Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change

Re^3: Scalars, Lists, and Arrays (run time)

by ysth (Canon)
on Feb 09, 2010 at 03:30 UTC ( #822125=note: print w/replies, xml ) Need Help??

in reply to Re^2: Scalars, Lists, and Arrays (run time)
in thread Scalars, Lists, and Arrays

Any contextual effects happening at compile time would be optimizations requiring extra code so I'm not surprised that I couldn't find any cases of that. It would also require some static analysis of the parsed code to even determine if the context can be known at compile time. This type of static analysis is pretty rare in perl.
But that analysis is exactly what happens - the syntax tree is descended and every operation applies context (or doesn't) to its operands, marking then as having list, scalar, or void context as determined by the operation. Then anything left unmarked gets context from the call stack at runtime.
A math joke: r = | |csc(θ)|+|sec(θ)|-||csc(θ)|-|sec(θ)|| |
Online Fortune Cookie Search
Office Space merchandise
  • Comment on Re^3: Scalars, Lists, and Arrays (run time)

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://822125]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others lurking in the Monastery: (11)
As of 2016-10-25 18:53 GMT
Find Nodes?
    Voting Booth?
    How many different varieties (color, size, etc) of socks do you have in your sock drawer?

    Results (326 votes). Check out past polls.