aggcat.spad line 299 [edit on github]
A stack is a bag where the last item inserted is the first item extracted.
pop!(s)
returns the top element x
, destructively removing x
from s
. Note: Use top(s)
to obtain x
without removing it from s
. Error: if s
is empty.
push!(x, s)
pushes x
onto stack s
, i.e. destructively changing s
so as to have a new first (top) element x
. Afterwards, pop!(s
) produces x
and pop!(s
) produces the original s
.
top(s)
returns the top element x
from s
; s
remains unchanged. Note: Use pop!(s)
to obtain x
and remove it from s
.
BagAggregate(S)
Collection(S)
InnerEvalable(S, S)
Evalable(S)