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Full Discussion: [bash] passing array to function
Top Forums Shell Programming and Scripting [bash] passing array to function Post 302364390 by ASGR on Friday 23rd of October 2009 01:21:31 AM
Old 10-23-2009
[bash] passing array to function
Hi,

I'm trying to write a function that reassigns an array to
another local array but the method used in reassigning
the array reformats the contents of the array which is
what I am trying to prevent.

The method used to load a file into an array works as
expected and the entire array is returned to the main
body of the script i.e. preserves all white spaces and
each line is stored in its respective array index.

Load the contents of a file into an array.
use: array_load _array_file_ $filename
Code:
local -a _ARRAY_
*
_ARRAY_[I++]=" \"$LINE\""
*
eval "$1=( ${_ARRAY_[@]} )"

However, when I try to reassign the array to another
local array within a function, the destination array is
reformatted. Each item within an array looses its
white spaces and gains it's own array index.

Assign array 2 to array 1
use: array_assign ARR1 ARR2
Code:
function array_assign
{
	local -a _ARRAY_
	_ARRAY_=( $(eval "echo \${$2[@]}") )
	eval "$1=( ${_ARRAY_[@]} )"
}

Correct array structure:
Code:
item1    item2    item3    item4

Array structure after passing to function and executing
'eval echo' on array when assigning to local variable:
Code:
item1
item2
item3
item4

As recommended, I did search the web and tried the
majority of the methods found, but I still ended with an
array that is transposed.

The objective is to have reusable code so the function
can't rely on global variables and only rely on the
variables passed to the function.

Solutions or a suggestion would be greatly appreciated.

A.
 

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LEARN ABOUT CENTOS

std::gslice

std::gslice(3)						     Library Functions Manual						    std::gslice(3)

NAME

       std::gslice -

SYNOPSIS

   Public Member Functions
       gslice ()
       gslice (size_t __o, const valarray< size_t > &__l, const valarray< size_t > &__s)
       gslice (const gslice &)
       ~gslice ()
       gslice & operator= (const gslice &)
       valarray< size_t > size () const
       size_t start () const
       valarray< size_t > stride () const

   Friends
       template<typename _Tp > class valarray

Detailed Description
       Class defining multi-dimensional subset of an array.

       The slice class represents a multi-dimensional subset of an array, specified by three parameter sets: start offset, size array, and stride
       array. The start offset is the index of the first element of the array that is part of the subset. The size and stride array describe each
       dimension of the slice. Size is the number of elements in that dimension, and stride is the distance in the array between successive
       elements in that dimension. Each dimension's size and stride is taken to begin at an array element described by the previous dimension. The
       size array and stride array must be the same size.

       For example, if you have offset==3, stride[0]==11, size[1]==3, stride[1]==3, then slice[0,0]==array[3], slice[0,1]==array[6],
       slice[0,2]==array[9], slice[1,0]==array[14], slice[1,1]==array[17], slice[1,2]==array[20].

       Definition at line 64 of file gslice.h.

Author
       Generated automatically by Doxygen for libstdc++ from the source code.

libstdc++							  Tue Jun 10 2014						    std::gslice(3)
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