An option to insert the identity hashCode in ToStringHelper

[GoogleCodeExporter]

Sometimes when debugging from the logs it's useful to distinguish two identical 
but different objects.

I suggest an option for ToStringHelper (as a factory method, or as a 
ToStringHelper option method like omitNulls()) to insert the identity hashCode 
as returned by System.identityHashCode().

This way we can construct the following String:
"ClassName@1f2e3d4c{x=1}"

Currently, I usually do it like this:

  return Objects.toStringHelper(getClass().getSimpleName() + '@' + Integer.toHexString(System.identityHashCode()))
    .add("x", 1)
    .toString();

or something like this:

  return Objects.toStringHelper(this)
    .add("@", System.identityHashCode(this))
    .add("x", 1)
    .toString(); 

Both of which are inelegant and/or underperforming.

Original issue reported on code.google.com by ogregoire on 1 Aug 2013 at 10:40

[GoogleCodeExporter]

Hmm... I don't feel like your current solutions are too bad, and this doesn't 
feel like a very common need to me. A quick search has shown 2 places in our 
codebase using the identity hash code with toStringHelper. Still, I don't have 
a very strong opinion on this.

Original comment by cgdecker@google.com on 2 Aug 2013 at 9:21

• Added labels: Type-Addition
• Removed labels: Type-Enhancement

[GoogleCodeExporter]

This issue has been migrated to GitHub.

It can be found at https://github.com/google/guava/issues/<issue id>

Original comment by cgdecker@google.com on 1 Nov 2014 at 4:12

• Added labels: MigratedToGitHub

[GoogleCodeExporter]

Original comment by cgdecker@google.com on 1 Nov 2014 at 4:17

• Changed state: Migrated

[GoogleCodeExporter]

Original comment by cgdecker@google.com on 3 Nov 2014 at 9:08

• Added labels: Restrict-AddIssueComment-Commit