From: "Kent S." <happy@...>
Date: 2004-03-12T04:49:38+09:00
Subject: Re: A few questions about Ruby/DL

Josh Huber wrote:

 >
 > Okay, but it looks like by default PtrData#free is nil, right?  Do I
 > always have to specify a freeing function?
 >
 > It seems as though the result of DL::malloc also does not have the
 > #free attribute set by default.

Yes, you're right. I should have used DL.malloc instead of 
PtrData.malloc. DL.malloc sets free function by default:

$ irb
irb(main):001:0> require 'dl/import'
=> true
irb(main):002:0> ptr = DL.malloc(DL.sizeof('I'))
=> #<DL::PtrData:0x0x44d2e0 ptr=0x0x484ba0 size=4 free=0x0x5876ec>
irb(main):003:0> ptr.free
=> #<DL::Symbol:0x0x4551f0 func=0x0x5876ec 'void (free)(void *);'>
irb(main):004:0>


 >
 >
 > Thanks for this example, it's a little more clear now.  Wouldn't you
 > want to set len.free to DL::FREE as well?
 >

I should have used len = DL.malloc(DL.malloc('I')) instead.

/kent