Parameter Dimensions Can Be Misleading in .NET

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Parameter Dimensions Can Be Misleading
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The compiler ignores any dimension we might specify for an array parameter Relying, incorrectly, on the dimension, we might write printValues as
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// parameter treated as const int*, size of array is ignored void printValues(const int ia[10]) { // this code assumes array has 10 elements; // disaster if argument has fewer than 10 elements! for (size_t i = 0; i != 10; ++i) { cout << ia[i] << endl; } }
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Although this code assumes that the array it is passed has at least 10 elements, nothing in C++ Primer, Fourth Edition the language enforces that assumption The following calls are all legal:
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By Stanley B Lippman,Jos e Lajoie, Barbara E Moo int main() Publisher:Addison Wesley { Professional int i = 0, j[2] = {0, 1}; Pub Date: February 14,// ok: &i isint*; probable run-time error 2005 printValues(&i); Print ISBN: 0-201-72148-1 j is converted to pointer to 0th printValues(j); // ok: Pages: 912 // element; argument has type int*;
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Table of Contents | Index
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// probable run-time error
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return 0; }
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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 Even though the compiler issues no complaints, both calls are in error, and probably will fail readers the means to write useful programs without first having to master every language detail Highlighting today's best at run time In each case, memory beyond the array will be accessed becauseprintValues practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance assumes that the array it is passed has at least 10 elements Depending on the values that Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the happen to be in that memory, the program will either produce spurious output or crash 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 to teach the most current programming styles and program design techniques Filled with new learning 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 foran array extended examples is available on When the compiler checks an argument to the book's parameter, it the Web at the address below checks only that the argument is a pointer and that the types of
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the pointer and the array elements match The size of the array is not checked
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Array Arguments
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As with any other type, we can define an array parameter as a reference or nonreference type Most commonly, arrays are passed as plain, nonreference types, which are quietly converted to pointers As usual, a nonreference type parameter is initialized as a copy of its corresponding argument When we pass an array, the argument is a pointer to the first element in the array That pointer value is copied; the array elements themselves are not copied The function operates on a copy of the pointer, so it cannot change the value of the argument pointer The function can, however, use that pointer to change the element values to which the pointer points Any changes through the pointer parameter are made to the array elements themselves
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Functions that do not change the elements of their array parameter should make the parameter a pointer to const:
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