DynBindModelExamples: Difference between revisions
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====Calculate <math>\delta_{S_2}\left( C_2 \mapsto C_2 \right)</math>==== | ====Calculate <math>\delta_{S_2}\left( C_2 \mapsto C_2 \right)</math>==== | ||
According to the [[DynBindModel#The_dynamic_binding_function|definition]]: | According to the [[DynBindModel#The_dynamic_binding_function|definition]]: | ||
<math> | <math> | ||
\delta_{S_2}\left( C_2 \mapsto C_2 \right) | \delta_{S_2}\left( C_2 \mapsto C_2 \right) | ||
= | = | ||
\beta_S \left( C_2 \mapsto C_2 \right) ; | |||
\left( | |||
\left( \mbox {UNION} \, b \cdot \left( | |||
b \in \alpha_2 | |||
\, |\, | \, |\, | ||
\left( \beta_S \left( b \mapsto b \right) ; \eta_{2,b} \right)^{-1} | |||
; | |||
\delta_{S_1}\left( b \mapsto b \right)\right) \right) \ll \tau_2 | |||
\right) | |||
</math> | </math> | ||
#<math> | #<math> | ||
\mbox {UNION} \, b \cdot \left(b \in \left\{ C_1 \right\} | |||
\, |\, | \, |\, | ||
\left( \beta_S \left( b \mapsto b \right) ; \eta_{2,b} \right)^{-1} | |||
; | |||
\delta_{S_1}\left( b \mapsto b \right)\right) | |||
= | = | ||
\left( \beta_S \left( C_1 \mapsto C_1 \right) ; \eta_{2,C_1} \right)^{-1} | |||
; | |||
\delta_{S_1}\left( C_1 \mapsto C_1 \right) | |||
</math> | </math> | ||
##<math> | ##<math> | ||
\ | \beta_S \left( C_1 \mapsto C_1 \right) ; \eta_{2,C_1} | ||
= | = | ||
\left\{ | \left\{ f_1 \mapsto f_2, g_1 \mapsto g_2 \right\} | ||
</math> | </math> | ||
##<math> | ##<math> | ||
\ | \left( \beta_S \left( C_1 \mapsto C_1 \right) ; \eta_{2,C_1} \right)^{-1} | ||
= | = | ||
\left\{ \ | \left\{ f_2 \mapsto f_1, g_2 \mapsto g_1 \right\} | ||
</math> | </math> | ||
##<math> | ##<math> | ||
\left( | \left( \beta_S \left( C_1 \mapsto C_1 \right) ; \eta_{2,C_1} \right)^{-1} | ||
; | |||
\delta_{S_1}\left( C_1 \mapsto C_1 \right) | |||
= | = | ||
\left\{ f_2 \mapsto \underline{C_1.f_1}, g_2 \mapsto \underline{C_1.g_1} \right\} | \left\{ f_2 \mapsto \underline{C_1.f_1}, g_2 \mapsto \underline{C_1.g_1} \right\} | ||
Revision as of 18:38, 11 October 2006
Author: Matthias Konrad
The system
In this example we are studying a symple system with three classes that contains both renaming and selects:
class C1 feature f1 do ... end g1 do ... end end |
class C2 inherit B rename f1 as f2, g1 as g2 redefine f2, g2 end feature f2 do ... end g2 do ... end end |
class C3 inherit C2 select f2 end C1 redefine f1, g1 select g1 end feature f1 do ... end g1 do ... end end |
This system is defined by:
The naming function
We proceed by calculating the naming function. According to its definition we have to do that incrementaly. Meaning that we first calculate then and finally .
Calculating
Since contains only one class it is sufficient to define . According to the definition:
We can forget about the right part of the union since has no base classes. So we need to calculate:
So we get:
And hence:
Calculating
We show the calculation of the different (four) parts of the function in separate sections:
Calculate
According to the definition:
Calculate
According to the definition:
Calculate
According to the definition:
Lets calculate the left part first:
And now the right part:
So we get:
Calculate
According to the definition:
Where:
And:
Here are the steps taken to compute the part:
So we get:
Putting the parts together:
We can know show the complete total function:
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Calculating
We will not show the complete construction of but restrict our self to the most interesting parts.
Calculate
According to the definition:
Where:
And:
Note that we can ommit from the formulas since it is always empty.
So we get:
The complete naming function
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The dynamic binding function
To calculate the dynamic binding function, we need to get . We will again calculate it incrementaly:
Calculating
According to the definition:
Since is empty this simplifies to:
So we get:
Calculating
Again we calculate the different parts of the function in separate sections:
Calculate
According to the definition:
Calculate
According to the definition:
Calculate
According to the definition:
So we get:
Calculate
According to the definition:
At this stage it should be clear how to calculate this, so we just give the result:
Putting the parts together:
We can know show the complete total function:
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Calculating
There is nothing new for this calculation so we just present the result:
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Deriving the dynamic binding function
The function is now given. We evaluate it at two interesting points: