Pack.h

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// ========================================================================= //
// This file is part of MyraMath, copyright (c) 2014-2019 by Ryan A Chilton  //
// and distributed by MyraCore, LLC. See LICENSE.txt for license terms.      //
// ========================================================================= //

#ifndef MYRAMATH_UTILITY_PACK_H
#define MYRAMATH_UTILITY_PACK_H

#include <iostream>

namespace myra {

template<class T, int N> class Pack
  {
  public:

    Pack()
      { }

    const T* begin() const 
      { return data; }
    const T* end() const 
      { return data+N; }

    T* begin() 
      { return data; }
    T* end() 
      { return data+N; }

    const T& operator[] (int n) const
      { return data[n]; }
    T& operator[] (int n)
      { return data[n]; }

  private:

    // Internal contents.
    T data[N];
    
  };

template<class T, int N> std::ostream& operator<< (std::ostream& out, const Pack<T,N>& pack)
  { 
  out << "[ ";
  for (int n = 0; n < N; ++n)
    out << pack[n] << " ";
  out << "]";
  return out;
  }

template<class T> Pack<T,1> pack(const T& a)
  { 
  Pack<T,1> p; 
  p[0] = a; 
  return p; 
  }

template<class T> Pack<T,2> pack(const T& a, const T& b)
  { 
  Pack<T,2> p; 
  p[0] = a;
  p[1] = b;   
  return p; 
  }

template<class T> Pack<T,3> pack(const T& a, const T& b, const T& c)
  { 
  Pack<T,3> p; 
  p[0] = a;
  p[1] = b;
  p[2] = c;      
  return p; 
  }

template<class T> Pack<T,4> pack(const T& a, const T& b, const T& c, const T& d)
  { 
  Pack<T,4> p; 
  p[0] = a;
  p[1] = b;
  p[2] = c;
  p[3] = d;        
  return p; 
  }

template<class T> Pack<T,5> pack(const T& a, const T& b, const T& c, const T& d, const T& e)
  { 
  Pack<T,5> p; 
  p[0] = a;
  p[1] = b;
  p[2] = c;
  p[3] = d;
  p[4] = e;        
  return p; 
  }

template<class T> Pack<T,6> pack(const T& a, const T& b, const T& c, const T& d, const T& e, const T& f)
  { 
  Pack<T,6> p; 
  p[0] = a;
  p[1] = b;
  p[2] = c;
  p[3] = d;
  p[4] = e;
  p[5] = f;          
  return p; 
  }

} // namespace myra

#endif