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An implementation of object-oriented classes in MiniZinc
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| % define a Rectangle "class" | |
| var int: Rectangle(var int: width, var int: height) = | |
| let { | |
| var int: this; | |
| constraint Type(this) = Rectangle; %define the "type" of the instance | |
| %define some "instance methods" | |
| constraint area(this) = width*height; | |
| constraint perimeter(this) = (width+height)*2; | |
| constraint width(this) = width; | |
| constraint height(this) = height; | |
| } in this; | |
| %this enum should contain the list of class names | |
| enum Type = {Rectangle}; | |
| function var Type: Type(var int:a); | |
| %declare the "instance methods" | |
| function var int: area(var int:this) = let {var int:result;} in result; | |
| function var int: height(var int:a) = let {var int:result;} in result; | |
| function var int: width(var int:a) = let {var int:result;} in result; | |
| function var int: perimeter(var int:a) = let {var int:result;} in result; | |
| %create an instance of the "class" | |
| var int: rect = Rectangle(3,4); | |
| var int: area1 = area(rect); | |
| solve satisfy; | |
| % print the area of the rectangle | |
| output [show(area1),"\n"]; |
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