Ada Programming/Delimiters/double dot


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

For example:

  • In numeric type definitions:
 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 notesEdit

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;

See alsoEdit

WikibookEdit

Ada Reference ManualEdit