C Interfaces and Implementations: Techniques for Creating by David R. Hanson

By David R. Hanson

Each programmer and software program undertaking supervisor needs to grasp the artwork of making reusable software program modules; they're the construction blocks of enormous, trustworthy purposes. not like a few sleek object-oriented languages, C offers little linguistic help or motivation for growing reusable software programming interfaces (APIs). whereas so much C programmers use APIs and the libraries that enforce them in nearly each software they write, rather few programmers create and disseminate new, greatly appropriate APIs. C Interfaces and Implementations exhibits the way to create reusable APIs utilizing interface-based layout, a language-independent technique that separates interfaces from their implementations. this system is defined through instance. the writer describes intimately 24 interfaces and their implementations, supplying the reader with an intensive realizing of this layout technique. positive factors of C Interfaces and Implementations: *Concise interface descriptions that contain a reference guide for programmers attracted to utilizing the interfaces.* A guided journey of the code that implements every one chapter's interface tp support these enhancing or extending an interface or designing comparable interfaces. *In-depth specialize in "algorithm engineering:" the right way to package deal info buildings and similar algorithms into reusable modules. *Source code for twenty-four APIs and eight pattern functions is tested, with each one awarded as a "literate program" within which a radical clarification is interleaved with the resource code. *Rarely documented C programming tricks-of-the-trade. *Convenient entry to all resource code within the ebook through the area huge net at http://www.cs.princeton.edu/software/cii/ 0201498413B04062001

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Clients need to see only the interface. Indeed, they may have only the object code for an implementation. Clients share interfaces and implementations, thus avoiding unnecessary code duplication. This methodology also helps avoid bugs — interfaces and implementations are written and debugged once, but used often. 1 Interfaces An interface specifies only those identifiers that clients may use, hiding irrelevant representation details and algorithms as much as possible. This helps clients avoid dependencies on the specifics of particular implementations.

Arith_mod(x, y) is defined to be equal to x − y•Arith_div(x, y), so Arith_mod(-13, 5) is −13 − 5•(−3) = 2. The functions Arith_ceiling and Arith_floor follow similar conventions. Arith_ceiling(x, y) returns the least integer not less than the real quotient of x/y, and Arith_floor(x, y) returns the greatest integer not exceeding the real quotient of x/y. Arith_ceiling returns the integer to the right of x/y on the number line, and Arith_floor returns the integer to the left of x/y for all operands.

Com, Frank Liu Copyright © 1997 by David R. Hanson.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved. INTERFACES 17 Arith_div returns the quotient obtained by dividing x by y, and Arith_mod returns the corresponding remainder. When x and y are both positive or both negative, Arith_div(x, y) is equal to x/y and Arith_mod(x, y) is equal to x%y.

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