Ada Programming/Delimiters/double dot

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The delimiter .. is used to specify ranges in any scalar type.

For example:

type Count is range 0 .. Max_Count;

subtype Week_Day is Day_Name range Monday .. Friday;

Vector_A : Vector (0 .. 31);

exit when X in Y .. Y + Epsilon;

for Day in Day_Name range Monday .. Thursday loop
   -- ...
end loop;

Vector_A (Vector_A'First .. Vector_A'First + Vector_B'Length - 1) := Vector_B;

Usage notes

When a whole type range will be specified, it is better to use the Range attribute.

For example, instead of using:

for Day in range Day_Name'First .. Day_Name'Last loop
   -- ...
end loop;

it is better to use:

for Day in Day_Name'Range loop
   -- ...
end loop;