delphi - Shall I free/destroy exceptions after exception handling? -

i'm debugging delphi program.

except     on e: terrortapedrive         if e.errorcode = 1104             if assigned(indexdoneevent)                 indexdoneevent;         // other handling...     // other handling... end; 

i catch excetion e , need. now, when debug program counter reach line below end;, if hover e.errorcode cursor, can still see value. expect out of scope and, eventually, destroyed.

so, question is: shall free/destroy exceptions after exception handling?

the runtime takes ownership of exceptions after raised. not need free them.

the exception destroyed @ end of block in handled, demonstrated program:

{$apptype console}  uses   sysutils;  type   myexception = class(exception)   public     destructor destroy; override;   end;  destructor myexception.destroy; begin   writeln('myexception.destroy');   inherited; end;  procedure main; begin   try     raise myexception.create('boo');   except     on e: exception       writeln(e.classname, ': ', e.message);   end;   writeln('after try/except block'); end;  begin   main;   readln; end. 

which outputs:

 myexception: boo myexception.destroy after try/except block 

whilst debugger may still show information exception after has been freed, behaviour undefined. compiler understands exception has left scope, if debugger ignorant of fact.

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if want exception's lifetime extend beyond except block handles need call acquireexceptionobject. once that, becomes responsibility free exception lifetime acquired.