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As mentioned, when C++ was first invented, the new operator did not throw an exception when an allocation error occurred Instead, it returned null (just like C s malloc( ) function) If you want to have new work this way instead of throwing an exception, call the new function as shown here: p_var = new(nothrow) type; Here, p_var is a pointer variable of type The nothrow form of new works like the original version of new from years ago Since it returns null on failure, it can be dropped into older code without having to add exception handling However, for new code, exceptions provide a better alternative To use the nothrow option, you must include the header <new> The following program shows this alternative approach to using new

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// Demonstrate nothrow version of new #include <iostream> #include <new> using namespace std; int main() { int *p, i; p = new(nothrow) int[32]; // use nothrow option if(!p) { cout << "Allocation failure\n"; return 1; } for(i=0; i<32; i++) p[i] = i; for(i=0; i<32; i++) cout << p[i] << " "; delete [] p; // free the memory return 0; }

As this program demonstrates, when using this approach you must check the pointer returned by new after each allocation request

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The first question is whether you want to get a bachelor s degree at a four-year university, or an associate degree or other certification at a junior college or trade school There are significant tradeoffs in both cases

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It is possible to overload new and delete You might want to do this to use some special allocation method For example, you may want allocation routines that automatically begin using a disk file as virtual memory when the heap has been exhausted Whatever the reason, it is a very simple matter to overload these operators The skeletons for the functions that overload new and delete are void *operator new(size_t size) { // perform allocation return pointer_to_memory; } void operator delete(void *p) { // free memory pointed to by p } The parameter size will contain the number of bytes needed to hold the object being allocated This value is automatically obtained for you The overloaded new function must return a pointer to the memory that it allocates or throw a bad_alloc exception if an allocation error occurs Beyond these constraints, the overloaded new function can do anything else you require When you allocate an object using new (whether your own version or not), the object s constructor is automatically called The delete function receives a pointer to the region of memory to free It must then release the memory pointed to by that pointer When an object is deleted, its destructor function is automatically called The new and delete operators can be overloaded globally so that all uses of these operators call your custom versions They can also be overloaded relative to one or more classes Let s begin with an example of overloading new and delete relative to a class For the sake of simplicity, no new allocation scheme will be used Instead, the overloaded operators will simply invoke the standard library functions malloc( ) and free( ) (In your own application, you may, of course, implement any alternative allocation scheme you like) To overload the new and delete operators for a class, simply make the overloaded operator functions class members For example, here the new and delete operators are overloaded for the loc class:.

#include <iostream> #include <cstdlib> #include <new> using namespace std;

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