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291 Designing Our Own Headers
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class definitions, extern variable declarations, and function declarations, about which we'll learn in Section 74 (p 251) Files that use or define these entities include the appropriate header(s)
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Proper use of header files can provide two benefits: All files are guaranteed to use the same declaration for a given entity; and should a declaration require change, only the header needs to be updated Some care should be taken in designing headers The declarations in a header should logically belong together A header takes time to compile If it is too large programmers may be reluctant to incur the compile-time cost of including it
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To reduce the compile time needed to process headers, some C++ implementations support precompiled header files For more details, consult the reference manual of your C++ implementation
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Headers Are for Declarations, Not Definitions
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When designing a header it is essential to remember the difference between definitions, which may only occur once, and declarations, which may occur multiple times (Section 235, p 52) The following statements are definitions and therefore should not appear in a header:
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extern int ival = 10; double fica_rate;
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C++ Primer, Fourth Edition
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// initializer, so it's a definition // no extern, so it's a definition
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By Stanley B Lippman,Jos e Lajoie, Barbara E extern, it has an initializer, which means this statement is a Althoughival is declared Moo definition Similarly, the declaration of fica_rate, although it does not have an initializer, is a Publisher:Addison Wesley definition because the extern keyword is absent Including either of these definitions in two or more files of theProfessional same program will result in a linker error complaining about multiple Pub Date: February 14, 2005 definitions Print ISBN: 0-201-72148-1 Pages: 912
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Table of Contents | Index
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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 thean executable file, we They now introduce compiler not only where to To produce authors' approach to teaching it must tell the the C++ standard library from the beginning, giving find our main function programs without first to find the every language detail Highlighting today's best readers the means to write usefulbut also where having to masterdefinition of the member functions defined write programs that are class Let's assume that we have two practices, they show how toby the Sales_itemsafe, can be built quickly, and yet offer outstanding performance files:maincc, which contains the definition of of C++, also Sales_itemcc , Examples that take advantage of the library, and explain the featuresmain, and show how to make the best use of the which As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes language contains the Sales_item member functions We might compile these it a valuablefollows: files as 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 $ CC -c programming practices, and provide by default Complete with aexe pitfalls, suggest goodmaincc Sales_itemcc # general usage tips generates exercises that reinforce skills # source code for the book's extended aout learned Authoritative and comprehensive in its coverageThesome compilers generate examples is available on the Web at the address below
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Compiling and Linking Multiple Source Files
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# puts the executable in mainexe $ CC -c maincc Sales_itemcc -o main
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where$ is our system prompt and # begins a command-line comment We can now run the executable file, which will run our main program If we have only changed one of our cc source files, it is more efficient to recompile only the file that actually changed Most compilers provide a way to separately compile each file This process usually yields a o file, where the o extension implies that the file contains object code The compiler lets us link object files together to form an executable On the system we use, in which the compiler is invoked by a command named CC, we would compile our program as follows:
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