Download Effective C++: 50 Specific Ways to Improve Your Programs and by Scott Meyers PDF

By Scott Meyers

The 1st version of powerful C++ offered approximately 100,000 copies and used to be translated into 4 languages. it is easy to appreciate why. Scott Meyers' functional method of C++ defined the principles of thumb hired by means of the experts-the issues they frequently do or more often than not keep away from doing-to produce transparent, right, effective code. every one of this book's 50 instructions summarizes how to write greater C++, and the accompanying discussions are subsidized by way of particular examples. For this re-creation, Meyers transformed each instruction within the publication. the result's unprecedented adherence to C++'s Draft overseas average, present compiler know-how, and the most recent insights into using C++ for real-world functions

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Additional info for Effective C++: 50 Specific Ways to Improve Your Programs and Design

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II representation for an II Airplane object class Airplane public: private: AirplaneRep *rep; } ; II pointer to representation 40 Memory Management Item 10 An Airplane object is not very big; it contains but a single pointer. ) When you allocate an Airplane object by calling operator new, however, you probably get back more memory than is needed to store this pointer (or pair of pointers). The reason for this seemingly wayward behavior has to do with the need for operator new and operator delete to communicate with one another.

Item 7 remarks that operator new contains an infinite loop, and the code above shows that loop explicitly - while (1) is about as infinite as it gets. The only way out of the loop is for memory to be successfully allocated or for the new-handling function to do one of the things described in Item 7: make more memory available, install a different new-handler, deinstall the new-handler, throw an exception of or derived from std: :bad_alloc, or fail to return. It should now be clear why the new-handler must do one of those things.

The memory chunks for Airplane objects themselves will be taken from these big blocks. Currently unused chunks will be organized into a linked list the free list - of chunks that are available for future Airplane use. This may make it sound like you'll have to pay for the overhead of a next field in every object (to support the list), but you won't: the space for the rep field (which is necessary only for memory chunks in use as Airplane objects) will also serve as the place to store the next pointer (because that pointer is needed only for chunks of memory not in use as Airplane objects).

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