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Mastering Android NDK by Viktor Latypov, Sergey Kosarevsky

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Collective behaviors

By now, we have defined only the clWanderBehaviour class. To implement flocking algorithms, we need to store information about all the boids at once. Such a collection is called a Swarm here. The clSwarm class holds a vector of clBoid objects and implements a number of routines used in boid control calculations:

class clSwarm: public iIntrusiveCounter
{
public:
  std::vector< clPtr<clBoid> > m_Boids;
  clSwarm() {}

For debugging and visual demonstration purposes, the GenerateRandom() method allocates a number of clBoid objects with random positions and zero velocities:

  void GenerateRandom( size_t N )
  {
    m_Boids.reserve( N );
    for ( size_t i = 0; i != N; i++ )
    {
      m_Boids.emplace_back( make_intrusive<clBoid>() );

By default, each boid ...

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