Loading a Functor class via Composer

composer.json

{
    "name": "leandro/composer-functor",
    "description": "test para probar la carga de un functor mediante Composer",
    "type": "project",
    "license": "BSD",
    "authors": [
        {
            "name": "leandro",
            "email": "[email protected]"
        }
    ],
    "autoload": {
        "psr-4": {
            "Acme\\": "src/"
        }
    }
}

index.php

<?php

require 'vendor/autoload.php';

$saludo = new Acme\Leandro\Saludo;
$saludo("Mariano");

Saludo.php

<?php

namespace Acme\Leandro;

class Saludo {
  public function __invoke($name){
    echo "Hola $name !!";
  }
}