libMesh::FEMFunctionBase< Output > Class Template Reference

FEMFunctionBase is a base class from which users can derive in order to define "function-like" objects that can be used within FEMSystem. More...

#include <dirichlet_boundaries.h>

Inheritance diagram for libMesh::FEMFunctionBase< Output >:

Public Member Functions
	FEMFunctionBase (FEMFunctionBase &&)=default
	The 5 special functions can be defaulted for this class. More...
	FEMFunctionBase (const FEMFunctionBase &)=default
FEMFunctionBase &	operator= (const FEMFunctionBase &)=default
FEMFunctionBase &	operator= (FEMFunctionBase &&)=default
virtual	~FEMFunctionBase ()=default
virtual void	init ()
	Any post-construction initialization. More...
virtual void	init_context (const FEMContext &)
	Prepares a context object for use. More...
virtual std::unique_ptr< FEMFunctionBase< Output > >	clone () const =0
virtual Output	operator() (const FEMContext &, const Point &p, const Real time=0.)=0
void	operator() (const FEMContext &, const Point &p, DenseVector< Output > &output)
	Evaluation function for time-independent vector-valued functions. More...
virtual void	operator() (const FEMContext &, const Point &p, const Real time, DenseVector< Output > &output)=0
	Evaluation function for time-dependent vector-valued functions. More...
virtual Output	component (const FEMContext &, unsigned int i, const Point &p, Real time=0.)

Protected Member Functions
	FEMFunctionBase ()=default
	Constructor. More...

Detailed Description

template<typename Output = Number>
class libMesh::FEMFunctionBase< Output >

FEMFunctionBase is a base class from which users can derive in order to define "function-like" objects that can be used within FEMSystem.

Author

Roy Stogner

Date

2012

Definition at line 43 of file dirichlet_boundaries.h.

Constructor & Destructor Documentation

FEMFunctionBase() [1/3]

template<typename Output = Number>

libMesh::FEMFunctionBase< Output >::FEMFunctionBase ( )

protecteddefault

Constructor.

FEMFunctionBase() [2/3]

template<typename Output = Number>

libMesh::FEMFunctionBase< Output >::FEMFunctionBase ( FEMFunctionBase< Output > &&  )

default

The 5 special functions can be defaulted for this class.

FEMFunctionBase() [3/3]

template<typename Output = Number>

libMesh::FEMFunctionBase< Output >::FEMFunctionBase ( const FEMFunctionBase< Output > &  )

default

~FEMFunctionBase()

template<typename Output = Number>

virtual libMesh::FEMFunctionBase< Output >::~FEMFunctionBase ( )

virtualdefault

Member Function Documentation

clone()

template<typename Output = Number>

virtual std::unique_ptr<FEMFunctionBase<Output> > libMesh::FEMFunctionBase< Output >::clone ( ) const

pure virtual

Returns

A new copy of the function.

The new copy should be as "deep" as necessary to allow independent destruction and simultaneous evaluations of the copies in different threads.

Implemented in CoupledFEMFunctionsy, libMesh::CompositeFEMFunction< Output >, CoupledFEMFunctionsx, libMesh::WrappedFunctor< Output >, libMesh::ParsedFEMFunction< Output >, libMesh::ParsedFEMFunction< T >, libMesh::ConstFEMFunction< Output >, libMesh::FDMGradient< GradType >, and SlitFunc.

Referenced by libMesh::ExactSolution::attach_exact_deriv(), libMesh::ExactSolution::attach_exact_hessian(), libMesh::ExactSolution::attach_exact_value(), libMesh::CompositeFEMFunction< Output >::attach_subfunction(), libMesh::DirichletBoundary::DirichletBoundary(), and HilbertSystem::set_goal_func().

component()

template<typename Output >

Output libMesh::FEMFunctionBase< Output >::component ( const FEMContext &  context, unsigned int  i, const Point &  p, Real  time = 0.  )

inlinevirtual

Returns

The vector component i at coordinate p and time time.

