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< Erlang ~ Splitting binary stuff |
| wolfgke |
 Posted: Sat Nov 10, 2007 9:35 am |
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User
Joined: 16 Sep 2007
Posts: 16
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Dear people,
the following code did not work:
Code:
<<_:(CurrentSize-32), T:32, _/binary>> = ActExpandedKey,
% ...
The compiler complains with "illegal bit size" in this line.
So I played around: this code seems to work as it has to:
Code:
Foo=(CurrentSize-32),
<<_:Foo, T:32, _/binary>> = ActExpandedKey,
% ...
But I don't know the reason why it is like that. 
Could anybody help me, please? |
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| Kenneth |
| Posted: Sun Nov 11, 2007 8:59 pm |
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Joined: 28 Feb 2005
Posts: 5
Location: Stockholm, Sweden
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[quote="wolfgke"]Dear people,
the following code did not work:
Code:
<<_:(CurrentSize-32), T:32, _/binary>> = ActExpandedKey,
% ...
The compiler complains with "illegal bit size" in this line.
It is a documented limitation of the bit-syntax that the size must be an integer literal or a variable bound to an integer value.
In your second example you use a variable bound to
an integer value which is ok.
See
http://www.erlang.org/doc/reference_manual/expressions.html#6.16
/Kenneth (Erlang/OTP team at Ericsson) |
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| wolfgke |
| Posted: Tue Nov 20, 2007 1:08 pm |
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User
Joined: 16 Sep 2007
Posts: 16
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A belated Thank-you for your explanation.  |
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