source: trunk/lib/utility.h @ 9

//$Id: utility.h 7 2005-12-30 06:41:11Z jari $

#ifndef _theplu_svnstat_utility_
#define _theplu_svnstat_utility_

#include <algorithm>
#include <functional>
#include <utility>
#include <vector>

namespace theplu{
namespace svnstat{

  ///
  /// A resulting vector is calculated as sum of the value of arg 
  /// and vector sum_so_far. Each element in value of arg is added to the
  /// corresponded element in sum_so_far. The size of resulting vector is 
  /// equal to size of sum_so_far. For elements not having a corresponding 
  /// element in vector arg, the element in resulting vector is taken to  
  /// be equal to element in sum_so_far. 
  ///
  /// @return resulting vector
  /// @note if size of arg.second is larger than size of sum_so_far, the 
  /// result is undefined.
  ///
  template <class Key, class T >
    struct VectorPlus : 
  public std::binary_function< std::pair<const Key,std::vector<T> >, 
    std::vector<T>, std::vector<T> >
  {
    std::vector<T> operator()
      (std::vector<T>& sum_so_far,
       const std::pair<const Key, std::vector<T> >& arg) const 
    {
      std::vector<T> res(sum_so_far.size());
      transform(arg.second.begin(),arg.second.end(),sum_so_far.begin(),
    res.begin(), std::plus<T>());
      if (sum_so_far.size() > arg.second.size())
  copy(sum_so_far.begin()+arg.second.size(),sum_so_far.end(),
       res.begin()+arg.second.size());
      return res;
    }

  };
}}

#endif // end of namespace svnstat end of namespace theplu