Tensor1_minus_generic.hpp

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/* Subtracts a Tensor1 from 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_minus_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_minus_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_minus_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_minus_generic<A, T, U, Dim, i>;
    return Tensor1_Expr<TensorExpr, typename promote<T, U>::V, Dim, i>(
      TensorExpr(a, d0));
  }
}