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*/ |
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|
| 26 |
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/** |
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< |
* @file GenerateCombination.hpp |
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> |
* @file next_combination.hpp |
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* @author tlin |
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* @date 10/27/2004 |
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* @version 1.0 |
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namespace oopse { |
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|
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/** |
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– |
* @fn bool next_combination(IteratorContainer<RandomAccessIterator>& iterContainer, RandomAccessIterator first, RandomAccessIterator last) |
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* @brief STL next_permuationtation like combination sequence generator. |
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< |
* Given the first and last iterator of a sequence, next_combination iteratively generates all possible combination. |
| 43 |
> |
* Given the first and last iterator of a sequence, next_combination iteratively generates all |
| 44 |
> |
* possible combinations. |
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> |
* @return if more combination is availiable, otherwise return false |
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* @param iterContainer iterator container |
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* @param first the first iterator |
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* @param last the last iterator |
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< |
* @note first and last must be random access iterators and iterContainer must be the container which |
| 50 |
< |
* element is iterator. And all of the iteratos in iterContainer must be within the range [first, last) |
| 49 |
> |
* @note first and last must be random access iterators and iterContainer must be the container of |
| 50 |
> |
* random access iterators . And all of the iteratos in iterContainer must be within the range [first, last) |
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* |
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* @code |
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* std::vector<int> iv; |
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* //1 |
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* //8 |
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* //1 8 |
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+ |
* @endcode |
| 68 |
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*/ |
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template<class RandomAccessIterator, template<typename ELEM, typename = std::allocator<ELEM> > class IteratorContainer> |
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bool next_combination(IteratorContainer<RandomAccessIterator>& iterContainer, RandomAccessIterator first, RandomAccessIterator last) { |
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iterContainer.insert(iterContainer.end(), first); |
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return true; |
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} else if (*(--i) != endIter){ |
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< |
//if the last iterator in iterContainer does not reaches the end, just increment it |
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> |
//if the last iterator in iterContainer does not reaches the end, just increase its iterator by 1 |
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++(*i); |
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return true; |
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} else {// the last iterator in iterContainer does not reaches the end |
| 87 |
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|
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//starts at the end of the sequence and works its way towards the front, looking for two |
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//consecutive members of the sequence where the difference between them is greater |
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< |
//than one. For example , if the sequence contains 1, 5, 8, 9 (total number is 10, begin |
| 91 |
< |
//index is 0, therefore 9 is the end index, and the current size is 4). At the end of while |
| 90 |
> |
//than one. For example , if the sequence contains 1, 5, 8, 9 (total number is 10, first is 0 |
| 91 |
> |
//and the last is 10 (due to STL's half open range)). At the end of while |
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//loop, j will point to 5, and i will point to 8, next combination should be 1, 6, 7, 8. |
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//If j is less than zero, it means it already reaches the last combination of current size. |
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//For instance, sequence may contain 6, 7, 8, 9 at this time, we need to increase the size |
| 130 |
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} |
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} //end next_combination |
| 132 |
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|
| 131 |
– |
bool replaceWildCard(std::vector<std::vector<std::string>::iterator>& cont, |
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– |
std::vector<std::string>& sequence, std::vector<std::string>& result, |
| 133 |
– |
const std::string& wildCard = "X") { |
| 134 |
– |
if (cont.size() > sequence.size()) { |
| 135 |
– |
std::cerr << "the size of iterator container is greater than the size of sequence"; |
| 136 |
– |
} |
| 137 |
– |
|
| 138 |
– |
bool hasMoreCombination = next_combination(cont, sequence.begin(), sequence.end()); |
| 139 |
– |
if (hasMoreCombination) { |
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– |
result.clear(); |
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– |
result.insert(result.begin(), sequence.size(), wildCard); |
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– |
std::vector<std::vector<std::string>::iterator>::iterator i; |
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– |
for ( i = cont.begin(); i != cont.end(); i++){ |
| 144 |
– |
result[*i - sequence.begin()] = **i; |
| 145 |
– |
} |
| 146 |
– |
} |
| 147 |
– |
|
| 148 |
– |
return hasMoreCombination; |
| 149 |
– |
|
| 150 |
– |
} |
| 151 |
– |
|
| 133 |
|
} //end namespace oopse |
| 134 |
|
#endif //UTILS_NEXT_COMBINATION_HPP |
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|
