Ada 95 Quality and Style Guide | Chapter 10 |
10.5.3 Case Statement Versus elsifguideline
Use the case statement when measured performance indicates. example
subtype Small_Int is Integer range 1 .. 5; Switch : Small_Int; ... -- Case statement case Switch is when 1 => ... when 2 => ... when 3 => ... when 4 => ... when 5 => ... end case; -- "elsif construct" if Switch = 1 then ... elsif Switch = 2 then ... elsif Switch = 3 then ... elsif Switch = 4 then ... elsif Switch = 5 then ... end if;rationale
Determine the impact of using case statements versus the elsif construct. If the case statement is implemented using a small jump table, then it may be significantly more efficient than the if .. then .. elsif construct.
See also Guideline 8.4.6 for a discussion of the table-driven programming alternative.
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