C++ syntax I am not familiar with

Question

I see some C++ syntax I am not familiar with:

fftfilt *mark_filt;

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.

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mark_filt = new fftfilt( ... ); // I left out arguments for the constructor.

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.

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mark_filt = (fftfilt *)0;

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I do not understand what (fftfilt *)0 means or does?
Perhaps someone who uses c++ all the time can explain this to me?

Thanks,
Howard

Answer 1

It's an old way to represent NULL, which is generally just a macro defined to be 0. You should instead prefer

mark_filt = nullptr;

although I hope before then since there was a new someone called delete mark_filt

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