Sort.h

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/******************************************************************************************[Sort.h]
Copyright (c) 2003-2007, Niklas Een, Niklas Sorensson
Copyright (c) 2007-2010, Niklas Sorensson
 
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
associated documentation files (the "Software"), to deal in the Software without restriction,
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furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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**************************************************************************************************/
 
#ifndef Glucose_Sort_h
#define Glucose_Sort_h
 
#include "sat/glucose2/Vec.h"
 
//=================================================================================================
// Some sorting algorithms for vec's
 
ABC_NAMESPACE_CXX_HEADER_START
 
namespace Gluco2 {
 
template<class T>
struct LessThan_default {
    bool operator () (T x, T y) { return x < y; }
};
 
 
template <class T, class LessThan>
void selectionSort(T* array, int size, LessThan lt)
{
    int     i, j, best_i;
    T       tmp;
 
    for (i = 0; i < size-1; i++){
        best_i = i;
        for (j = i+1; j < size; j++){
            if (lt(array[j], array[best_i]))
                best_i = j;
        }
        tmp = array[i]; array[i] = array[best_i]; array[best_i] = tmp;
    }
}
template <class T> static inline void selectionSort(T* array, int size) {
    selectionSort(array, size, LessThan_default<T>()); }
 
template <class T, class LessThan>
void sort(T* array, int size, LessThan lt)
{
    if (size <= 15)
        selectionSort(array, size, lt);
 
    else{
        T           pivot = array[size / 2];
        T           tmp;
        int         i = -1;
        int         j = size;
 
        for(;;){
            do i++; while(lt(array[i], pivot));
            do j--; while(lt(pivot, array[j]));
 
            if (i >= j) break;
 
            tmp = array[i]; array[i] = array[j]; array[j] = tmp;
        }
 
        sort(array    , i     , lt);
        sort(&array[i], size-i, lt);
    }
}
template <class T> static inline void sort(T* array, int size) {
    sort(array, size, LessThan_default<T>()); }
 
 
//=================================================================================================
// For 'vec's:
 
 
template <class T, class LessThan> void sort(vec<T>& v, LessThan lt) {
    sort((T*)v, v.size(), lt); }
template <class T> void sort(vec<T>& v) {
    sort(v, LessThan_default<T>()); }
 
 
//=================================================================================================
}
 
ABC_NAMESPACE_CXX_HEADER_END
 
#endif