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Table of Contents | Index
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int incr(int &val) { return ++val; } int main() 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 short v1 = 0; edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving const int v2 = 42; readers the means to write useful programs without first having to master every language detail Highlighting today's best int v3 = write programs // safe, can be built quickly, practices, they show how to incr(v1); that are error: v1 is not an int and yet offer outstanding performance v3 = incr(v2); // error: v2 isconst Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the // error: literals are of lvalues language As v3its= incr(0); the book's authoritative discussionnotfundamental C++ concepts and techniques makes in previous editions, v3 = even for more v2); // error: addition doesn't yield an lvalue it a valuable resourceincr(v1 + experienced programmersProgram Faster and More Effectively with This Rewritten Classic Restructured for = incr(v3);using// C++ standard library Updated to teach the most current programming the ok: v3 is a nonconst object type int int v4 quicker learning, styles and program design techniques Filled with new learning aids that emphasize important points, warn about common }
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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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The problem is that a non const reference (Section 25, p 59) may be bound only to nonconst object of exactly the same type Parameters that do not change the value of the corresponding argument should be const references Defining such parameters as non const references needlessly restricts the usefulness of a function As an example, we might write a program to find a given character in a string:
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// returns index of first occurrence of cinsorssize() ifcisn't in s // Note:sdoesn't change, so it should be a reference to const string::size_type find_char(string &s, char c) { string::size_type i = 0; while (i != ssize() && s[i] != c) ++i; // not found, look at next character return i; }
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This function takes its string argument as a plain (non const) reference, even though it doesn't modify that parameter One problem with this definition is that we cannot call it on a character string literal:
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if (find_char("Hello World", 'o')) //
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This call fails at compile time, even though we can convert the literal to a string
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Such problems can be surprisingly pervasive Even if our program has no const objects and we only call find_char on behalf of string objects (as opposed to on a string literal or an expression that yields a string), we can encounter compile-time problems For example, we C++ function is_sentence that wants to use find_char to determine whether a might have another Primer, Fourth Edition By a sentence: string represents Stanley B Lippman,Jos e Lajoie,
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Barbara E Moo bool is_sentence (const string &s) Publisher:Addison Wesley { Professional // ifPub Date:period and it's the last character in s there's a February 14, 2005 Print ISBN: 0-201-72148-1 // thensis a sentence Pages: 912 return (find_char(s, '') == ssize() - 1);
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Table of } Contents | Index
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As written, the call to find_char from inside is_sentence is a compile-time error The programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last parameter to is_sentence is a reference to const string and cannot be passed to find_char, edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving which expects a reference to a nonconst string
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help
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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 to teach the most current programming Reference parameters that are not changed should be styles and program design techniques Filled with new learning aids nonemphasize important points, warn about common references to const Plain, that const reference pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills parameters are less flexible Such parameters may not learned Authoritative and comprehensive in its coverageThe source codeor by arguments that are is available on be initialized by const objects, for the book's extended examples the Web at the address below literals or expressions that yield rvalues
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