mirror of https://gitlab.com/QEF/q-e.git
58 lines
1.8 KiB
Fortran
58 lines
1.8 KiB
Fortran
!
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! Copyright (C) Quantum ESPRESSO group
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!
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! This file is distributed under the terms of the
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! GNU General Public License. See the file `License'
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! in the root directory of the present distribution,
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! or http://www.gnu.org/copyleft/gpl.txt .
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!
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!=---------------------------------------------------------------------------=!
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MODULE fft_interfaces
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IMPLICIT NONE
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PRIVATE
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PUBLIC :: fwfft, invfft
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INTERFACE invfft
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!! invfft is the interface to both the standard fft **invfft_x**,
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!! and to the "box-grid" version **invfft_b**, used only in CP
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!! (the latter has an additional argument)
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SUBROUTINE invfft_x( grid_type, f, dfft, howmany )
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USE fft_types, ONLY: fft_type_descriptor
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USE fft_param, ONLY :DP
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IMPLICIT NONE
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CHARACTER(LEN=*), INTENT(IN) :: grid_type
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TYPE(fft_type_descriptor), INTENT(IN) :: dfft
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INTEGER, OPTIONAL, INTENT(IN) :: howmany
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COMPLEX(DP) :: f(:)
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END SUBROUTINE invfft_x
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!
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SUBROUTINE invfft_b( f, dfft, ia )
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USE fft_smallbox_type, ONLY: fft_box_descriptor
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USE fft_param, ONLY :DP
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IMPLICIT NONE
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INTEGER, INTENT(IN) :: ia
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TYPE(fft_box_descriptor), INTENT(IN) :: dfft
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COMPLEX(DP) :: f(:)
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END SUBROUTINE invfft_b
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END INTERFACE
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INTERFACE fwfft
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SUBROUTINE fwfft_x( grid_type, f, dfft, howmany )
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USE fft_types, ONLY: fft_type_descriptor
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USE fft_param, ONLY :DP
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IMPLICIT NONE
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CHARACTER(LEN=*), INTENT(IN) :: grid_type
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TYPE(fft_type_descriptor), INTENT(IN) :: dfft
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INTEGER, OPTIONAL, INTENT(IN) :: howmany
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COMPLEX(DP) :: f(:)
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END SUBROUTINE fwfft_x
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END INTERFACE
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END MODULE fft_interfaces
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!=---------------------------------------------------------------------------=!
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