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if(!(*cmp) (a, b)) printf("Equal"); THE FOUNDATION OF C++
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performs the call to the function, in this case strcmp( ), which is pointed to by cmp with the arguments a and b This statement also represents the general form of using a function pointer to call the function it points to The parentheses are necessary around the *cmp because of C and C++ s precedence rules Actually, you can also just use cmp directly, if you like, as shown here:
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if(!cmp(a, b)) printf("Equal");
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This version also calls the function pointed to by cmp, but it uses the normal function syntax However, using the (*cmp) form tips off anyone reading your code that a function pointer is being used to indirectly call a function, instead of calling a function named cmp It is possible to call check( ) using strcmp directly, as shown here:
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check(s1, s2, strcmp);
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This statement would eliminate the need for an additional pointer variable You may be asking yourself why anyone would want to write a program this way In this example, nothing is gained and significant confusion is introduced However, there are times when it is advantageous to pass arbitrary functions to procedures or to keep an array of functions The following helps illustrate a use of function pointers When an interpreter is written, it is common for it to perform function calls to various support routines, such as the sine, cosine, and tangent functions Instead of having a large switch statement listing all of these functions, you can use an array of function pointers with the function to call determined by some index You can get the flavor of this type of use by studying the expanded version of the previous example In this program, check( ) can be made to check for either alphabetical equality or numeric equality by calling it with a different comparison function:
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#include #include #include #include <stdioh> <ctypeh> <stringh> <stdlibh>
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void check(char *a, char *b, int (*cmp) (const char *, const char *)); int numcmp(const char *a, const char *b);
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int main(void) { char s1[80], s2[80]; gets(s1); gets(s2); if(isalpha(*s1)) check(s1, s2, strcmp); else check(s1, s2, numcmp); return 0; } void check(char *a, char *b, int (*cmp) (const char *, const char *)) { printf("Testing for equality\n"); if(!(*cmp) (a, b)) printf("Equal"); else printf("Not equal"); } int numcmp(const char *a, const char *b) { if(atoi(a)==atoi(b)) return 0; else return 1; }
Implementation Issues
When you create functions, you should remember a few important things that affect their efficiency and usability These issues are the subject of this section
Parameters and General-Purpose Functions
A general-purpose function is one that is used in a variety of situations, perhaps by many different programmers Typically, you should not base general-purpose functions on global data All the information a function needs should be passed through parameters In the few cases in which this is not possible, you should use static variables Besides making your functions general-purpose, parameters keep your code readable and less susceptible to bugs caused by side effects
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Efficiency
Functions are the building blocks of C and C++, and crucial to the creation of all but the most trivial programs Nothing said in this section should be construed otherwise In certain specialized applications, however, you may need to eliminate a function and replace it with in-line code In-line code is the equivalent of a function s statements used without a call to that function In-line code should be substituted for function calls only when execution time is critical There are two reasons in-line code is faster than a function call First, a call instruction takes time to execute Second, arguments to be passed have to be placed on the stack, which also takes time For almost all applications, this very slight increase in execution time is of no significance But if it is, remember that each function call uses time that would be saved if the code in the function were placed in line For example, here are two versions of a program that prints the square of the numbers from 1 to 10 The in-line version runs faster than the other because the function call takes time
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