minus_Dg.hpp

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/* Unary minus operator. */
 
#pragma once
 
namespace FTensor
{
  template <class A, class T, int Dim01, int Dim2, char i, char j, char k>
  class minus_Dg
  {
    Dg_Expr<A, T, Dim01, Dim2, i, j, k> iterA;
 
  public:
    T operator()(const int N1, const int N2, const int N3) const
    {
      return -iterA(N1, N2, N3);
    }
 
    minus_Dg(const Dg_Expr<A, T, Dim01, Dim2, i, j, k> &a) : iterA(a) {}
  };
 
  template <class A, class T, int Dim01, int Dim2, char i, char j, char k>
  Dg_Expr<minus_Dg<A, T, Dim01, Dim2, i, j, k>, T, Dim01, Dim2, i, j, k>
  operator-(const Dg_Expr<A, T, Dim01, Dim2, i, j, k> &a)
  {
    using TensorExpr = minus_Dg<A, T, Dim01, Dim2, i, j, k>;
    return Dg_Expr<TensorExpr, T, Dim01, Dim2, i, j, k>(TensorExpr(a));
  }
}