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Full Discussion: How to Declare an array of function pointers?
Top Forums Programming How to Declare an array of function pointers? Post 303018131 by spflanze on Tuesday 29th of May 2018 10:46:12 PM
Old 05-29-2018
How to Declare an array of function pointers?
I am attempting to create an array of function pointers. The examples I follow to do this are from:

support.microsoft.com/en-us/help/30580/how-to-declare-an-array-of-pointers-to-functions-in-visual-c

stackoverflow.com/questions/5093090/whats-the-syntax-for-declaring-an-array-of-function-pointers-without-using-a-se

thegeekstuff.com/2012/01/advanced-c-pointers/?utm_sou

Here is the syntax I came up with that I put in the class declaration of a header file:
Code:
double GetdCdK( double V );
double GetdCdn( double V );
double GetdCdVo( double V );
double GetdCdCo( double V );

// The below gets the error:
// include\junctioncap.h|142|error: cannot convert 'JunctionCap::GetdCdK' from type 'double (JunctionCap::)(double)' to type 'double (*)(double)'|
// for each of the three other functions also

double ( *jacobian[4] )( double ) = { GetdCdK, GetdCdn, GetdCdVo, GetdCdCo };

// The below gets the error:
// include\junctioncap.h|142|error: too many initializers for 'double (* [0])(double)'|
// In addition to the above errors.

double ( *jacobian[] )( double ) = { GetdCdK, GetdCdn, GetdCdVo, GetdCdCo };

What is wrong with this syntax? Can this be done in gcc?
Last edited by spflanze; 05-30-2018 at 05:41 PM..
 

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LEARN ABOUT REDHAT

nextafterf

NEXTAFTER(3)							libc math functions						      NEXTAFTER(3)

NAME

       nextafter, nexttoward - floating point number manipulation

SYNOPSIS

       #include <math.h>

       double nextafter(double x, double y);
       float nextafterf(float x, float y);
       long double nextafterl(long double x, long double y);

       double nexttoward(double x, long double y);
       float nexttowardf(float x, long double y);
       long double nexttowardl(long double x, long double y);

DESCRIPTION

       The  nextafter()  functions return the next representable neighbor of x in the direction towards y.  The size of the step between x and the
       result depends on the type of the result.  If x = y the function simply returns y.  If either value is NaN, then NaN is	returned.   Other-
       wise a value corresponding to the value of the least significant bit in the mantissa is added or subtracted, depending on the direction.

       The nexttoward() functions do the same as the nextafter() functions, except that they have a long double second argument.

       These functions will signal overflow or underflow if the result goes outside of the range of normalized numbers.

CONFORMING TO

       C99. This function is defined in IEC 559 (and the appendix with recommended functions in IEEE 754/IEEE 854).

SEE ALSO

       nearbyint(3)

GNU
								    2002-08-10							      NEXTAFTER(3)
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