Passing an instance of struct to functions in other src files Post: 302510133

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Top Forums Programming Passing an instance of struct to functions in other src files Post 302510133 by LMHmedchem on Friday 1st of April 2011 03:12:20 PM

04-01-2011

Registered User

Thanks again for your patient and thoughtful replies, they are a huge help.

I have a few instances where I have function definitions in header files. These are usually functions that are only included when specific things have been defined, #ifdef, etc. I guess it would be better to have the functions definitions in their own object and implement the abstraction in the make file by linking the additional objects under the specified conditions.

So for global variables, you declare those in a header file (as extern), and then include the .h in only one src file? Then you have to re-declare and initialize the var in the same src file where the header is included ? That is so different from Fortran when you have to include global (common) variables in every src file where they are used, and then if you re-declared it, you would get a compiler bonk.

I am still a bit confused about the function prototypes. Lets say we are not using extern "C", can I declare the function prototype (with no code block) in one and only one header file, or do I need to include the header file in every src file that will be using the function. The latter is my current understanding or how things work.

LMHmedchem

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LEARN ABOUT OPENSOLARIS

mlib_imageerode4

mlib_ImageErode4(3MLIB) 				    mediaLib Library Functions					   mlib_ImageErode4(3MLIB)

NAME

       mlib_ImageErode4 - four neighbor erode

SYNOPSIS

       cc [ flag... ] file... -lmlib [ library... ]
       #include <mlib.h>

       mlib_status mlib_ImageErode4(mlib_image *dst, const mlib_image *src);

DESCRIPTION

       The  mlib_ImageErode4()	function  performs  an erode operation on an image by using each pixel's four orthogonal neighbors. The source and
       destination images must be single-channel images. The data type can be MLIB_BIT, MLIB_SHORT, MLIB_USHORT, or MLIB_INT.

       For 4-neighbor binary images, it uses the following equation:

	 dst[x][y][0] = AND{ src[x][y][0],
			     src[x-1][y][0], src[x+1][y][0],
			     src[x][y-1][0], src[x][y+1][0] }

       For 4-neighbor grayscale images, it uses the following equation:

	 dst[x][y][0] = MIN{ src[x][y][0],
			     src[x-1][y][0], src[x+1][y][0],
			     src[x][y-1][0], src[x][y+1][0] }

       where x = 1, ..., w-2; y = 1, ..., h-2.

PARAMETERS

       The function takes the following arguments:

       dst    Pointer to destination image.

       src    Pointer to source image.

RETURN VALUES

       The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_ImageErode4_Fp(3MLIB), mlib_ImageErode8(3MLIB), mlib_ImageErode8_Fp(3MLIB), attributes(5)

SunOS 5.11							    2 Mar 2007						   mlib_ImageErode4(3MLIB)

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