transform_if.h

// Copyright © 2018, 2024 Ivan Pizhenko. All rights reserved.
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#ifndef TRANSFORM_IF_H__
#define TRANSFORM_IF_H__

namespace stdx {

template< class InputIt, class OutputIt, class UnaryOperation, class UnaryPredicate>
OutputIt transform_if(
  InputIt first, InputIt last, OutputIt d_first,
  UnaryOperation unary_op, UnaryPredicate pred)
{
  for (; first != last; ++first) {
    if (pred(*first)) {
      *d_first = unary_op(*first);
      ++d_first; 
    }
  }
  return d_first;
}

} // namespace stdx

#endif // TRANSFORM_IF_H__