Object class - Revision history

JAL at 21:14, 6 August 2014

2014-08-06T21:14:57Z

← Older revision		Revision as of 21:14, 6 August 2014
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	<!-- Object class -->		<!-- Object class -->
	The Object class is an implicit base class for '''all''' classes. However, until <var class="product">[[Sirius Mods]]</var> 8.1, there was no way to reference the Object base class via object variables of any of its extension classes (that is all classes other than the Object class) and there was no way to assign an variable of one class to a variable of its base Object class. This is all possible in <var class="product">[[Sirius Mods]]</var> 8.1.		The <var>Object</var> class is an implicit base class for '''all''' classes. However, until <var class="product">[[Sirius Mods]]</var> 8.1, there was no way to reference the <var>Object</var> base class via object variables of any of its extension classes (that is all classes other than the <var>Object</var> class) and there was no way to assign an variable of one class to a variable of its base <var>Object<var> class. This is all possible in <var class="product">Sirius Mods</var> 8.1.

	==Invoking Object class methods with non-Object class variables==		==Invoking Object class methods with non-Object class variables==
	In <var class="product">[[Sirius Mods]]</var> 8.1, it is possible to invoke an Object class method against any object. For example:<p class="code">b		In <var class="product">Sirius Mods</var> 8.1, it is possible to invoke an <var>Object</var> class method against any object. For example:<p class="code">b
	%foo is object stringlist		%foo is object stringlist
	%foo = new		%foo = new
	printText {~=%foo:className}		printText {~=%foo:[[ClassName (Object function)\|className]]}
	end		end
	</p>		</p>
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	would display:<p class="output">%pair:className=Pair		would display:<p class="output">%pair:className=Pair
	</p>		</p>
	These examples illustrate that not only is the <var>Object</var> class an implicit base class of every class (in fact it is not permissible to explicitly declare the <var>Object</var> class as a base class) but ~~that~~ every extension class of the <var>Object</var> class inherits the <var>Object</var> class member names ~~so that~~ the <var>Object</var> class does not have to be specified on an <var>Object</var> class member reference.		These examples illustrate that not only is the <var>Object</var> class an implicit base class of every class (in fact it is not permissible to explicitly declare the <var>Object</var> class as a base class), but every extension class of the <var>Object</var> class inherits the <var>Object</var> class member names. So the <var>Object</var> class does not have to be specified on an <var>Object</var> class member reference.

	However, as with other extension classes, all classes can "hide" a base class member by containing a member with the same name. For example, if the member <var>ClassName</var> is added to class <code>Pair</code> in the above example, <code>%pair:className</code> would refer to the <code>Pair</code> class <code>className</code> method. However, in such a case, it would be possible to reference the <var>Object</var> class <var>ClassName</var> by preceding it with <code>(object)</code> as in:<p class="code">b		However, as with other extension classes, all classes can "hide" a base class member by containing a member with the same name. For example, if the member <var>ClassName</var> is added to class <code>Pair</code> in the above example, <code>%pair:className</code> would refer to the <code>Pair</code> class <code>className</code> method. However, in such a case, it would be possible to reference the <var>Object</var> class <var>ClassName</var> by preceding it with <code>(object)</code> as in:<p class="code">b
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	==Generic Print, Audit, and Trace methods==		==Generic Print, Audit, and Trace methods==
	<var class="product">Sirius Mods</var> 8.0 introduced generic Print, Audit, and Trace methods that could be applied to all User Language objects. So, to a large degree, these were essentially base <var>Object</var> class methods that could be invoked via User Language object variables. However, they did not behave like true <var>Object</var> class methods because they were not available to system classes and because one could not explicitly specify the ~~methods~~ class via <code>(object)</code> before the <var>Print</var>, <var>Audit</var>, or <var>Trace</var> method name. This meant that if a class had one or more of these methods already defined, there was no way to get at the <var>Object</var> class (generic) methods of the same name. These issues are all corrected in <var class="product">Sirius Mods</var> 8.1 so ~~that~~ the <var>Print</var>, <var>Audit</var>, and <var>Trace</var>methods are full-fledged members of the <var>Object</var> class.		<var class="product">Sirius Mods</var> 8.0 introduced generic <var>Print</var>, <var>Audit</var>, and <var>Trace</var> methods that could be applied to all User Language objects. So, to a large degree, these were essentially base <var>Object</var> class methods that could be invoked via User Language object variables. However, they did not behave like true <var>Object</var> class methods, because they were not available to system classes, and because one could not explicitly specify the method's class via <code>(object)</code> before the <var>Print</var>, <var>Audit</var>, or <var>Trace</var> method name. This meant that if a class had one or more of these methods already defined, there was no way to get at the <var>Object</var> class (generic) methods of the same name. These issues are all corrected in <var class="product">Sirius Mods</var> 8.1, so the <var>Print</var>, <var>Audit</var>, and <var>Trace</var>methods are full-fledged members of the <var>Object</var> class.

