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11.3 Raise Statements

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A raise_statement raises an exception. 

Syntax

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raise_statement ::= raise;
      | raise exception_name [with string_expression];

Legality Rules

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The name, if any, in a raise_statement shall denote an exception. A raise_statement with no exception_name (that is, a re-raise statement) shall be within a handler, but not within a body enclosed by that handler. 

Name Resolution Rules

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  The expression, if any, in a raise_statement, is expected to be of type String.

Dynamic Semantics

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To raise an exception is to raise a new occurrence of that exception, as explained in 11.4. For the execution of a raise_statement with an exception_name, the named exception is raised. If a string_expression is present, the expression is evaluated and its value is associated with the exception occurrence. For the execution of a re-raise statement, the exception occurrence that caused transfer of control to the innermost enclosing handler is raised again. 

Examples

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Examples of raise statements: 
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raise Ada.IO_Exceptions.Name_Error;   -- see A.13
raise Queue_Error with "Buffer Full"; -- see 9.11
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raise;                                -- re-raise the current exception

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