GetAbs is a math code snippet to create a container with absoluted values of another container.


#include <algorithm>

#include <functional>

#include <vector>



//From http://www.richelbilderbeek.nl/CppMakeAbs.htm

template <typename T> struct Abs

  : public  std::unary_function<T,T>

{

  const T operator()(const T& x) const

    { return (x < static_cast<T>(0.0) ? -x : x); }

};



//From http://www.richelbilderbeek.nl/CppMakeAbs.htm

template <typename T>

void MakeAbs(std::vector<T>& v)

{

  std::transform(v.begin(),v.end(),v.begin(),Abs<T>());

}



//From http://www.richelbilderbeek.nl/CppGetAbs.htm

template <typename T>

const std::vector<T> GetAbs(

  const std::vector<T>& a)

{

  std::vector<T> v(a);

  MakeAbs(v);

  return v;

}

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(C++) GetAbs