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is not recommended Many compilers supply nonstandard versions of sprintf( ), often called something like snprintf( ), that allow you to specify the maximum number of characters that will be copied into the string If you are maintaining legacy C code, then it is recommended that you use such a function to help avoid problems You can send formatted output to a file by using fprintf( ) It is shown here: int fprintf(FILE *fp, const char *fmt, )
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It works just like printf( ), except that the formatted data is written to the file pointed to by fp The return value is the number of characters actually output If an error occurs, a negative number is returned Because fprintf( ) uses the C I/O system, which is based on file pointers rather than stream objects, you will not normally use it in C++ programs It is, of course, widely used in legacy C code
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CHAPTER
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ne of the problems with writing a programming cookbook is finding an appropriate stopping point There is a nearly unlimited universe of topics from which to choose, any number of which could merit inclusion It's difficult to find where to draw the line Of course, all books must end Thus, a stopping point, whether easily found or not, is always required This book is no exception In this, the final chapter of the book, I have chosen to conclude with an assortment of recipes that span a variety of topics These recipes represent techniques that I wanted covered in the book, but for which a complete chapter was, for one reason or another, not appropriate For example, I wanted to show how to overload C++'s special case operators, such as [ ], >, new and delete, and so on Although several recipes are dedicated to overloading these operators, there are not enough for a chapter of their own I also wanted to include recipes that address some common but isolated "How-To" questions, such as how to create a copy constructor, implement a conversion function, or use a runtime type ID All important topics, but none large enough for its own chapter Despite the wide-ranging nature of the recipes in this chapter, all do have two things in common: 1 They answer a frequently asked question 2 They are applicable to a wide range of programmers Furthermore, all describe key concepts that you can easily adapt and enhance Here are the recipes contained in this chapter: Operator Overloading Basic Techniques Overload the Function Call Operator ( ) Overload the Subscripting Operator [ ] Overload the > Operator Overload new and delete Overload the Increment and Decrement Operators Create a Conversion Function Create a Copy Constructor Determine an Object's Type at Runtime
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Copyright 2008 by The McGraw-Hill Companies Click here for terms of use
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Herb Schildt's C++ Programming Cookbook
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Key Ingredients
Headers Classes Functions ret-type operator#(param-list)
In C++, operators can be overloaded relative to a class, including classes that you create This lets you define what a specific operation, such as + or /, means for an object of the class It also lets objects of the class be used in expressions, in just the same way that you use the built-in types Recall that when you define a class, you are creating a new data type Through operator overloading, you can seamlessly integrate this new data type into your programming environment This type extensibility is one of C++'s most important and powerful features because it lets you expand the C++ type system to fit your needs Operator overloading will be familiar territory for most readers because it is a basic C++ skill and most programmers know how to overload the more commonly used operators For this reason, the operator overloading recipes in this chapter focus on these specialized operators: increment and decrement, ( ), [ ], >, and new and delete Many programmers find these operators confusing when it comes to overloading, and they are the source of many "How-To" questions However, for completeness, this recipe presents a brief review of the basic techniques used to overload an operator This overview is sufficient for the purposes of this chapter, but it is not a substitute for an in-depth examination of the topic
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