Tag Archives: array

Memory chunks and inheriting enums

Type Chunk type represents a chunk of memory — either on stack or on heap. The latter use is pretty obvious, such types as Array or String will use it. The placement on stack is crucial for making variadic functions efficient — take for example C#, it supports variadic functions, but since arrays are allocated on heap, the comfort of using variadic functions comes at such price that it is not uncommon to see several overloads with unrolled parameters just to avoid variadic parameters.

Having Chunk allows efficient implementation of variadic functions — there is no memory allocation, just extra internal “parameter” (number of elements).

Unrelated to memory, another new feature is ability to inherit enums. From time to time I was annoyed I had to repeat enums in C# just to add few new entries (and remember to keep the same common values), so in Skila you simply derive one enum type from another and share common values. I am not sure if the inheritance is the correct mechanism here, because substitution rules are reversed for enums (you can pass base value when the derived type is required), but since it works I leave it as it is.

Ahead of me is reimplementing old rules of method-property derivation.

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Code injects — collections are getting closer

I see a scary pattern lately. I add new feature to Skila pretty quickly, but when it comes to cleaning the code (sadly, it is messy) I can spend a day on refactoring, polishing, removing dead pieces, and at the end it appears that I cleaned away one thing too many and I have no clue how to fix it while moving forward — so instead I have to rewind the changes, I make half of them again with commit on each step, and then I am too tired to make the second half, so I call it a day (the second one). The weekend just passes and I don’t know when…

I am working on at least one collection to introduce variadic functions in Skila, and this is the time when Skila and target language have to meet in the same code:

class Array<T>
	<?php
	public $data;
	?>

	func construct(size Int) do
		@ = size;
		<?php
		$this->data = array();
		?>
	end  
end

So far I didn’t solved the name matching problem, I rely on common sense of Skila translator, but I am too eager to finally see Skila programs working.

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