Tensor1_times_generic.hpp

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/* Multipliess a Tensor1 by a generic (or vice versa), yielding a Tensor1.
   Usually used for doubles, but could be used for complex, etc.  All
   that it requires is that you can add an element of the Tensor1 to
   it.  */
 
/* A(i) * d0 -> Tensor1 */
 
#pragma once
 
namespace FTensor
{
  template <class A, class T, class U, int Dim, char i>
  class Tensor1_times_generic
  {
    Tensor1_Expr<A, T, Dim, i> iterA;
    U d;
 
  public:
    typename promote<T, U>::V operator()(const int N) const
    {
      return iterA(N) * d;
    }
 
    Tensor1_times_generic(const Tensor1_Expr<A, T, Dim, i> &a, const U &d0)
        : iterA(a), d(d0)
    {}
  };
 
  template <class A, class T, class U, int Dim, char i>
  Tensor1_Expr<Tensor1_times_generic<A, T, U, Dim, i>,
               typename promote<T, U>::V, Dim, i>
  operator*(const Tensor1_Expr<A, T, Dim, i> &a, const U &d0)
  {
    using TensorExpr = Tensor1_times_generic<A, T, U, Dim, i>;
    return Tensor1_Expr<TensorExpr, typename promote<T, U>::V, Dim, i>(
      TensorExpr(a, d0));
  }
 
  /* d0 * A(i) -> Tensor1 */
 
  template <class A, class T, class U, int Dim, char i>
  Tensor1_Expr<Tensor1_times_generic<A, T, U, Dim, i>,
               typename promote<T, U>::V, Dim, i>
  operator*(const U &d0, const Tensor1_Expr<A, T, Dim, i> &a)
  {
    using TensorExpr = Tensor1_times_generic<A, T, U, Dim, i>;
    return Tensor1_Expr<TensorExpr, typename promote<T, U>::V, Dim, i>(
      TensorExpr(a, d0));
  }
}