48 lines
1.1 KiB
Ruby
48 lines
1.1 KiB
Ruby
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# This file contains the Ruby code from book of
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# "Data Structures and Algorithms
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# with Object-Oriented Design Patterns in Ruby"
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# by Bruno R. Preiss.
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#
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# Copyright (c) 2004 by Bruno R. Preiss, P.Eng. All rights reserved.
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class MultiDimensionalArray
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def initialize(*dimensions)
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@dimensions = Array.new(dimensions.length)
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@factors = Array.new(dimensions.length)
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product = 1
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i = dimensions.length - 1
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while i >= 0
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@dimensions[i] = dimensions[i]
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@factors[i] = product
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product *= @dimensions[i]
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i -= 1
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end
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@data = Array.new(product)
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end
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def getOffset(indices)
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raise IndexError if indices.length != @dimensions.length
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offset = 0
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for i in 0 ... @dimensions.length
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if indices[i] < 0 or indices[i] >= @dimensions[i]
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raise IndexError
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end
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offset += @factors[i] * indices[i]
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end
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offset
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end
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def [](*indices)
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@data[self.getOffset(indices)]
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end
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def []=(*indicesAndValue)
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value = indicesAndValue.pop
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@data[self.getOffset(indicesAndValue)] = value
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end
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end
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