amrex::FFT::R2X< T > Class Template Reference

Discrete Fourier Transform. More...

#include <AMReX_FFT_R2X.H>

Public Types
using	MF = std::conditional_t< std::is_same_v< T, Real >, MultiFab, FabArray< BaseFab< T > > >
using	cMF = FabArray< BaseFab< GpuComplex< T > > >

Public Member Functions
	R2X (Box const &domain, Array< std::pair< Boundary, Boundary >, 3 > const &bc, Info const &info=Info{})
	Build an FFT plan for the given domain and boundary types.
	~R2X ()
	Destroy any FFT resources held by this object.
	R2X (R2X const &)=delete
	R2X (R2X &&)=delete
R2X &	operator= (R2X const &)=delete
R2X &	operator= (R2X &&)=delete
T	scalingFactor () const
	Normalization applied after a forward/backward sequence.
template<typename F >
void	forwardThenBackward (MF const &inmf, MF &outmf, F const &post_forward)
	Execute forward transform, apply post_forward, then backward transform.
template<int dim, typename FAB , typename F >
void	post_forward_doit (FAB *fab, F const &f)
	Apply a user functor to a FAB after the forward transform along dimension dim.
template<typename F >
void	forwardThenBackward_doit_0 (MF const &inmf, MF &outmf, F const &post_forward, IntVect const &ngout=IntVect(0), Periodicity const &period=Periodicity::NonPeriodic())
	CUDA-visible helper that performs the forward/modify/backward cycle.
template<typename F >
void	forwardThenBackward_doit_1 (MF const &inmf, MF &outmf, F const &post_forward, IntVect const &ngout=IntVect(0), Periodicity const &period=Periodicity::NonPeriodic())
	CUDA-visible helper that operates on the complex FAB path.

Friends
template<typename U >
class	Poisson
template<typename U >
class	PoissonHybrid

Detailed Description

template<typename T = Real>
class amrex::FFT::R2X< T >

Discrete Fourier Transform.

This class supports Fourier transforms including cosine and sine transforms.

Member Typedef Documentation

cMF

template<typename T = Real>

using amrex::FFT::R2X< T >::cMF = FabArray<BaseFab<GpuComplex<T> > >

MF

template<typename T = Real>

using amrex::FFT::R2X< T >::MF = std::conditional_t<std::is_same_v<T,Real>, MultiFab, FabArray<BaseFab<T> > >

Constructor & Destructor Documentation

R2X() [1/3]

template<typename T >

amrex::FFT::R2X< T >::R2X	(	Box const &	domain,
		Array< std::pair< Boundary, Boundary >, 3 > const &	bc,
		Info const &	info = Info{}
	)

Build an FFT plan for the given domain and boundary types.

Parameters

domain	Cell- or node-centered domain describing the real data layout.
bc	Boundary pair for each direction (periodic/even/odd).
info	Optional tuning flags (domain strategy, batching, etc.).

~R2X()

template<typename T >

amrex::FFT::R2X< T >::~R2X

(

)

Destroy any FFT resources held by this object.

R2X() [2/3]

template<typename T = Real>

amrex::FFT::R2X< T >::R2X ( R2X< T > const &  )

delete

R2X() [3/3]

template<typename T = Real>

amrex::FFT::R2X< T >::R2X ( R2X< T > &&  )

delete

Member Function Documentation

forwardThenBackward()

template<typename T >

template<typename F >

void amrex::FFT::R2X< T >::forwardThenBackward	(	MF const &	inmf,
		MF &	outmf,
		F const &	post_forward
	)

Execute forward transform, apply post_forward, then backward transform.

Parameters

inmf	Input MultiFab (real space).
outmf	Output MultiFab (real space).
post_forward	Callable object.

forwardThenBackward_doit_0()

template<typename T >

template<typename F >

void amrex::FFT::R2X< T >::forwardThenBackward_doit_0	(	MF const &	inmf,
		MF &	outmf,
		F const &	post_forward,
		IntVect const &	ngout = IntVect(0),
		Periodicity const &	period = Periodicity::NonPeriodic()
	)

CUDA-visible helper that performs the forward/modify/backward cycle.

Parameters

inmf	Input MultiFab.
outmf	Output MultiFab.
post_forward	Spectral modifier functor.
ngout	Grow cells to fill on output.
period	Periodicity used for ghost exchange.

forwardThenBackward_doit_1()

template<typename T >

template<typename F >

void amrex::FFT::R2X< T >::forwardThenBackward_doit_1	(	MF const &	inmf,
		MF &	outmf,
		F const &	post_forward,
		IntVect const &	ngout = IntVect(0),
		Periodicity const &	period = Periodicity::NonPeriodic()
	)

CUDA-visible helper that operates on the complex FAB path.

Parameters

inmf	Input MultiFab.
outmf	Output MultiFab.
post_forward	Spectral modifier functor.
ngout	Grow cells to fill on output.
period	Periodicity used for ghost exchange.

operator=() [1/2]

template<typename T = Real>

R2X & amrex::FFT::R2X< T >::operator= ( R2X< T > &&  )

delete

operator=() [2/2]

template<typename T = Real>

R2X & amrex::FFT::R2X< T >::operator= ( R2X< T > const &  )

delete

post_forward_doit()

template<typename T >

template<int dim, typename FAB , typename F >

void amrex::FFT::R2X< T >::post_forward_doit	(	FAB *	fab,
		F const &	f
	)

Apply a user functor to a FAB after the forward transform along dimension dim.

Parameters

fab	Spectral FAB to mutate.
f	Callable object.

scalingFactor()

template<typename T >

T amrex::FFT::R2X< T >::scalingFactor

(

)

const

Normalization applied after a forward/backward sequence.

Returns

Reciprocal of the total number of real-space points.

Friends And Related Symbol Documentation

Poisson

template<typename T = Real>

template<typename U >

friend class Poisson

friend

PoissonHybrid

template<typename T = Real>

template<typename U >

friend class PoissonHybrid

friend

---

The documentation for this class was generated from the following file:

• /home/runner/work/amrex/amrex/Src/FFT/AMReX_FFT_R2X.H