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 constructing reusable software program modules; they're the construction blocks of enormous, trustworthy purposes. not like a few smooth object-oriented languages, C presents little linguistic help or motivation for growing reusable program programming interfaces (APIs). whereas such a lot C programmers use APIs and the libraries that enforce them in virtually each program they write, particularly few programmers create and disseminate new, extensively acceptable 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 by way of instance. the writer describes intimately 24 interfaces and their implementations, supplying the reader with a radical figuring out of this layout process. gains of C Interfaces and Implementations: *Concise interface descriptions that contain a reference guide for programmers attracted to utilizing the interfaces.* A guided travel of the code that implements each one chapter's interface tp support these editing or extending an interface or designing comparable interfaces. *In-depth specialize in "algorithm engineering:" the right way to package deal information constructions and similar algorithms into reusable modules. *Source code for twenty-four APIs and eight pattern purposes is tested, with each one offered as a "literate program" during 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 realm broad net at http://www.cs.princeton.edu/software/cii/ 0201498413B04062001

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10 Copying the strings can be avoided if the client promises not to deallocate them, which is trivially true for string constants. Implement extern const char *Atom_add(const char *str, int len); which works like Atom_new but doesn’t make a copy of the sequence. 8), what checked runtime errors must be specified and implemented? C Interfaces and Implementations: Techniques for Creating Reusable Software. com, Frank Liu Copyright © 1997 by David R. Hanson..

NEW(p) allocates an instance of the structure pointed to by p, so its use in Stack_new allocates a new Stack_T structure. Stack_empty returns one if the count field is 0 and zero otherwise: ¢functions 26²+≡ int Stack_empty(T stk) { assert(stk); return stk->count == 0; } assert(stk) implements the checked runtime error that forbids a null T to be passed to any function in Stack. assert(e) is an assertion that e is nonzero for any expression e. It does nothing if e is nonzero, and halts program execution otherwise.

Ideally, these operations don’t reveal representation details on which clients might implicitly depend. The canonical example of an abstract data type, or ADT, is the stack. h²≡ #ifndef STACK_INCLUDED #define STACK_INCLUDED typedef struct Stack_T *Stack_T; extern extern extern extern extern Stack_T Stack_new (void); int Stack_empty(Stack_T void Stack_push (Stack_T void *Stack_pop (Stack_T void Stack_free (Stack_T stk); stk, void *x); stk); *stk); #endif The typedef defines the type Stack_T, which is a pointer to a structure with a tag of the same name.

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