34 lines
1.3 KiB
Ruby
34 lines
1.3 KiB
Ruby
# An Object is really a hash like structure. It is dynamic and
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# you want to store values by name.
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# One could (like mri), store the names in each object, but that is wasteful
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# Instead we store only the values, and access them by index.
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# The Layout allows the mapping of names to index.
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# The Layout of an object describes the memory layout of the object
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# The Layout is a simple list of the names of instance variables.
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#
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# As every object has a Layout to describe it, the name "layout" is the
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# first name in the list for every Layout.
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# But as we want every Object to have a class, this is the second
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# entry in the list. The name for the entry is "object_class"
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# In other words, the Layout is a list of names that describe
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# the values stored in an actual object.
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# The object is an array of values of length n and
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# the Layout is an array of names of length n
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# Together they turn the object into a hash like structure
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module Parfait
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class Layout < Object
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# given a name as symbol, return the integer index of that entry
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# we use 0 as "not found" as we don't want negatives, and can't raise
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# luckily 0 is always the type-word in an object and so by returning
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# one-offsets we can use the return value straight without adding 1
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def index_of( name )
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#internal implementation....
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end
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end
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end
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