	==Widening and narrowing assignment==		==Widening and narrowing assignment==
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	==Heterogenous collections==		==Heterogenous collections==
	~~A capability enabled by the~~ improved <var>Object</var> support in <var class="product">Sirius Mods</var> 8.1 is the ability to create collections with items from many different classes. Of course, this is because the collection would be defined as a collection of <var>Object</var> objects and all objects have the <var>Object</var> class as a base class.		The improved <var>Object</var> support in <var class="product">Sirius Mods</var> 8.1 provides the ability to create collections with items from many different classes. Of course, this is because the collection would be defined as a collection of <var>Object</var> objects, and all objects have the <var>Object</var> class as a base class.

	The following illustrates a collection that contains objects of two user classes (<code>Frick</code> and <code>Frack</code>), and two system classes (<var>Stringlist</var> and <var>XmlDoc</var>):<p class="code">...		The following illustrates a collection that contains objects of two user classes (<code>Frick</code> and <code>Frack</code>), and two system classes (<var>Stringlist</var> and <var>XmlDoc</var>):<p class="code">...

JAL: minor cleanup

2014-08-06T18:42:53Z

minor cleanup

Show changes

JAL: /* Invoking Object class methods with non-Object class variables */

2014-07-08T15:22:40Z

Invoking Object class methods with non-Object class variables

← Older revision		Revision as of 15:22, 8 July 2014
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	==Invoking Object class methods with non-Object class variables==		==Invoking Object class methods with non-Object class variables==
	In <var class="product">[[Sirius Mods]]</var> 8.1, it is possible to invoke an Object class method against any object. For example:<p class="code">b		In <var class="product">[[Sirius Mods]]</var> 8.1, it is possible to invoke an Object class method against any object. For example:<p class="code">b

	%foo is object stringlist		%foo is object stringlist

	%foo = new		%foo = new
	printText {~=%foo:className}		printText {~=%foo:className}

	end		end
	</p>		</p>

	would display:<p class="~~code~~">%foo:className=System:Stringlist		would display:<p class="output">%foo:className=System:Stringlist
	</p>		</p>

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	</p>		</p>

	would display:<p class="~~code~~">%pair:className=Pair		would display:<p class="output">%pair:className=Pair
	</p>		</p>
	These examples illustrate that not only is the Object class an implicit base class of every class (in fact it is not permissible to explicitly declare the Object class as a base class) but that every extension class of the Object class inherits the Object class member names so that the Object class does not have to be specified on an Object class member reference. However, as with other extension classes, all classes can "hide" a base class member by containing a member with the same name. For example, if we add the member <var>ClassName</var> to class <var>Pair</var> in the above example, <code>%pair:className</code> would refer to the Pair class <var>className</var>. However, in such a case, it would be possible to reference the Object class <var>className</var> by preceding it with <code>(object)</code> as in:<p class="code">b		These examples illustrate that not only is the Object class an implicit base class of every class (in fact it is not permissible to explicitly declare the Object class as a base class) but that every extension class of the Object class inherits the Object class member names so that the Object class does not have to be specified on an Object class member reference. However, as with other extension classes, all classes can "hide" a base class member by containing a member with the same name. For example, if we add the member <var>ClassName</var> to class <var>Pair</var> in the above example, <code>%pair:className</code> would refer to the Pair class <var>className</var>. However, in such a case, it would be possible to reference the Object class <var>className</var> by preceding it with <code>(object)</code> as in:<p class="code">b
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	end		end
	</p>		</p>
	which displays:<p class="~~code~~">%pair:className=This name makes no sense		which displays:<p class="output">%pair:className=This name makes no sense
	%pair:(object)className=Pair		%pair:(object)className=Pair
	</p>		</p>

	==Generic Print, Audit, and Trace Methods==		==Generic Print, Audit, and Trace Methods==
	<var class="product">[[Sirius Mods]]</var> 8.0 introduced generic Print, Audit, and Trace methods that could be applied to all User Language objects. So, to a large degree, these were essentially base Object class methods that could be invoked via User Language object variables. However, they did not behave like true Object class methods because they were not available to system classes and because one could not explicitly specify the methods class via <code>(object)</code> before the <var>Print</var>, <var>Audit</var>, or <var>Trace</var> method name. This meant that if a class had one or more of these methods already defined, there was no way to get at the Object class (generic) methods of the same name. These issues are all corrected in <var class="product">[[Sirius Mods]]</var> 8.1 so that the <var>Print</var>, <var>Audit</var>, and <var>Trace</var>methods are full-fledged members of the <var>Object</var> class.		<var class="product">[[Sirius Mods]]</var> 8.0 introduced generic Print, Audit, and Trace methods that could be applied to all User Language objects. So, to a large degree, these were essentially base Object class methods that could be invoked via User Language object variables. However, they did not behave like true Object class methods because they were not available to system classes and because one could not explicitly specify the methods class via <code>(object)</code> before the <var>Print</var>, <var>Audit</var>, or <var>Trace</var> method name. This meant that if a class had one or more of these methods already defined, there was no way to get at the Object class (generic) methods of the same name. These issues are all corrected in <var class="product">[[Sirius Mods]]</var> 8.1 so that the <var>Print</var>, <var>Audit</var>, and <var>Trace</var>methods are full-fledged members of the <var>Object</var> class.

Alex: /* Heterogenous collections */

2012-07-16T04:32:07Z

Heterogenous collections

@@ Line 111: / Line 111: @@
 ==Heterogenous collections==
-One new capability enabled by the improved <var>Object</var> support
+One new capability enabled by the improved <var>Object</var> support in <var class="product">Sirius Mods</var> 8.1 is the ability to create collections with items from many different classes. Of course, this is because the collection would be defined as a collection of <var>Object</var> objects and all objects have the <var>Object</var> class as a base class.
 ==List of Object methods==
 The [[List of Object methods|"List of Object methods"]] shows all the class methods, with a brief description of each.
 [[Category:System classes]]

Alex at 04:13, 16 July 2012

2012-07-16T04:13:44Z

← Older revision		Revision as of 04:13, 16 July 2012
Line 1:		Line 1:
	<!-- Object class -->		<!-- Object class -->
	The Object class is an implicit base class for '''all''' classes. However, until <var class="product">[[Sirius Mods]]</var> 8.1, there was no way to reference the Object base class via object variables of any of its extension classes (that is all classes other than the Object class) and there was no way to assign an variable of one class to a variable of its base Object class. This is all possible in <var class="product">[[Sirius Mods]]</var> 8.1.		The Object class is an implicit base class for '''all''' classes. However, until <var class="product">[[Sirius Mods]]</var> 8.1, there was no way to reference the Object base class via object variables of any of its extension classes (that is all classes other than the Object class) and there was no way to assign an variable of one class to a variable of its base Object class. This is all possible in <var class="product">[[Sirius Mods]]</var> 8.1.
			==Invoking Object class methods with non-Object class variables==
	In <var class="product">[[Sirius Mods]]</var> 8.1, it is possible to invoke an Object class method against any object. For example:<p class="code">b		In <var class="product">[[Sirius Mods]]</var> 8.1, it is possible to invoke an Object class method against any object. For example:<p class="code">b

Alex: /* List of Object methods */

2012-07-16T04:12:23Z

List of Object methods

← Older revision		Revision as of 04:12, 16 July 2012
Line 110:		Line 110:
	</p>		</p>

			==Heterogenous collections==
			One new capability enabled by the improved <var>Object</var> support
	==List of Object methods==		==List of Object methods==
	The [[List of Object methods\|"List of Object methods"]] shows all the class methods, with a brief description of each.		The [[List of Object methods\|"List of Object methods"]] shows all the class methods, with a brief description of each.

	[[Category:System classes]]		[[Category:System classes]]

Alex: /* Generic Print, Audit, and Trace Methods */

2012-07-16T04:10:26Z

Generic Print, Audit, and Trace Methods

@@ Line 53: / Line 53: @@
 ==Generic Print, Audit, and Trace Methods==
 <var class="product">[[Sirius Mods]]</var> 8.0 introduced generic Print, Audit, and Trace methods that could be applied to all User Language objects. So, to a large degree, these were essentially base Object class methods that could be invoked via User Language object variables. However, they did not behave like true Object class methods because they were not available to system classes and because one could not explicitly specify the methods class via <code>(object)</code> before the <var>Print</var>, <var>Audit</var>, or <var>Trace</var> method name. This meant that if a class had one or more of these methods already defined, there was no way to get at the Object class (generic) methods of the same name. These issues are all corrected in <var class="product">[[Sirius Mods]]</var> 8.1 so that the <var>Print</var>, <var>Audit</var>, and <var>Trace</var>methods are full-fledged members of the <var>Object</var> class.
 ==List of Object methods==
 The [[List of Object methods|"List of Object methods"]] shows all the class methods, with a brief description of each.
 [[Category:System classes]]

