ml_algorithm/transform_if.hpp

#ifndef ML_ALGORITHM_TRANSFORM_IF_HPP
#define ML_ALGORITHM_TRANSFORM_IF_HPP

namespace ml_algorithm
{
        template< class InputIterator, class OutputIterator, class UnaryOperator, class Predicate >
        OutputIterator transform_if (InputIterator first1, InputIterator last1,
                        OutputIterator result, UnaryOperator op, Predicate pred)
        {
                while (first1 != last1) if(pred(*first1)) 
                        *results++ = op(*first++);
                return results;
        }

        template< class InputIterator, class OutputIterator, class UnaryOperator, class Predicate >
        OutputIterator transform_if (InputIterator first1, InputIterator last1,
                        InputIterator first2, InputIterator last2,
                        OutputIterator result, BinaryOperator op, Predicate pred)
        {
                while (first1 != last1) if(pred(*first1)) 
                        *results++ = op(*first++, *first2++);
                return results;
        }
}

#endif

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