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<TITLE>Solutions of common problems - Sorting Elements of an Array</TITLE>
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<H1>Solutions of common problems</H1>
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<H1><A NAME="SEC5" HREF="problems_toc.html#SEC5">Sorting Elements of an Array</A></H1>
 
This C module implements a function that sorts the elements of an array in
place.
It uses the O(n log n) Heapsort algorithm.
 
The module is instantiated by
<PRE>
   $/Tech/Sort.gnrc +instance=TYPE +referto=HDR :inst
</PRE>
where <CODE>TYPE</CODE> is the name of the array element type and <CODE>HDR.h</CODE>
is a file that defines the array element type, e.g.
<PRE>
   $/Adt/Sort.gnrc+instance=DefTableKey +referto=deftbl :inst
</PRE>
If the element type is predefined in C the <CODE>referto</CODE> parameter
is omitted, e.g.
<PRE>
   $/Adt/Sort.gnrc+instance=int :inst
</PRE>
 
All entities exported by this module can be used in specifications
of type <CODE>.lido</CODE>, <CODE>.init</CODE>, <CODE>.finl</CODE>, and <CODE>.con</CODE>.
They can also be used in <CODE>.pdl</CODE> specifications or in C modules 
if the interface file <CODE>SortTYPE.h</CODE> is imported there.
 
The module exports the following function:
 
<A NAME="IDX27"></A>
<DL COMPACT>
<DT><CODE>void SortTYPE (TYPE *arr, size_t n, TYPECmpFctType cmp)</CODE>
<DD><CODE>arr</CODE> points to the array to be sorted, which contains <CODE>n</CODE>
elements.
<CODE>cmp</CODE> is the function that defines the collating sequence for the
elements.
It's signature is <CODE>TYPE, TYPE -&#62; int</CODE>; it yields
-1 if the left argument should precede the right in the sorted array,
+1 if the left argument should follow the right in the sorted array,
and 0 if the order of the elements in the sorted array is immaterial.
</DL>
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