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howto compare references
https://www.singular.uni-kl.de/forum/viewtopic.php?f=10&t=2286		 Page 1 of 1
Author:  Jack [ Thu Sep 26, 2013 6:57 pm ]
Post subject:  howto compare references
Hello,

is there a method to check if
two Singular references belongs to the same name/object?


Jack

example:
Code:

system("reference");
ring rng =0,(x),dp;

reference ref1 = rng;
reference ref2 = rng;

// how to check if ref1 and ref2 a tied to same name/object?
Author:  malex [ Thu Jun 12, 2014 12:38 am ]
Post subject:  Re: howto compare references
how about the "same" method?

Code:
> system(ref1, "help");
system(<ref>, ...): extended functionality for reference/shared data <ref>
  system(<ref>, count)         - number of references pointing to <ref>
  system(<ref>, enumerate)     - unique number for identifying <ref>
  system(<ref>, undefined)     - checks whether <ref> had been assigned
  system(<ref>, "help")        - prints this information message
  system(<ref>, "typeof")      - actual type referenced by <ref>
  system(<ref1>, same, <ref2>) - tests for identic reference objects
> system(ref1, "same", ref2);
0
>reference ref3 = ref1;
> system(ref1, "same", ref3);
1
Author:  jack [ Thu Jun 12, 2014 3:20 pm ]
Post subject:  Re: howto compare references
malex wrote:
how about the "same" method?

ok, same checks if the reference objects are identic,
but then how to test if two references ref1 and ref2 are tied to the >same object<?
Code:
system("reference");
ring rng =0,(x),dp;

reference ref1 = rng;
reference ref2 = rng;
system(ref1,"same",ref2); //0
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