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Bad Argument, (Bug or something I'm missing).
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Chris Cook  
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 More options Oct 1 2012, 4:11 am
From: Chris Cook <cookchr...@gmail.com>
Date: Mon, 1 Oct 2012 09:11:45 +0100
Local: Mon, Oct 1 2012 4:11 am
Subject: [erlang-questions] Bad Argument, (Bug or something I'm missing).
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Morning list,

I have,

Erlang R15B01 (erts-5.9.1) [source] [async-threads:0] [hipe] [kernel-poll:false]

Eshell V5.9.1  (abort with ^G)
1> List = "89234789234jhk2hk234892789fauky324978".
"89234789234jhk2hk234892789fauky324978"
2> <<List, <<"-">>/binary>>.
** exception error: bad argument

But when I write it as this,

3> <<"89234789234jhk2hk234892789fauky324978", <<"-">>/binary>>.
<<"89234789234jhk2hk234892789fauky324978-">>

I get the result I expected to get from the above 1 & 2. Could someone
please explain what is going wrong and why, because I'm very confused
with it.

Regards

Chris Cook.
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Lukas Larsson  
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 More options Oct 1 2012, 4:44 am
From: Lukas Larsson <lu...@erlang-solutions.com>
Date: Mon, 1 Oct 2012 10:43:53 +0200
Local: Mon, Oct 1 2012 4:43 am
Subject: Re: [erlang-questions] Bad Argument, (Bug or something I'm missing).
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Hi,

If you just do

2> L = "a",<<L>>.
** exception error: bad argument

You get the same behaviour. When you do <<"a">> it is just syntactic
sugar for << <<97>>/binary >>. However when passing the value as a
variable you do not get the syntactic sugar help so you have to do
this:

3> L = "a",<<(list_to_binary(L))/binary>>.
<<"a">>

or something to that effect to get the correct result. Hope that makes sense.

Lukas

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Jesse Gumm  
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 More options Oct 1 2012, 4:46 am
From: Jesse Gumm <g...@sigma-star.com>
Date: Mon, 1 Oct 2012 03:46:51 -0500
Local: Mon, Oct 1 2012 4:46 am
Subject: Re: [erlang-questions] Bad Argument, (Bug or something I'm missing).
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Hi,

You just need to convert List to a binary first with list_to_binary.

The <<"something">> syntax is just a friendly way to make binary literals.
But it does not perform automatic casting of lists.

Further, the extra << >> you're wrapping around "-" is unnecessary.

Example:

> L = "123456",
> B = list_to_binary(L),
> <<B/binary,"-">>.

Will yield:

<<"123456-">>

Hope that helps.

Take it easy,

-Jesse

--
Jesse Gumm
Owner, Sigma Star Systems
414.940.4866 || sigma-star.com || @jessegumm
On Oct 1, 2012 3:11 AM, "Chris Cook" <cookchr...@gmail.com> wrote:

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Junior White  
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 More options Oct 11 2012, 12:20 am
From: Junior White <efi...@gmail.com>
Date: Thu, 11 Oct 2012 12:20:28 +0800
Local: Thurs, Oct 11 2012 12:20 am
Subject: Re: [erlang-questions] Bad Argument, (Bug or something I'm missing).
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hi,
   This behave makes me confused too.

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Joe Armstrong  
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 More options Oct 11 2012, 1:54 pm
From: Joe Armstrong <erl...@gmail.com>
Date: Thu, 11 Oct 2012 19:54:07 +0200
Local: Thurs, Oct 11 2012 1:54 pm
Subject: Re: [erlang-questions] Bad Argument, (Bug or something I'm missing).
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1> L = "hello".
"hello"
2> << L, " world" >>.
** exception error: bad argument
3>
3> B = <<"hello">>.
<<"hello">>
4> << B, " world" >>.
** exception error: bad argument

5> << B/binary, " world" >>.
<<"hello world">>

<< X1 X2 ... >>   constructs a binary. The X's can be literal strings
"....." or Var/Descriptor.

Its described in section 7.16 of the erlang reference manual

 http://www.erlang.org/doc/reference_manual/expressions.html#id77949

Cheers

/Joe

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