Sponsored Content
Full Discussion: Perl References/Dereferences
Top Forums Shell Programming and Scripting Perl References/Dereferences Post 302423370 by dinjo_jo on Friday 21st of May 2010 12:21:47 AM
Old 05-21-2010
Perl References/Dereferences

Can someone explain where can we actually used

Code:
print $var->[0];

or

print $$var[0]

When does the -> becomes necessary and when its optional.
 

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

IRIX books, manuals, references...

Does anyone out there know of ANY specific books pertaining to SGI's flavor of Unix - IRIX? I have been in contact with SGI directly and they have not supplied me with any usable reference material or manuals. I realize man pages are a good source for info, but I need to go a little deeper... (6 Replies)
Discussion started by: lozinit
6 Replies

2. AIX

AIX References?

Would like to know where or what is available to quickly develope my AIX skills. Training budget limited.. Thanks and have a great day! (1 Reply)
Discussion started by: lmwical
1 Replies

3. UNIX for Advanced & Expert Users

Compound indirect variable references

Using bash, I'm trying to read a .properties file (name=value pairs), assigning an indirect variable reference for each line in the file. The trick is that a property's value string may contain the name of a property that occurred earlier in the file, and I want the name of the 1st property to... (5 Replies)
Discussion started by: tkrussel
5 Replies

4. Programming

Wanted: References on Sockets and Threads for C

I'm looking at http://www.opengroup.org/pubs/online/7908799/xsh/pthread.h.html trying to understand mutexs and semaphores. Windows makes a distinction between the two. Is a mutex and semaphore different in unix land? Is there a tutorial on threading in unix somewhere? I'm also looking at... (4 Replies)
Discussion started by: siegfried
4 Replies

5. Shell Programming and Scripting

perl - passing hash references to functions

hi there I have the following script in which i have created a PrintHash() function. I want to pass to this function the reference to a hash (in the final code i will be passing different hashes to this print function hence the need for a function). I am getting an error Type of arg 1 to... (1 Reply)
Discussion started by: hcclnoodles
1 Replies

6. Shell Programming and Scripting

Strip one of two Patch references

This log file is wacky. the syntax puts this in the Installation line: Installation PATCH75682.91 of PATCH75681 complete Installation PATCH76537.91 of PATCH76537 complete Installation PATCH92217.91 of PATCH92217 complete So I'm looking for a sed 's///' to remove the first PATCHxxxx... (6 Replies)
Discussion started by: dba_frog
6 Replies

7. Shell Programming and Scripting

Query related to references in array in Perl

Hi All I have a doubt and want to be cleared I am using @array = (10, 20); $rarray = \@array; #print "$rarray\n"; #print "@$rarray\n"; $rr= \$array; #print $$rr; $rr++; print $$rr; As you can see the $rr contains the reference to the first element of the array , now as the... (5 Replies)
Discussion started by: parthmittal2007
5 Replies

8. Shell Programming and Scripting

awk Programming references

Hi all, I am new and I am very interested in Awk programming language and would like to know what references or books that really worked for you that was clear, concise with simple examples. much appreciated in advance. (1 Reply)
Discussion started by: Apollo
1 Replies

9. UNIX for Dummies Questions & Answers

Sort references

I have the following entries and want to perform a sort. Each entry is separated by a newline, however each line should not be considired seperate. Maybe an awk program or similar, or a small script. Anderson, E.R., Duvall, T.L., Jr., and Jefferies, S.M., 1990. Modelling of Solar... (6 Replies)
Discussion started by: kristinu
6 Replies
pods::SDL::GFX::ImageFilter(3pm)			User Contributed Perl Documentation			  pods::SDL::GFX::ImageFilter(3pm)

