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In all previous examples the aggregate was the initial (and immutable) value of a constant. If the aggregate initializes a variable, then code is generated for it as a combination of individual assignments and loops over the target object. The declarations
Cr_Var1 : One_Dim := (2, 5, 7, 11);
Cr_Var2 : One_Dim := (others > -1);
generate the equivalent of
Cr_Var1 (1) := 2;
Cr_Var1 (2) := 3;
Cr_Var1 (3) := 5;
Cr_Var1 (4) := 11;
for I in Cr_Var2'range loop
Cr_Var2 (I) := =-1;
end loop;