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expression that invokes a constructor look like Here is the throw expression in pop():
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// expression is a constructor call throw popOnEmpty();
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This throw expression creates an exception object of type popOnEmpty Recall that the member functions pop() and push() were defined to return a value of type bool: a true return value indicates that the operation succeeded, and a false return value indicates that it failed Because exceptions are now used to indicate the failure of the pop() and push() operations, the return values from these functions are now unnecessary We now define these member functions with a void return type For example:
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class iStack { public: // // no longer return a value void pop( int &value ); void push( int value ); private: // };
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The functions that use our iStack class will now assume that everything is fine unless an exception is thrown; they no longer need to test the return value of the member function pop() or push() to see whether the operation succeeds We will see how to define a function to handle exceptions in the next two sections We are now ready to provide the new implementations of iStack's pop() and push() member functions:
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#include "stackExcph" void iStack::pop( int &top_value ) { if ( empty() ) throw popOnEmpty(); top_value = _stack[ --_top ]; cout "iStack::pop(): " top_value endl; } void iStack::push( int value ) { cout "iStack::push( " value " )\n"; if ( full() ) throw pushOnFull(); _stack[ _top++ ] = value; }
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Although exceptions are most often objects of class type, a throw expression can throw an object of any type For example, although it's unusual, the function mathFunc() in the following code sample throws an exception object of enumeration type This code is
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enum EHstate { noErr, zeroOp, negativeOp, severeError }; int mathFunc( int i ) { if ( i == 0 ) throw zeroOp; // exception of enumeration type // otherwise, normal processing continues }
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Exercise 111 Which, if any, of the following throw expressions are errors Why For the valid throw expressions, indicate the type of the exception thrown
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(a) class exceptionType { }; throw exceptionType(); (b) int excpObj; throw excpObj; (c) enum mathErr { overflow, underflow, zeroDivide }; throw zeroDivide(); (d) int *pi = &excpObj; throw pi;
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Exercise 112 The IntArray class defined in Section 23 has a member operator function operator[]() that uses assert() to indicate that the index is outside the bounds of the array Change the definition of operator[]() to instead throw an exception in this situation Define an exception class to be used as the type of the exception thrown
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The following small program exercises our class iStack and the pop() and push() member functions defined in the previous section The for loop in main() iterates 50 times It pushes on the stack each value that is a multiple of 3 3, 6, 9, and so on Whenever the value is a multiple of 4, such as 4, 8, 12, and so on, it displays the contents of the stack Whenever the value is a multiple of 10, such as 10, 20, 30, and so on, it pops the last item from the stack and then displays the contents of the stack again How do we change main() to handle the exceptions thrown by the iStack member functions
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#include <iostream> #include "iStackh" int main() { iStack stack( 32 ); stackdisplay(); for ( int ix = 1; ix < 51; ++ix ) { if ( ix % 3 == 0 ) stackpush( ix ); if ( ix % 4 == 0 ) stackdisplay();
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