Re: __mul()

[Christopher Eykamp <chris@...>]

On 3/20/2010 10:44 PM, Mark Hamburg wrote:
> See the specification for the __mul operator in the Lua spec (section 2.8).
>
> The implementation of the * operator looks in the metatable for a __mul entry. It does not perform a message send. It does not index the object. Once it finds the entry, it passes it the two operands. In other words, it does more or less exactly this:
>
> 	local temp = bot:getLoc()
> 	newpt = getmetatable(temp).__mul(temp, 2)
>    

With the exception of storing the intermediate in temp, isn't that 
pretty much the same as:

newpt = getmetatable(bot:getLoc()).__mul(bot:getLoc(), 2)

This works, but the * operator does not, so they are not doing quite 
exactly the same thing :-)

BTW, I cannot test using temp as an intermediate as shortly after I 
posted, my graphics card blew up, and my dev machine is now out of 
service until I get it fixed :-(

Thanks for your help,

Chris