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  1. #include <boost/numeric/ublas/vector.hpp>
  2. #include <iomanip>
  3. #include <stdio.h>
  4.  
  5. namespace ublas = boost::numeric::ublas;
  6.  
  7. template <class T> class Vector
  8. {
  9.     private:
  10.  
  11.        ublas::vector<T> m_ublas_vec;
  12.        unsigned m_size;
  13.  
  14.     public:
  15.  
  16.        Vector(unsigned s){
  17.           m_size = s;
  18.           m_ublas_vec.resize(m_size);
  19.        }
  20.  
  21.        T &operator () (unsigned idx) {
  22.           if(idx >= m_size){
  23.              perror("ERROR: Index out of bounds!\n");
  24.              exit(1);
  25.           }
  26.        }
  27.  
  28.        // Right-multiply by scalar.
  29.        template <class TT, class S>
  30.        friend Vector<TT> operator * (const Vector<TT> &, S);
  31.  
  32.        // Left multiply by scalar.
  33.        template <class TT, class S>
  34.        friend Vector<TT> operator * (S, const Vector<TT> &);
  35. };
  36.  
  37. template <class T, class S>
  38. Vector<T> operator * (const Vector<T> &v_in, S scalar){
  39.    Vector<T> v_out (v_in.m_size);
  40.    v_out.m_ublas_vec = v_in.m_ublas_vec*static_cast<T>(scalar);
  41.    return v_out;
  42. }
  43.  
  44. template <class T, class S>
  45. Vector<T> operator * (S scalar, const Vector<T> &v_in){
  46.    Vector<T> v_out (v_in.m_size);
  47.    v_out.m_ublas_vec = v_in.m_ublas_vec*static_cast<T>(scalar);
  48.    return v_out;
  49. }
  50.  
  51. int main()
  52. {
  53.     Vector<int> ss(4);
  54.     ss*2;
  55.     return 0;
  56. }
Success #stdin #stdout 0.01s 2812KB
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https://ideone.com/8n9UO1
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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