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Bug? Hash and System Variable [message #84351]

Thu, 30 May 2013 21:08

SonicKenking
Messages: 51
Registered: October 2010

Member

The following simple code errors out

defsysv, '!SOME_SYS_VAR', hash()
help, !SOME_SYS_VAR
(!SOME_SYS_VAR)['A'] = 1
end

The output is as follows
<Expression> HASH <ID=1 NELEMENTS=0>
% Expression must be an array in this context: !SOME_SYS_VAR.

The funny thing is that I can actually run the same command by typing it on the IDL prompt. So following command runs:

IDL> (!SOME_SYS_VAR)['A'] = 1
IDL> print, !SOME_SYS_VAR
A: 1

Is it a bug or feature? And how can I correct the code so it can run inside a routine instead of on the prompt (@ is the same as typing on the prompt).

Thanks!

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Re: Bug? Hash and System Variable [message #84424 is a reply to message #84351]

Sun, 02 June 2013 18:31

SonicKenking
Messages: 51
Registered: October 2010

Member

Thanks for the responses. So it is most likely a Bug.

I did find a workaround in case anyone is interested. A hash variable is essentially a pointer. Also the bug seems only affect system variable. So following workaround works.

defsysv, '!SOME_SYS_VAR', hash()
a_normal_var = !SOME_SYS_VAR
a_normal_var['A'] = 1
print, !SOME_SYS_VAR
end

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