Difference between revisions of "ListCompare"

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(add Mono version)
m (<lsl> tag to <source>)
 
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|cat2=Library
|cat2=Library
|cat3=User-Defined Functions
|cat3=User-Defined Functions
|examples=<lsl>integer r = ListCompare([1, 2.0, "3"], [1, 2.0, "3"]); // Returns TRUE
|examples=<source lang="lsl2">integer r = ListCompare([1, 2.0, "3"], [1, 2.0, "3"]); // Returns TRUE
integer s = ListCompare([1, 2.0, 3], [1, 2.0, "3"]);  // Returns FALSE
integer s = ListCompare([1, 2.0, 3], [1, 2.0, "3"]);  // Returns FALSE
integer t = ListCompare([], [1, 2.0, "3"]);            // Returns FALSE</lsl>
integer t = ListCompare([], [1, 2.0, "3"]);            // Returns FALSE</source>
}}
}}


= Implementation for LSO =
= Implementation for LSO or MONO =
<lsl>integer ListCompare(list a, list b) {
<source lang="lsl2">
    integer aL = a != [];
    if (aL != (b != [])) return 0;
    if ((aL == 0) && (b == [])) return 1;
   
    return !llListFindList((a = []) + a, (b = []) + b);
}</lsl>
 
= Implementation for MONO =
<lsl>
integer ListCompare(list a, list b)  
integer ListCompare(list a, list b)  
{
{
     if (a != b)        return FALSE;    // Note: This is comparing list lengths only
     if (a != b)        return FALSE;    // Note: This is comparing list lengths only
     return !llListFindList(a, b);
 
    // The next line is only needed if compiling with LSO
    if (a == [])      return TRUE;    // both lists are empty (as both lists are the same length)
 
     return !llListFindList(a, b);
    // As both lists are the same length, llListFindList() can only return 0 or -1
    // Which we return as TRUE or FALSE respectively   
}
}
</lsl>
</source>

Latest revision as of 15:18, 22 January 2015

Summary

Function: integer ListCompare( list a, list b );

Efficiently compares two lists for equality (same contents in the same order).
Returns an integer TRUE if the lists are equal, FALSE if not.

• list a The first list to compare.
• list b The second list to compare.

Examples

integer r = ListCompare([1, 2.0, "3"], [1, 2.0, "3"]); // Returns TRUE
integer s = ListCompare([1, 2.0, 3], [1, 2.0, "3"]);   // Returns FALSE
integer t = ListCompare([], [1, 2.0, "3"]);            // Returns FALSE

Implementation for LSO or MONO

integer ListCompare(list a, list b) 
{
    if (a != b)        return FALSE;    // Note: This is comparing list lengths only

    // The next line is only needed if compiling with LSO
    if (a == [])       return TRUE;     // both lists are empty (as both lists are the same length)

    return !llListFindList(a, b);  
    // As both lists are the same length, llListFindList() can only return 0 or -1 
    // Which we return as TRUE or FALSE respectively    
}