Note

Subclasses aren't required to override this, since the default implementation is based on the full vector evaluation, which is often correct.

Subclasses are recommended to override this, since the default implementation is based on a vector evaluation, which is usually unnecessarily inefficient.

Reimplemented in libMesh::CompositeFEMFunction< Output >, libMesh::FDMGradient< GradType >, libMesh::WrappedFunctor< Output >, libMesh::ParsedFEMFunction< Output >, and libMesh::ParsedFEMFunction< T >.

Definition at line 137 of file fem_function_base.h.

Referenced by libMesh::System::project_vector().

{
  DenseVector<Output> outvec(i+1);
  (*this)(context, p, time, outvec);
  return outvec(i);
}

init()

template<typename Output = Number>

virtual void libMesh::FEMFunctionBase< Output >::init ( )

inlinevirtual

Any post-construction initialization.

Reimplemented in libMesh::WrappedFunctor< Output >.

Definition at line 69 of file fem_function_base.h.

{}

init_context()

template<typename Output = Number>

virtual void libMesh::FEMFunctionBase< Output >::init_context ( const FEMContext &  )

inlinevirtual

Prepares a context object for use.

Most problems will want to reimplement this for efficiency, in order to call FE::get_*() as their particular function requires.

Reimplemented in libMesh::WrappedFunctor< Output >, libMesh::ParsedFEMFunction< Output >, libMesh::ParsedFEMFunction< T >, libMesh::FDMGradient< GradType >, and SlitFunc.

Definition at line 77 of file fem_function_base.h.

{}

operator()() [1/3]

template<typename Output = Number>

virtual Output libMesh::FEMFunctionBase< Output >::operator() ( const FEMContext &  , const Point &  p, const Real  time = 0.  )

pure virtual

Returns

The scalar function value at coordinate p and time time, which defaults to zero.

Pure virtual, so you have to override it.

Implemented in CoupledFEMFunctionsy, CoupledFEMFunctionsx, libMesh::CompositeFEMFunction< Output >, libMesh::WrappedFunctor< Output >, libMesh::ParsedFEMFunction< Output >, libMesh::ParsedFEMFunction< T >, libMesh::ConstFEMFunction< Output >, libMesh::FDMGradient< GradType >, and SlitFunc.

operator()() [2/3]

template<typename Output >

void libMesh::FEMFunctionBase< Output >::operator() ( const FEMContext &  context, const Point &  p, DenseVector< Output > &  output  )

inline

Evaluation function for time-independent vector-valued functions.

Sets output values in the passed-in output DenseVector.

Definition at line 149 of file fem_function_base.h.

{
  // Call the time-dependent function with t=0.
  this->operator()(context, p, 0., output);
}

operator()() [3/3]

template<typename Output = Number>

virtual void libMesh::FEMFunctionBase< Output >::operator() ( const FEMContext &  , const Point &  p, const Real  time, DenseVector< Output > &  output  )

pure virtual

Evaluation function for time-dependent vector-valued functions.

Sets output values in the passed-in output DenseVector.

Pure virtual, so you have to override it.

Implemented in libMesh::CompositeFEMFunction< Output >, libMesh::WrappedFunctor< Output >, libMesh::ParsedFEMFunction< Output >, libMesh::FDMGradient< GradType >, and libMesh::ConstFEMFunction< Output >.

operator=() [1/2]

template<typename Output = Number>

FEMFunctionBase& libMesh::FEMFunctionBase< Output >::operator= ( const FEMFunctionBase< Output > &  )

default

operator=() [2/2]

template<typename Output = Number>

FEMFunctionBase& libMesh::FEMFunctionBase< Output >::operator= ( FEMFunctionBase< Output > &&  )

default

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

• include/base/dirichlet_boundaries.h
• include/numerics/fem_function_base.h