Exit Statements
Author: JTC1/SC22/WG9/ARG, by Randall Brukardt, ARG Editor

Ada Reference Manual — Legal Information

# 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.

#### Syntax

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exit_statement ::=
exit [loop_ name] [when condition];

#### Name Resolution Rules

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

#### Legality Rules

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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

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

#### Examples

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Examples of loops with exit statements:
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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;
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Main_Cycle:
loop
-- initial statements
exit Main_Cycle when Found;
-- final statements
end loop Main_Cycle;

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