multiton cache of fields - wraps fields and fieldpos map to save memory
# File lib/arrayfields.rb, line 18 18: def init_sets 19: @sets = {} 20: end
# File lib/arrayfields.rb, line 15 15: def new fields 16: @sets[fields] ||= super 17: end
# File lib/arrayfields.rb, line 27 27: def initialize fields 28: raise ArgumentError, "<#{ fields.inspect }> not inject-able" unless 29: fields.respond_to? :inject 30: 31: @fieldpos = 32: fields.inject({}) do |h, f| 33: unless String === f or Symbol === f 34: raise ArgumentError, "<#{ f.inspect }> neither String nor Symbol" 35: end 36: h[f] = h.size 37: h 38: end 39: 40: @fields = fields 41: end
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