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i); l o o k f o r separator // // none found
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As before, Csv : : g e t fie l d is trivial, while Csv: : g e t n f i e l d is so short that it is implemented i n the class definition
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// g e t f i e l d : r e t u r n n - t h f i e l d s t r i n g Csv: : g e t f i e 1 d ( i n t n)
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i f (n < 0 I I n >= n f i e l d ) r e t u r n ""; else return field[n] ;
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Our test program is a simple variant o f the earlier one:
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SECTION 45
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// Csvtest main: t e s t Csv c l a s s i n t main(void)
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string line; Csv csv; while ( c s v g e t l i n e ( l i n e ) != 0) { cout << " l i n e = "' << l i n e <<"'\n"; f o r ( i n t i = 0 ; i < c s v g e t n f i e l d ( ) ; i++) tout << " f i e l d [ " << i << "1 = << c s v g e t f i e l d ( i ) << " ' \ n u ;
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return 0 ;
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The usage is different than with the C version though only in a minor way Depending on the compiler, the C++ version is anywhere from 40 percent to four times slower than the C version on a large input file of 30,000 lines with about 25 fields per line As we saw when comparing versions of markov, this variability is a reflection on library maturity The C++ source program is about 20 percent shorter
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Exercise4-5 Enhance the C++ implementation to overload subscripting with operator [I so that fields can be accessed as csv[i] Exercise 4-6 Write a Java version of the CSV library, then compare the three implementations for clarity robustness, and speed Exercise 4-7 Repackage the C++ version of the CSV code as an STL iterator Exercise 4-8 The C++ version permits multiple independent Csv instances to operate concurrently without interfering, a benefit of encapsulating all the state in an object that can be instantiated multiple times Modify the C version to achieve the same effect by replacing the global data structures with structures that are allocated and initialized by an explicit csvnew function
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45 Interface Principles
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In the previous sections we were working out the details of an interface which is the detailed boundary between code that provides a service and code that uses it An interface defines what some body of code does for its users, how the functions and perhaps data members can be used by the rest of the program Our CSV interface provides three functions-read a line, get a field, and return the number of fields-which are the only operations that can be performed To prosper an interface must be well suited for its task-simple, general regular, predictable, robust-and it niust adapt gracefully as its users and its implementation
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INTERFACES
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change Good interfaces follow a set of principles These are not independent or even consistent, but they help us describe what happens across the boundary between two pieces of software
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Hide implementation details The implementation behind the interface should be hidden from the rest of the program so it can be changed without affecting or breaking anything There are several terms for this kind of organizing principle; information hiding, encapsulation, abstraction, modularization, and the like all refer to related ideas An interface should hide details of the implementation that are irrelevant to the client (user) of the interface Details that are invisible can be changed without affecting the client, perhaps to extend the interface, make it more efficient, or even replace its implementation altogether The basic libraries of most programming languages provide familiar examples, though not always especially well-designed ones The C standard I 1 0 library is among the best known: a couple of dozen functions that open, close, read, write, and otherwise manipulate files The implementation of file I 1 0 is hidden behind a data type FILE*, whose properties one might be able to see (because they are often spelled out in < s t d io h>) but should not exploit If the header file does not include the actual structure declaration, just the name of the structure, this is sometimes called an opaque type, since its properties are not visible and all operations take place through a pointer to whatever real object lurks behind Avoid global variables; wherever possible it is better to pass references to all data through function arguments We strongly recommend against publicly visible data in all forms; it is too hard to maintain consistency of values if users can change variables at will Function interfaces make it easier to enforce access rules, but this principle is often violated The predefined I 1 0 streams like s t d i n and stdout are almost always defined as elements of a global array of FILE structures:
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extern FILE #define s t d i n #define stdout #define s t d e r r --iob[-NFILE] ; (&--iob[O]) (&--iob[l]) (81--iob[Z])
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This makes the implementation completely visible; it also means that one can't assign to s t d i n, stdout or s t d e r r , even though they look like variables The peculiar name --i ob uses the ANSI C convention of two leading underscores for private names that must be visible, which makes the names less likely to conflict with names in a program Classes in C++ and Java are better mechanisms for hiding information; they are central to the proper use of those languages The container classes of the C++ Standard Template Library that we used in 3 carry this even further: aside from some performance guarantees there is no information about implementation, and library creators can use any mechanism they like
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