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update index of elements while calling update_offset()
author Thinker K.F. Li <thinker@codemud.net>
date Tue, 09 Aug 2011 00:06:58 +0800
parents e790c6b2d5d9
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e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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1 Data struct own some relation-ship or logics internally. Usually,
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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2 they are described in code spreaded over the project. The problem of
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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3 code is deattach relationships from the data struct. You don't see
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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4 the relationship with definition of data struct alone. You can also
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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5 not get the relationship from the code easily. So, we need a way
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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6 to describe relationship in the definition of data struct to attach
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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7 the information with data struct.
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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8
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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9 Attaching relationship is not only easy to read, but also parse-able.
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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10 Relationships are attached a part of definition of data struct. They
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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11 are not code, it means more easy to be parsed. A lot of code can be
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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12 generated automatically by tools.
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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13
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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14 Persisted data (in secondary storage) is usually a tree with reference
e790c6b2d5d9 doc for data struct description
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15 between branches while internal data struct is usually a group of
e790c6b2d5d9 doc for data struct description
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16 interconnected objects. We dont use persisted one directly because
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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17 they are more hard to be used. You need extra-logic to travel
e790c6b2d5d9 doc for data struct description
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18 persisted data struct. We need the code to convert persisted data
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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19 struct to internal one and in reversed, but it is tedious. With a
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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20 language to describe data struct with attaching relationship, we can
e790c6b2d5d9 doc for data struct description
Thinker K.F. Li <thinker@codemud.net>
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21 generate code for conversion of data struct from/to persisted to/from
e790c6b2d5d9 doc for data struct description
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22 internal ones.
e790c6b2d5d9 doc for data struct description
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23
e790c6b2d5d9 doc for data struct description
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24 ** Construction
e790c6b2d5d9 doc for data struct description
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25
e790c6b2d5d9 doc for data struct description
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26 - types
e790c6b2d5d9 doc for data struct description
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27 - relationships
e790c6b2d5d9 doc for data struct description
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28 - reference
e790c6b2d5d9 doc for data struct description
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29 - dependency
e790c6b2d5d9 doc for data struct description
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30 - constrain
e790c6b2d5d9 doc for data struct description
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31 - condition
e790c6b2d5d9 doc for data struct description
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32 - path