HomeScreen()));

	class HomeScreen extends StatefulWidget {
	@override
	_HomeAppState createState() => _HomeAppState();
	}

	import 'dart:async';

	import 'package:flutter/material.dart';

	void main() => runApp(new MyApp());

	class MyApp extends StatelessWidget {
	@override
	Widget build(BuildContext context) {
	return new MaterialApp(

	#ifndef _UNISTD_H
	#define _UNISTD_H 1

	/* This file intended to serve as a drop-in replacement for
	* unistd.h on Windows.
	* Please add functionality as neeeded.
	* Original file from: http://stackoverflow.com/a/826027
	*/

	#include <stdlib.h>

	package main

	import (
	"crypto/aes"
	"crypto/cipher"
	"fmt"
	)

	func EncryptAESCFB(dst, src, key, iv []byte) error {
	aesBlockEncrypter, err := aes.NewCipher([]byte(key))