NAME
SDL::GFX::ImageFilter - image filtering functions CATEGORY
TODO, GFX METHODS
MMX_detect int gfx_image_MMX_detect() CODE: SDL_imageFilterMMXdetect(); MMX_off void gfx_image_MMX_off() CODE: SDL_imageFilterMMXoff(); MMX_on void gfx_image_MMX_on() CODE: SDL_imageFilterMMXon(); add int gfx_image_add(Src1, Src2, Dest, length) unsigned char *Src1 unsigned char *Src2 unsigned char *Dest int length CODE: RETVAL = SDL_imageFilterAdd(Src1, Src2, Dest, length); OUTPUT: RETVAL mean int gfx_image_mean(Src1, Src2, Dest, length) unsigned char *Src1 unsigned char *Src2 unsigned char *Dest int length CODE: RETVAL = SDL_imageFilterMean(Src1, Src2, Dest, length); OUTPUT: RETVAL sub int gfx_image_sub(Src1, Src2, Dest, length) unsigned char *Src1 unsigned char *Src2 unsigned char *Dest int length CODE: RETVAL = SDL_imageFilterSub(Src1, Src2, Dest, length); OUTPUT: RETVAL abs_diff int gfx_image_abs_diff(Src1, Src2, Dest, length) unsigned char *Src1 unsigned char *Src2 unsigned char *Dest int length CODE: RETVAL = SDL_imageFilterAbsDiff(Src1, Src2, Dest, length); OUTPUT: RETVAL mult int gfx_image_mult(Src1, Src2, Dest, length) unsigned char *Src1 unsigned char *Src2 unsigned char *Dest int length CODE: RETVAL = SDL_imageFilterMult(Src1, Src2, Dest, length); OUTPUT: RETVAL mult_nor int gfx_image_mult_nor(Src1, Src2, Dest, length) unsigned char *Src1 unsigned char *Src2 unsigned char *Dest int length CODE: RETVAL = SDL_imageFilterMultNor(Src1, Src2, Dest, length); OUTPUT: RETVAL mult_div_by_2 int gfx_image_mult_div_by_2(Src1, Src2, Dest, length) unsigned char *Src1 unsigned char *Src2 unsigned char *Dest int length CODE: RETVAL = SDL_imageFilterMultDivby2(Src1, Src2, Dest, length); OUTPUT: RETVAL mult_div_by_4 int gfx_image_mult_div_by_4(Src1, Src2, Dest, length) unsigned char *Src1 unsigned char *Src2 unsigned char *Dest int length CODE: RETVAL = SDL_imageFilterMultDivby4(Src1, Src2, Dest, length); OUTPUT: RETVAL bit_and int gfx_image_bit_and(Src1, Src2, Dest, length) unsigned char *Src1 unsigned char *Src2 unsigned char *Dest int length CODE: RETVAL = SDL_imageFilterBitAnd(Src1, Src2, Dest, length); OUTPUT: RETVAL bit_or int gfx_image_bit_or(Src1, Src2, Dest, length) unsigned char *Src1 unsigned char *Src2 unsigned char *Dest int length CODE: RETVAL = SDL_imageFilterBitOr(Src1, Src2, Dest, length); OUTPUT: RETVAL div int gfx_image_div(Src1, Src2, Dest, length) unsigned char *Src1 unsigned char *Src2 unsigned char *Dest int length CODE: RETVAL = SDL_imageFilterDiv(Src1, Src2, Dest, length); OUTPUT: RETVAL bit_negation int gfx_image_bit_negation(Src1, Dest, length) unsigned char *Src1 unsigned char *Dest int length CODE: RETVAL = SDL_imageFilterBitNegation(Src1, Dest, length); OUTPUT: RETVAL add_byte int gfx_image_add_byte(Src1, Dest, length, C) unsigned char *Src1 unsigned char *Dest int length unsigned char C CODE: RETVAL = SDL_imageFilterAddByte(Src1, Dest, length, C); OUTPUT: RETVAL add_uint int gfx_image_add_uint(Src1, Dest, length, C) unsigned char *Src1 unsigned char *Dest int length unsigned int C CODE: RETVAL = SDL_imageFilterAddUint(Src1, Dest, length, C); OUTPUT: RETVAL add_byte_to_half int gfx_image_add_byte_to_half(Src1, Dest, length, C) unsigned