Alex at 03:35, 16 July 2012

2012-07-16T03:35:06Z

← Older revision		Revision as of 03:35, 16 July 2012
Line 51:		Line 51:
	%pair:(object)className=Pair		%pair:(object)className=Pair
	</p>		</p>
			==Generic Print, Audit, and Trace Methods==
			<var class="product">[[Sirius Mods]]</var> 8.0 introduced generic Print, Audit, and Trace methods that could be applied to all User Language objects. So, to a large degree, these were essentially base Object class methods that could be invoked via User Language object variables. However, they did not behave like true Object class methods because they were not available to system classes and because one could not explicitly specify the methods class via <code>(object)</code> before the <var>Print</var>, <var>Audit</var>, or <var>Trace</var> method name. This meant that if a class had one or more of these methods already defined, there was no way to get at the Object class (generic) methods of the same name. These issues are all corrected in <var class="product">[[Sirius Mods]]</var> 8.1 so that the <var>Print</var>, <var>Audit</var>, and <var>Trace</var>methods are full-fledged members of the <var>Object</var> class.
	==List of Object methods==		==List of Object methods==
	The [[List of Object methods\|"List of Object methods"]] shows all the class methods, with a brief description of each.		The [[List of Object methods\|"List of Object methods"]] shows all the class methods, with a brief description of each.

	[[Category:System classes]]		[[Category:System classes]]

Alex at 03:25, 16 July 2012

2012-07-16T03:25:48Z

← Older revision		Revision as of 03:25, 16 July 2012
Line 1:		Line 1:
	~~#REDIRECT~~ [[~~Global~~ and ~~session objects#Using~~ Object class methods ~~to access global and session objects~~]]		<!-- Object class -->
			The Object class is an implicit base class for '''all''' classes. However, until <var class="product">[[Sirius Mods]]</var> 8.1, there was no way to reference the Object base class via object variables of any of its extension classes (that is all classes other than the Object class) and there was no way to assign an variable of one class to a variable of its base Object class. This is all possible in <var class="product">[[Sirius Mods]]</var> 8.1.

			In <var class="product">[[Sirius Mods]]</var> 8.1, it is possible to invoke an Object class method against any object. For example:<p class="code">b

			%foo is object stringlist

			%foo = new
			printText {~=%foo:className}

			end
			</p>

			would display:<p class="code">%foo:className=System:Stringlist
			</p>

			And
			<p class="code">b
			class pair
			public
			variable x is float
			variable y is float
			end public
			end class

			%pair is object pair
			%pair = new
			printText {~=%pair:className}
			end
			</p>

			would display:<p class="code">%pair:className=Pair
			</p>
			These examples illustrate that not only is the Object class an implicit base class of every class (in fact it is not permissible to explicitly declare the Object class as a base class) but that every extension class of the Object class inherits the Object class member names so that the Object class does not have to be specified on an Object class member reference. However, as with other extension classes, all classes can "hide" a base class member by containing a member with the same name. For example, if we add the member <var>ClassName</var> to class <var>Pair</var> in the above example, <code>%pair:className</code> would refer to the Pair class <var>className</var>. However, in such a case, it would be possible to reference the Object class <var>className</var> by preceding it with <code>(object)</code> as in:<p class="code">b
			class pair
			public
			variable x is float
			variable y is float
			variable classname is string len 32
			end public
			end class

			%pair is object pair
			%pair = new
			%pair:className = 'This name makes no sense'
			printText {~=%pair:className}
			printText {~=%pair:(object)className}
			end
			</p>
			which displays:<p class="code">%pair:className=This name makes no sense
			%pair:(object)className=Pair
			</p>
			==List of Object methods==
			The [[List of Object methods\|"List of Object methods"]] shows all the class methods, with a brief description of each.

			[[Category:System classes]]

JAL2: Redirected page to Global and session objects#Using Object class methods to access global and session objects

2011-08-10T18:49:58Z

Redirected page to Global and session objects#Using Object class methods to access global and session objects

New page

#REDIRECT [[Global and session objects#Using Object class methods to access global and session objects]]