EXERCISE 4
Alexis Uribe
Carlo Peruzzo

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Exercise 1.2:
The overloaded method createSimulation (three arguments) is taking as an input the function called "createComputes" that has been defined in the file main.py.
This function is specific for the type of particle that the user has chosen, it sets some physical parameters and initializes
some methods for the simulation.
The function createComputes is stored by createSimulation in a object of type std::function<void(Real)> defined in the header <functional>
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Instances of std::function can store, copy, and invoke any Callable target -- functions, lambda expressions,
bind expressions, or other function objects, as well as pointers to member functions and pointers to data members.
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Coming back to the method createSimulation, after storing "createCompute", it executes
the method createSimulation (non overloaded, two arguments) that is specific of the daughter class related with the selected type of particle and
it calls the createComputes stored in the object of type std::function<void(Real)>.
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