Logical And

SWF Action

Action Category:

Logical and Bitwise

Action Details:

Action Identifier:

Action Structure:

<n.a.>

Action Length:

0 byte(s)

Action Stack:

pop 2 (b), push 1 (b)

Action Operation:

b₁ := pop();
b₂ := pop();
r := b₂ && b₁;
push(r);

Action Flash Version:

See Also:

And

Logical Not

Logical Or

XOr

Pop two values, compute the Logical AND and put the Boolean result back on the stack.

b₁	b₂	Result
false	false	false
true	false	false
false	true	false
true	true	true

Logical AND table

IMPORTANT NOTE

If b₂ is the result of a function call and b₁ is false, then that function should not be called. With this action, however, b₁ and b₂ are just Boolean values on the stack. So to properly implement a Logical AND in your compiler you want to do something like this:

call f1       // b1 does not need to come from a function call
duplicate
logical not
branch if true, skip
call f2
logical and   // we could also pop just before calling f2
label skip: