FastOpenStruct is a reimplementation of Ruby's OpenStruct that avoids invalidating MRI's method caches on every instantiation.
It should be a drop in replacement for OpenStruct.
FastOpenStruct is very fast when your OpenStructs tend to have static sets of attributes:
λ ruby -I./lib bench/attribute_lookup.rb
user system total real
OpenStruct 0.730000 0.000000 0.730000 ( 0.732052)
FastOpenStruct 0.220000 0.000000 0.220000 ( 0.224770)
λ ruby -I./lib bench/attribute_assignment.rb
Attribute assignment:
user system total real
OpenStruct 1.200000 0.000000 1.200000 ( 1.196867)
FastOpenStruct 0.210000 0.000000 0.210000 ( 0.210626)
λ ruby -I./lib bench/10_000_instantiations.rb
user system total real
OpenStruct 0.630000 0.010000 0.640000 ( 0.645598)
FastOpenStruct 0.240000 0.000000 0.240000 ( 0.239307)
However, if you're using dynamically set attributes heavily, it's significantly slower:
λ ruby -I./lib bench/dynamic_attribute_lookup.rb
Dynamic attribute lookup:
user system total real
OpenStruct 0.660000 0.000000 0.660000 ( 0.661448)
FastOpenStruct 2.170000 0.010000 2.180000 ( 2.174698)
λ ruby -I./lib bench/dynamic_attribute_assignment.rb
Dynamic attribute assignment:
user system total real
OpenStruct 1.190000 0.000000 1.190000 ( 1.198603)
FastOpenStruct 6.020000 0.010000 6.030000 ( 6.015700)
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