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doubts about bin_at

From: Bin Chen <binary dot chen at gmail dot com>
To: libc-alpha at sourceware dot org
Date: Thu, 25 Jan 2007 21:10:13 +0800
Subject: doubts about bin_at

Hi,

In malloc.c defines bin_at macro, but I don't know why this way bin_at can find the bin address,

#define bin_at(m, i) ((mbinptr)((char*)&((m)->bins[(i)<<1]) - (SIZE_SZ<<1)))

Anyone help to explain this?

Thanks a lot.
Bin Chen

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