GuShH's DevBlog » average http://gushh.net/blog This blog is about software, electronics engineering and game development. Tue, 24 Jan 2012 00:31:00 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Average template http://gushh.net/blog/average-template/ http://gushh.net/blog/average-template/#comments Wed, 05 Aug 2009 12:16:52 +0000 GuShH http://gushh.net/blog/?p=161 A tiny template for averaging numbers.
I needed this for a prototype and I didn’t want to “wing it” anymore.

I think there should be a package with similar templates that people could download to enhance the language, I’m just saying… It takes little to come up with this kind of code and in the end it’s always useful to have it around.

Macro Average_Register( _type )
 
	Structure AVERAGE#_type
		sum._type
		average._type
		count.i
	EndStructure
 
	Procedure.i Average#_type#_Create()
		Define.AVERAGE#_type *this = AllocateMemory( SizeOf( AVERAGE#_type ) )
		ProcedureReturn *this
	EndProcedure
 
	Procedure.i Average#_type#_Destroy( *this.AVERAGE#_type )
		FreeMemory( *this )
		*this = #Null
	EndProcedure
 
	Procedure._type Average#_type#_Calculate( *this.AVERAGE#_type )
		If *this\count And *this\sum
			*this\average = ( *this\sum / *this\count )
			ProcedureReturn	*this\average
		EndIf
	EndProcedure
 
	Procedure.i Average#_type#_Reset( *this.AVERAGE#_type )
		*this\sum 	= 0.0
		*this\average 	= 0.0
		*this\count 	= 0
	EndProcedure
 
	Procedure.i Average#_type#_Add( *this.AVERAGE#_type, sample.f )
		*this\sum 	+ sample
		*this\count 	+ 1
	EndProcedure
 
	Procedure.i Average#_type#_Count( *this.AVERAGE#_type )
		ProcedureReturn *this\count
	EndProcedure
 
	Procedure._type Average#_type#_Sum( *this.AVERAGE#_type )
		ProcedureReturn *this\sum
	EndProcedure
 
	Procedure._type Average#_type#_Get( *this.AVERAGE#_type )
		ProcedureReturn *this\average
	EndProcedure
 
EndMacro

You may register it as any numerical type.
Usage example:

Average_Register( f ) ; register with floats.
Define.AVERAGEf test
 
Averagef_Add( test, 1.0 )
Averagef_Add( test, 2.0 )
Averagef_Add( test, 3.0 )
Averagef_Add( test, 4.0 )
Averagef_Add( test, 5.0 )
 
Debug Averagef_Calculate( test )
Debug Averagef_Count( test )
Debug Averagef_Sum( test )
 
Averagef_Reset( test )
 
Debug Averagef_Calculate( test )
Debug Averagef_Count( test )
Debug Averagef_Sum( test )

You can allocate an instance of the structure with the Create function.
For example, if you registered the template as float, then you may create a dynamic “object” in this way:

Define.AVERAGEf *test = Averagef_Create() ; the *test variable holds an instance of the AVERAGEf structure

Likewise, you should call the Destroy() function to get rid of it.

Averagef_Destroy( *test )

Trivial but useful. I’m not particularly happy with the naming convention though. But, let’s not forget that this is not an attempt at emulating OOP at all; it’s just a way of giving flexibility to an encapsulated piece of code. For OOP there are proper languages and there is no point whatsoever in trying to emulate it.

Cheers

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