By Scott Meyers
The 1st variation of powerful C++ offered approximately 100,000 copies and was once translated into 4 languages. it is easy to appreciate why. Scott Meyers' useful method of C++ defined the principles of thumb hired by way of the experts-the issues they generally do or often steer clear of doing-to produce transparent, right, effective code. each one of this book's 50 directions summarizes how to write greater C++, and the accompanying discussions are sponsored via particular examples. For this new version, Meyers transformed each guide within the ebook. the result's remarkable adherence to C++'s Draft foreign common, present compiler expertise, and the newest insights into using C++ for real-world purposes
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Extra info for Effective C++ : 50 specific ways to improve your programs and designs
Example text
There are three common syntactic forms for getting new objects of type T, and you need to deal with the possibility of exceptions for each of these forms: new T; new T (constructor arguments) ; new T [size] ; This oversimplifies the problem, however, because clients can define their own (overloaded) versions of operator new, so programs may contain an arbitrary number of different syntactic forms for using new. How, then, to cope? If you're willing to settle for a very simple errorhandling strategy, you can set things up so that if a request for memory cannot be satisfied, an error-handling function you specify is called.
Set_new_handler's parameter is a pointer to the function operator new should call if it can't allocate the requested memory. The return value of set_new_handler is a pointer to the function in effect for that purpose before set_new_handler was called. You use set_new_handler like this: / / function to call if operator new can't allocate enough memory void noMoreMemory() { cerr « "Unable to satisfy request for memory\n"; abort() ; } int main () { set_new_handler(noMoreMemory) ; int *pBigDataArray = new int[lOOOOOOOO]; If, as seems likely, operator new is unable to allocate space for 100,000,000 integers, noMoreMemory will be called, and the program will abort after issuing an error message.
By definition, sizeof (Base) can never be zero (even if it has no members), so if size is zero, the request will be forwarded to : : operator new, and it will become that function's responsibility to treat the request in a reasonable fashion. If you'd like to control memory allocation for arrays on a per-class basis, you need to implement operator new's array-specific cousin, operator new [ ]. ) If you decide to write operator new [ ] , remember that all you're doing is allocating raw memory - you can't do anything to the as-yet-nonexistent objects in the array.