m_particles = NULL;
// create array of m_numparticles. 'this'is a pointer to the parentsystem.
// CParticle(CParticleSystem *a_system) is a constructor of CParticle.
m_particles = new CParticle(this) [m_numparticles];
trouble with new keyword
Author
Hi. I'm currently implementing a very basic particle system.
Particles are represented by the CParticle class.
Particles belong to a CParticleSystem and are stored in a single pool, so no creating/destroying particles is needed while the system is running.
When a particlesystem is created it will create int m_numparticles of particles.
The particles are stored in a plain array as I wont need to resize it constantly. I've tried creating the array like this:
m_particles = new CParticle[m_numparticles]; for(int i = 0; i < m_numparticles; i++){ m_particles = new CParticle(this);}later edit: assuming CParticle** m_particles [wink]
You can't pass arguments to the constructor of elements of an array being created dynamically. Consider using std::vector which will allow you to specify an object to copy construct the elements from.
To be a little more explicit:
std::vector<CParticle> m_particles(m_numparticles, CParticle(this));// the temporary, stack-allocated CParticle is copy-constructed to each// element of the vector. The vector "knows" its size, so m_numparticles// will become redundant. You will of course need a proper copy constructor// and destructor (and therefore assignment operator) for the CParticle -// depending on what exactly is in there, the defaults may be ok.
Author
I guess I'll use werekarg's approach, as I don't want to use a vector for an array that will only change it's size once. Thanks all of you though.
That's a weak argument. Using a vector is just as efficient as using an array created with new. Sure, it contains a few extra bytes used for it's internal book keeping, but you dragging around that m_numparticles variable isn't a whole lot better.
This topic is closed to new replies.
Advertisement
Popular Topics
Advertisement
