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49_pdfsam_cs2022

49_pdfsam_cs2022 - Uses of function pointers Writing...

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Uses of function pointers Writing generic code A function can take a function as a parameter Example: a generic function to compute integrals double compute_integral(double a, double b, double (*f)(double)) { /* lots of code */ } double x_squared(double x) { return x * x; } double x_cubed(double x) { return x * x * x; } int main() { compute_integral(0, 1, x_squared); compute_integral(5, 9, x_cubed); }
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Function pointer example #include <stdio.h> void change_array( int *a, int size, int (*f)(int)) { int j; for( j=0; j < size; j++) a[j] = f(a[j]); } int add_one(int x) { return x + 1; } int square(int x) { return x * x; } int main() { int a[5] = { 0, 1, 2, 3, 4 }; change_array(a, 5, add_one); // increment every element change_array(a, 5, square); // square every element return 0; }
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Other examples qsort(), heapsort(), mergesort() are standard library functions for generic sorting defined in stdlib.h They take a comparison function as a parameter They can sort any type of array, as long as an appropriate comparison function is given Also available: lsearch() : linear search bsearch() : binary search through a sorted array
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