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pragma Assertion_Policy(Check);
package Discr40 is
subtype Element is Integer;
type Vector is array (Positive range <>) of Element;
type Stack (Max_Length : Natural) is
record
Length : Natural;
Data : Vector (1 .. Max_Length);
end record;
function Not_Full (S : Stack) return Boolean is
(S.Length < S.Max_Length);
procedure Push (S: in out Stack; E : Element)
with Pre => Not_Full(S), -- Precodition
Post => -- Postcondition
(S.Length = S'Old.Length + 1) and
(S.Data (S.Length) = E) and
(for all J in 1 .. S'Old.Length =>
S.Data(J) = S'Old.Data(J));
end Discr40;
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