size of an IO list

Bjorn Gustavsson bjorn@REDACTED
Mon Mar 7 11:20:18 CET 2005

As usual, the hardest part is usually coming up with a good name.
After some discussion, Kenneth and I come up with the following
suggestion for TWO new BIFs.


where iolist_to_binary/1 will work like this

iolist_to_binary(IOList) ->

but be much faster (and obviously not build the temporary binary).

The reason for the new iolist_to_binary/1 BIF is that is not clear
that iolist_size/1 is any way releated to list_to_binary/1.

Comments? Other name suggestions?


"Joe Armstrong \(AL/EAB\)" <joe.armstrong@REDACTED> writes:

>  How about a BIF to compute the size of an I/O list?
>  Why?
>  I have made a deep list that I want to output (guess what's it's HTML :-)
>  I need to make an HTTP header element  "Content-Length: ..."
>  Which is the size of the flattened deep list , but I don't want to flatten it (horrors)
>  or traverse it (in Erlang) to find the length.
>  Suitable case for a BIF?
>   /Joe

Björn Gustavsson, Erlang/OTP, Ericsson AB

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