No thrust (#629)

* remove thrust from warpx

* add in header for std::complex

1 files changed, 1 insertions, 6 deletions

diff --git a/Source/FieldSolver/SpectralSolver/SpectralKSpace.cpp b/Source/FieldSolver/SpectralSolver/SpectralKSpace.cpp
index aee131324..c21388aba 100644
--- a/Source/FieldSolver/SpectralSolver/SpectralKSpace.cpp
+++ b/Source/FieldSolver/SpectralSolver/SpectralKSpace.cpp
@@ -144,12 +144,7 @@ SpectralKSpace::getSpectralShiftFactor( const DistributionMapping& dm,
         }
         const Complex I{0,1};
         for (int i=0; i<k.size(); i++ ){
-#ifdef AMREX_USE_GPU
-            shift[i] = thrust::exp( I*sign*k[i]*0.5*dx[i_dim] );
-#else
-            shift[i] = std::exp( I*sign*k[i]*0.5*dx[i_dim] );
-#endif
-
+            shift[i] = exp( I*sign*k[i]*0.5*dx[i_dim]);
         }
     }
     return shift_factor;