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author | Sean Griffin <sean@seantheprogrammer.com> | 2016-09-26 10:27:11 -0400 |
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committer | Sean Griffin <sean@seantheprogrammer.com> | 2016-09-26 10:27:11 -0400 |
commit | a6da7938017647dd6e19e23d3d47126cb7a3e1fe (patch) | |
tree | e46c6fd36d800143321b486565ebba79a3bb1f5a /version.rb | |
parent | 15a8740d68ccf1f376b5f2cf29c5336d8716278f (diff) | |
download | rails-a6da7938017647dd6e19e23d3d47126cb7a3e1fe.tar.gz rails-a6da7938017647dd6e19e23d3d47126cb7a3e1fe.tar.bz2 rails-a6da7938017647dd6e19e23d3d47126cb7a3e1fe.zip |
Use xor to avoid allocations in `AR::Core#hash`
This is not as good a solution as actually hashing both values, but Ruby
doesn't expose that capability other than allocating the array. Unless we were
to do something silly like have a thread local array that is re-used, I don't
see any other way to do this without allocation. This solution may not be
perfect, but it should reasonably avoid collisions to the extent that we need.
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