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5.7 Exit Statements


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[An exit_statement is used to complete the execution of an enclosing loop_statement; the completion is conditional if the exit_statement includes a condition.]



exit_statement ::=
exit [loop_name] [when condition];

Name Resolution Rules


The loop_name, if any, in an exit_statement shall resolve to denote a loop_statement.

Legality Rules


Each exit_statement applies to a loop_statement; this is the loop_statement being exited. An exit_statement with a name is only allowed within the loop_statement denoted by the name, and applies to that loop_statement. An exit_statement without a name is only allowed within a loop_statement, and applies to the innermost enclosing one. An exit_statement that applies to a given loop_statement shall not appear within a body or accept_statement, if this construct is itself enclosed by the given loop_statement.

Dynamic Semantics


For the execution of an exit_statement, the condition, if present, is first evaluated. If the value of the condition is True, or if there is no condition, a transfer of control is done to complete the loop_statement. If the value of the condition is False, no transfer of control takes place.


NOTE Several nested loops can be exited by an exit_statement that names the outer loop.



Examples of loops with exit statements:


for N in 1 .. Max_Num_Items loop Get_New_Item(New_Item); Merge_Item(New_Item, Storage_File); exit when New_Item = Terminal_Item; end loop; 9 Main_Cycle: loop -- initial statements exit Main_Cycle when Found; -- final statements end loop Main_Cycle;