/// <summary>
/// Initializes a new instance of the <see cref="EntitySystem" /> class.
/// </summary>
protected EntitySystem()
{
this.Bit = 0;
this.aspect = Aspect.Empty();
this.IsEnabled = true;
}
/// <summary>
/// Initializes a new instance of the <see cref="EntityComponentProcessingSystem{T}"/> class
/// with an aspect which processes entities which have all the specified component types.
/// </summary>
protected EntityComponentProcessingSystem()
: this(Aspect.Empty())
{
}