APM Entities(Implementation)

Class pwb {

Private:

// Attributes

ListOfxy_coordinates *outline;

ListOfpwb_layer *layup;

double width , length , total_diagonal ,

total_thickness , coefficient_of_thermal_bending;

Public:

// Attribute access functions

ListOfxy_coordinates *outline( void )

{ return(outline) };

ListOfpwb_layer *layup( void )

{ return(layup) };

double width( void )

{ return(width) }

(…)

// Attribute update functions

void outline(ListOfxy_coordinates *anOutline )

{ outline = anOutline };

void layup( listOfpwb_layer *aListOfpwb_layer )

{ layup = aListOfpwb_layer };

void width( double aWidth )

{ width = aWidth };

(…)

}; // End of definition of class pwb

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• These EXPRESS definitions are then compiled to generate C++ code, which can be used by analysis applications to access the values of the attributes (regular and idealized) of the entities defined in the APM.

• As shown in this slide, the pwb entity defined in using EXPRESS becomes the C++ class pwb, and the attributes of this entity become member variables of the class.

• The EXPRESS to C++ compilation automatically generates member functions to access and update the values of the attributes.

• In addition to the access and update member functions, each WHERE rule defines one access function for each possible combination of inputs and outputs.

• For example, from wr1 in we could generate a member function that outputs the width given the outline of the board. Likewise, from the same WHERE rule we could generate another member function to perform the opposite operation; calculate the outline of the board given the width (although, in this case, the problem must be somehow constrained in order to be able to reach a unique solution).