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// attempt to modify the exception object eObj = severeErr; // intends to rethrow an exception of value severeErr throw; } }
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Because eObj is not a reference, the catch clause receives a copy of the exception object, and any modifications to eObj within the handler modify the local copy They do not affect the original exception object created by the throw expression It is this original exception object that is rethrown by the rethrow expression Because the original exception is not modified within the catch clause in our example, the object rethrown still has its initial zeroOp value To modify the original exception object, the exception declaration within the catch clause must declare a reference For example:
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catch ( EHstate &eObj ) { // modifies the exception object eObj = severeErr; // The value of the exception rethrown is severeErr throw; }
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eObj refers to the exception object created by the throw expression, and modifications to eObj in the catch clause affect the original exception object These modifications are part of the exception object that is rethrown Therefore, another good reason to declare the exception declaration of the catch clause as a reference is to ensure that modifications applied to the exception object within the catch clause are reflected in the exception object that is rethrown We will see another good reason why exception declarations for exceptions of class type should be references in Section 192, where we see how catch clauses can invoke the class virtual functions The Catch-All Handler A function may want to perform some action before it exits with a thrown exception even though it cannot handle the exception that is thrown For example, a function may acquire some resource, such as opening a file or allocating memory on the heap, and it may want to release this resource (close the file or release the memory) before it exits with the thrown exception For example:
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void manip() { resource res; reslock(); // locks a resource // use res // some action that causes an exception to be thrown resrelease(); // skipped if exception thrown }
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The release of the resource res is bypassed if an exception is thrown To guarantee that the resource is released, rather than provide a specific catch clause for every possible exception and because we can't know all the exceptions that might be thrown, we can use a catch-all catch clause This catch clause has an exception declaration of the form (), where the three dots are referred to as an ellipsis This catch clause is entered for any type of exception For example:
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// entered with any exception thrown catch ( ) { // place our code here }
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A catch() is used in combination with a rethrow expression The resource that has been locked is released within the compound statement of the catch clause before the exception is propagated further up the list of function calls with a rethrow expression:
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void manip() { resource res; reslock(); try { // use res // some action that causes an exception to be thrown } catch () { resrelease(); throw; } resrelease(); // skipped if exception thrown }
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To ensure that the resource is appropriately released if an exception is thrown and manip() exits with an exception, a catch() is used to release the resource before the exception is propagated to functions further up the list of function calls We can also manage the acquisition and release of a resource by encapsulating the resource in a class, and having the class constructor acquire the resource and the class destructor release the resource automatically We look at how to do this in 19 A catch () clause can be used by itself or in combination with other catch clauses If it is used in combination with other catch clauses, we must take some care when organizing the set of catch clauses associated with the try block Catch clauses are examined in turn, in the order in which they appear following the try block Once a match is found, subsequent catch clauses are not examined This implies that if a catch () is used in combination with other catch clauses, it must always be placed last in a list of exception handlers; otherwise, a compiler error is issued For example:
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try { stackdisplay(); for ( int ix = 1; ix < 51; ++ix ) { // same as before } } catch ( pushOnFull ) { } catch ( popOnEmpty ) { } catch () { } // must be last catch clause
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