Splat operator gives an SystemStackError

ruby-talk
1

Hello,
when I'm running this programm

a1 = (1..150000).to_a

def splat_test(*args)
   puts args.size
end

splat_test(*a1)

I get a SystemStackError exception.

My setup:
Arch Linux
rvm ruby 1.9.2-p0 (also tried with 1.9.2-p180)

Can anyone reproduce this behavior or is this a problem with my ruby install?

PS: I hope this is the right place to ask this question, if not I'm sorry.

Greetings
Gunther

2

You are trying to pass in 150,000 arguments to a method. Surprisingly, this did work for me on 1.8.7-p302. However, 1.9 has very different internals. This is a complete guess, but it may be trying to push all of those arguments onto the stack, giving the resulting error.

-Justin

···

On 03/04/2011 03:40 AM, Gunther Diemant wrote:

Hello,
when I'm running this programm

a1 = (1..150000).to_a

def splat_test(*args)
  puts args.size
end

splat_test(*a1)

I get a SystemStackError exception.

My setup:
Arch Linux
rvm ruby 1.9.2-p0 (also tried with 1.9.2-p180)

Can anyone reproduce this behavior or is this a problem with my ruby install?

PS: I hope this is the right place to ask this question, if not I'm sorry.

Greetings
Gunther

3

So, you think there is a limit to the number of method arguments (at least in 1.9)?
I came across this problem, when I tried some different approaches to convert an array to a hash (inspired by http://exposinggotchas.blogspot.com/2011/03/fun-with-ruby-arrays-hashes-and.html\).
At least, the splat isn't necessary in this case.

-Gunther

···

Am 04.03.2011 12:48, schrieb Justin Collins:

You are trying to pass in 150,000 arguments to a method. Surprisingly, this did work for me on 1.8.7-p302. However, 1.9 has very different internals. This is a complete guess, but it may be trying to push all of those arguments onto the stack, giving the resulting error.

-Justin