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935 Container Size Operations
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istrue if size is zero and false otherwise Theresize operation changes the number of elements in the container If the current size is greater than the new size, then elements are deleted from the back of the container If the current size is less than the new size, then elements are added to the back of the container:
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list<int> ilist(10, 42); ilistresize(15); ilistresize(25, -1); ilistresize(5);
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// 10ints: each has value 42 // adds 5 elements of value0to back of ilist // adds 10 elements of value -1 to back of ilist // erases 20 elements from the back of ilist
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Theresize operation takes an optional element-value argument If this argument is present, then any newly added elements receive this value If this argument is absent, then any new elements are value initialized (Section 331, p 92)
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resize can invalidate iterators A resize operation on a vector or deque potentially invalidates all iterators
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For any container type, if resize shrinks the container, then any iterator to an C++ deleted is invalidated element that isPrimer, Fourth Edition
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By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Professional Pub Date: February 14, 2005 98 Sequential Container Print ISBN: 0-201-72148-1 Pages: 912
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Table
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csize()
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Size Operations
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Table of Contents | Index
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Returns the number of elements in c Return type is c::size_type Returns maximum number of elements c can
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cmax_size()
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contain Return type is c::size_type 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 cempty() Returns a bool that indicates whether size is 0 or 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 not 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 cresize(n) Resizec so that it has n elements If N < csize(), Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the the excess elements are discarded If new elements language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes must be added, they are value initialized it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten Classic Restructured for quicker learning, using the C++ standard libraryAny elements the most current programming cresize(n,t) Resizec to have n elements Updated to teach added styles and program design techniques Filled with t learning aids that emphasize important points, warn about common have value new pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on the Web at the address below
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Exercises Section 935
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Exercise 922: Exercise 923:
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Given that vec holds 25 elements, what does vecresize(100) do What if we next wrote vecresize(10) What, if any, restrictions does using resize with a single size argument place on the element types
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936 Accessing Elements
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If a container is not empty, then the front and back members return references bound to the first or last elements in the container:
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// check that there are elements before dereferencing an iterator // or callingfront orback if (!ilistempty()) { // val and val2refer to the same element list<int>::reference val = *ilistbegin(); list<int>::reference val2 = ilistfront(); // lastand last2 refer to the same element
list<int>::reference last = *--ilistend(); list<int>::reference last2 = ilistback(); }
C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, Barbara different approaches to fetch a reference to the first and last elements This program uses twoE Moo inilist The direct approach is to call front or back Indirectly, we can obtain a reference to Publisher:Addison Wesley the same element by dereferencing the iterator returned by begin or the element one before Professional the iterator returned by end Two things are noteworthy in this program: The end iterator refers Pub Date: container so to fetch the last element we must first decrement that "one past the end" of theFebruary 14, 2005 Print ISBN: 0-201-72148-1 iterator The other important point is that before calling front or back or dereferencing the Pages: 912 iterators from begin or end we check that ilist isn't empty If the list were empty all of the Table of Contents |the if would be undefined operations in Index
When we introduced subscripting in Section 332 (p 94), we noted that the programmer must ensure that an element exists at the indicated subscript location The subscript operator itself This not check The same standard applies to using the front or back operations If the doespopular tutorial introduction to cautionC++ has been completely updated, reorganized, and rewritten to help programmers empty, these operations in a more undefined result If as C++ has evolved since the one container islearn the language faster and use ityield an modern, effective wayJust the container has only last edition, so then authors' approach to teaching it They reference to that element element,has the front and back each return anow 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 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 Classic Restructured for quicker learning, using the C++ standard library Updated tofrontthe most current programming Using a subscript that is out-of-range or calling teach or back on styles and programan empty containerwith new learningprogramming errors design techniques Filled are serious aids that emphasize important points, warn about common pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on the Web at the address below