char *Src1 unsigned char *Dest int length unsigned char C CODE: RETVAL = SDL_imageFilterAddByteToHalf(Src1, Dest, length, C); OUTPUT: RETVAL sub_byte int gfx_image_sub_byte(Src1, Dest, length, C) unsigned char *Src1 unsigned char *Dest int length unsigned char C CODE: RETVAL = SDL_imageFilterSubByte(Src1, Dest, length, C); OUTPUT: RETVAL sub_uint int gfx_image_sub_uint(Src1, Dest, length, C) unsigned char *Src1 unsigned char *Dest int length unsigned int C CODE: RETVAL = SDL_imageFilterSubUint(Src1, Dest, length, C); OUTPUT: RETVAL shift_right int gfx_image_shift_right(Src1, Dest, length, N) unsigned char *Src1 unsigned char *Dest int length unsigned char N CODE: RETVAL = SDL_imageFilterShiftRight(Src1, Dest, length, N); OUTPUT: RETVAL shift_right_uint int gfx_image_shift_right_uint(Src1, Dest, length, N) unsigned char *Src1 unsigned char *Dest int length unsigned char N CODE: RETVAL = SDL_imageFilterShiftRightUint(Src1, Dest, length, N); OUTPUT: RETVAL mult_by_byte int gfx_image_mult_by_byte(Src1, Dest, length, C) unsigned char *Src1 unsigned char *Dest int length unsigned char C CODE: RETVAL = SDL_imageFilterMultByByte(Src1, Dest, length, C); OUTPUT: RETVAL shift_right_and_mult_by_byte int gfx_image_shift_right_and_mult_by_byte(Src1, Dest, length, N, C) unsigned char *Src1 unsigned char *Dest int length unsigned char N unsigned char C CODE: RETVAL = SDL_imageFilterShiftRightAndMultByByte(Src1, Dest, length, N, C); OUTPUT: RETVAL shift_left_byte int gfx_image_shift_left_byte(Src1, Dest, length, N) unsigned char *Src1 unsigned char *Dest int length unsigned char N CODE: RETVAL = SDL_imageFilterShiftLeftByte(Src1, Dest, length, N); OUTPUT: RETVAL shift_left_uint int gfx_image_shift_left_uint(Src1, Dest, length, N) unsigned char *Src1 unsigned char *Dest int length unsigned char N CODE: RETVAL = SDL_imageFilterShiftLeftUint(Src1, Dest, length, N); OUTPUT: RETVAL shift_left int gfx_image_shift_left(Src1, Dest, length, N) unsigned char *Src1 unsigned char *Dest int length unsigned char N CODE: RETVAL = SDL_imageFilterShiftLeft(Src1, Dest, length, N); OUTPUT: RETVAL binarize_using_threshold int gfx_image_binarize_using_threshold(Src1, Dest, length, T) unsigned char *Src1 unsigned char *Dest int length unsigned char T CODE: RETVAL = SDL_imageFilterBinarizeUsingThreshold(Src1, Dest, length, T); OUTPUT: RETVAL clip_to_range int gfx_image_clip_to_range(Src1, Dest, length, Tmin, Tmax) unsigned char *Src1 unsigned char *Dest int length unsigned char Tmin unsigned char Tmax CODE: RETVAL = SDL_imageFilterClipToRange(Src1, Dest, length, Tmin, Tmax); OUTPUT: RETVAL normalize_linear int gfx_image_normalize_linear(Src1, Dest, length, Cmin, Cmax, Nmin, Nmax) unsigned char *Src1 unsigned char *Dest int length int Cmin int Cmax int Nmin int Nmax CODE: RETVAL = SDL_imageFilterNormalizeLinear(Src1, Dest, length, Cmin, Cmax, Nmin, Nmax); OUTPUT: RETVAL convolve_kernel_3x3_divide int gfx_image_convolve_kernel_3x3_divide(Src, Dest, rows, columns, Kernel, Divisor) unsigned char *Src unsigned char *Dest int rows int columns Sint16 *Kernel unsigned char Divisor CODE: RETVAL = SDL_imageFilterConvolveKernel3x3Divide(Src, Dest, rows, columns, Kernel, Divisor); OUTPUT: RETVAL convolve_kernel_5x5_divide int gfx_image_convolve_kernel_5x5_divide(Src, Dest, rows, columns, Kernel, Divisor) unsigned char *Src unsigned char *Dest int rows int columns Sint16 *Kernel unsigned char Divisor CODE: RETVAL = SDL_imageFilterConvolveKernel5x5Divide(Src, Dest, rows, columns, Kernel, Divisor); OUTPUT: RETVAL convolve_kernel_7x7_divide int gfx_image_convolve_kernel_7x7_divide(Src, Dest, rows, columns, Kernel, Divisor) unsigned char *Src unsigned char *Dest int rows int columns Sint16 *Kernel unsigned char Divisor CODE: RETVAL = SDL_imageFilterConvolveKernel7x7Divide(Src, Dest, rows, columns, Kernel, Divisor); OUTPUT: RETVAL convolve_kernel_9x9_divide int gfx_image_convolve_kernel_9x9_divide(Src, Dest, rows, columns, Kernel, Divisor) unsigned char *Src unsigned char *Dest int rows int columns Sint16 *Kernel unsigned char Divisor CODE: RETVAL = SDL_imageFilterConvolveKernel9x9Divide(Src, Dest, rows, columns, Kernel, Divisor); OUTPUT: RETVAL convolve_kernel_3x3_shift_right int gfx_image_convolve_kernel_3x3_shift_right(Src, Dest, rows, columns, Kernel, NRightShift) unsigned char *Src unsigned char *Dest int rows int columns Sint16 *Kernel unsigned char NRightShift CODE: RETVAL = SDL_imageFilterConvolveKernel3x3ShiftRight(Src, Dest, rows, columns, Kernel, NRightShift); OUTPUT: RETVAL convolve_kernel_5x5_shift_right int gfx_image_convolve_kernel_5x5_shift_right(Src, Dest, rows, columns, Kernel, NRightShift) unsigned char *Src unsigned char *Dest int rows int columns Sint16 *Kernel unsigned char NRightShift CODE: RETVAL = SDL_imageFilterConvolveKernel5x5ShiftRight(Src, Dest, rows, columns, Kernel, NRightShift); OUTPUT: RETVAL convolve_kernel_7x7_shift_right int gfx_image_convolve_kernel_7x7_shift_right(Src, Dest, rows, columns, Kernel, NRightShift) unsigned char *Src unsigned char *Dest int rows int columns Sint16 *Kernel unsigned char NRightShift CODE: RETVAL = SDL_imageFilterConvolveKernel7x7ShiftRight(Src, Dest, rows, columns, Kernel, NRightShift); OUTPUT: RETVAL convolve_kernel_9x9_shift_right int gfx_image_convolve_kernel_9x9_shift_right(Src, Dest, rows, columns, Kernel, NRightShift) unsigned char *Src unsigned char *Dest int rows int columns Sint16 *Kernel unsigned char NRightShift CODE: RETVAL = SDL_imageFilterConvolveKernel9x9ShiftRight(Src, Dest, rows, columns, Kernel, NRightShift); OUTPUT: RETVAL sobel_x int gfx_image_sobel_x(Src, Dest, rows, columns) unsigned char *Src unsigned char *Dest int rows int columns CODE: RETVAL = SDL_imageFilterSobelX(Src, Dest, rows, columns); OUTPUT: RETVAL sobel_x_shift_right int gfx_image_sobel_x_shift_right(Src, Dest, rows, columns, NRightShift) unsigned char *Src unsigned char *Dest int rows int columns unsigned char NRightShift CODE: RETVAL = SDL_imageFilterSobelXShiftRight(Src, Dest, rows, columns, NRightShift); OUTPUT: RETVAL align_stack void gfx_image_align_stack() CODE: SDL_imageFilterAlignStack(); restore_stack void gfx_image_restore_stack() CODE: SDL_imageFilterRestoreStack(); AUTHORS
See "AUTHORS" in SDL. perl v5.14.2 2012-05-28 pods::SDL::GFX::ImageFilter(3pm)
All times are GMT -4. The time now is 07:01 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy