Lazy Evaluation idea

gistfile1.hx

// The following will be macromagically transformed...

class LazyExample implements Lazy
{
	var values:Array<Int>;
	
	public function new()
	{
		this.values = [3, 5, 1, 7];
	}
	
	@lazy public function getSum():Int
	{
		var result = 0;
		for (value in values) result += value;
		return result;
	}
}

// ...into this:

class LazyExample implements Lazy
{
	var values:Array<Int>;
	
	public function new()
	{
		this.values = [3, 5, 1, 7];
	}
	
	private var _sum:Null<Int>;
	public function getSum():Int
	{
		if (this._sum != null) return this._sum;
		
		var result = 0;
		for (value in values) result += value;
		
		this._sum = result;
		return result;
	}
}