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############################################################################
#
# File: hetero.icn
#
# Subject: Procedures to test structure typing
#
# Author: Ralph E. Griswold
#
# Date: April 19, 1996
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
#
#
############################################################################
procedure stypes(X, ref) #: types of structure elements
local op, types, t, k
op := proc("!", 1)
t := type(X)
op := if (t == "table") & (ref === 1) then "key"
if (t == "table") & (ref === 2) then {
types := set()
every k := key(X) do
insert(types, type(k) || ":" || type(X[k]))
return sort(types)
}
else if t == ("list" | "record" | "table" | "set") then {
types := set()
every insert(types, type(op(X)))
return sort(types)
}
else stop("*** invalid type to stypes()")
end
procedure homogeneous(X, ref)
if *stypes(X, ref) = 1 then return else fail
end
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