Figure 181 illustrates the meaning of these pointers in Visual Studio .NET

Printing Data Matrix in Visual Studio .NET Figure 181 illustrates the meaning of these pointers
Figure 181 illustrates the meaning of these pointers
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Figure 181 Vector Memory Allocation Strategy
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Professional We can use these pointers to determine the size and capacity of the Vector: Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Thesize of Pages: 912 (the number of elements actually in use) is equal to first_free a Vector
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Table ofelements Contents | Index
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Thecapacity of a Vector (the total number of elements that could be defined before the Vector has to be reallocated) is equal to end elements
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help The free capacity (the number it elements that can be added C++ has evolved since the is programmers learn the language faster and use ofin a more modern, effective wayJust asbefore a reallocation last necessary) is end first_free edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving readers the means to write useful programs without first having to master every language detail Highlighting today's best practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the Usingconstruct language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten Thepush_back member uses these pointers to add a new element to the end of the Vector: Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming styles and program design techniques Filled with new learning aids that emphasize important points, warn about common pitfalls,template <class T>practices, and provide general usage tips Complete with exercises that reinforce skills suggest good programming learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on void Vector<T>::push_back(const T& t) the Web at the address below {
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// are we out of space if (first_free == end) reallocate(); // gets more space and copies existing elements to it allocconstruct(first_free, t); ++first_free; }
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Thepush_back function starts by determining whether there is space available If not, it calls reallocate That member allocates new space and copies the existing elements It resets the pointers to point to the newly allocated space Oncepush_back knows that there is room for the new element, it asks the allocator object to construct a new last element The construct function uses the copy constructor for type T to copy the value t into the element denoted by first_free It then increments first_free to indicate that one more element is in use
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Reallocating and Copying Elements
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Thereallocate function has the most work to do:
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template <class T> void Vector<T>::reallocate() { // compute size of current array and allocate space for twice as many elements std::ptrdiff_t size = first_free - elements; std::ptrdiff_t newcapacity = 2 * max(size, 1); // allocate space to hold newcapacity number of elements of type T T* newelements = allocallocate(newcapacity);
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// construct copies of the existing elements in the new space uninitialized_copy(elements, first_free, newelements); // destroyPrimer, Fourth Edition C++ the old elements in reverse order for (T Stanley B Lippman,Jos e Lajoie, elements; /* empty */ ) *p = first_free; p != By allocdestroy(--p); Barbara E Moo // deallocatecannot be called on a 0 pointer Publisher:Addison Wesley if (elements) Professional // return the memory that held the elements Pub Date: February 14, 2005 allocdeallocate(elements, end - elements); Print ISBN: 0-201-72148-1 // make our 912 structure point to the new elements Pages: data elements = newelements; Table of Contents | Index first_free = elements + size; end = elements + newcapacity; }
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving readers a simple but useful programs without first having to master every language detail much memory each We usethe means to write surprisingly effective strategy of allocating twice as Highlighting today's best practices, reallocate to write programs that are safe, can be built the current number of elements in time we they show how The function starts by calculatingquickly, and yet offer outstanding performance use, Examples that number, of the library, the allocator object to obtain how to make the best use of space doubling that take advantageand asking and explain the features of C++, also showthe desired amount of the language As in is empty, we allocate two elements If the Vector its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten IfVector holds int s, the call to allocate allocates library Updated to teach the most current programming it Classic Restructured for quicker learning, using the C++ standard space for newcapacity number of int s If holdsstrings, then it techniques Filled with new learning aids that emphasize important points, warn about common styles and program design allocates that space for the given number of strings pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills The call to uninitialized_copy usescoverageThe source code for the the standardexamples is available on learned Authoritative and comprehensive in its a specialized version of book's extended copy algorithm This version at the address below the Web expects its destination to be raw, unconstructed memory Rather than assigning
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elements from the input range to the destination, it copy-constructs each element in the destination The copy constructor for T is used to copy each element from the input range to the destination Thefor loop calls the allocator member destroy on each object in the old array It destroys the elements in reverse order, starting with the last element in the array and finishing with the first The destroy function runs the destructor for type T to free any resources used by the old elements Once the elements have been copied and destroyed, we free the space used by the original array We must check that elements actually pointed to an array before calling deallocate
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deallocate expects a pointer that points to space that was allocated by allocate It is not legal to pass deallocate a zero
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