/usr/include/root/Math/WrappedFunction.h is in libroot-math-mathcore-dev 5.34.14-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Authors: L. Moneta, A. Zsenei 08/2005
/**********************************************************************
* *
* Copyright (c) 2004 ROOT Foundation, CERN/PH-SFT *
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License *
* as published by the Free Software Foundation; either version 2 *
* of the License, or (at your option) any later version. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this library (see file COPYING); if not, write *
* to the Free Software Foundation, Inc., 59 Temple Place, Suite *
* 330, Boston, MA 02111-1307 USA, or contact the author. *
* *
**********************************************************************/
#ifndef ROOT_Math_WrappedFunction
#define ROOT_Math_WrappedFunction
#ifndef ROOT_Math_IFunction
#include "IFunction.h"
#endif
namespace ROOT {
namespace Math {
struct NullTypeFunc1D {};
typedef double(*FreeFunctionPtr)(double);
typedef double(*FreeMultiFunctionPtr)(const double*);
/**
Template class to wrap any C++ callable object which takes one argument
i.e. implementing operator() (double x) in a One-dimensional function interface.
It provides a ROOT::Math::IGenFunction-like signature
Note: If you want to wrap just the reference (to avoid copying) you need to use
Func& or const Func & as template parameter. The former should be used when the
operator() is not a const method of Func
@ingroup GenFunc
*/
template< typename Func = FreeFunctionPtr >
class WrappedFunction : public IGenFunction {
public:
/**
construct from the pointer to the object and the member function
*/
WrappedFunction( Func f ) :
fFunc( f )
{ /* no op */ }
// use default copy contructor and assignment operator
/// clone (required by the interface)
WrappedFunction * Clone() const {
return new WrappedFunction(fFunc);
}
// virtual ~WrappedFunction() { /**/ }
private:
virtual double DoEval (double x) const {
return fFunc( x );
}
Func fFunc;
}; // WrappedFunction
/**
Template class to wrap any member function of a class
taking a double and returning a double in a 1D function interface
For example, if you have a class like:
struct X {
double Eval(double x);
};
you can wrapped in the following way:
WrappedMemFunction<X, double ( X::* ) (double) > f;
@ingroup GenFunc
*/
template<typename FuncObj, typename MemFuncPtr >
class WrappedMemFunction : public IGenFunction {
public:
/**
construct from the pointer to the object and the member function
*/
WrappedMemFunction( FuncObj & obj, MemFuncPtr memFn ) :
fObj(&obj),
fMemFunc( memFn )
{ /* no op */ }
// use default copy contructor and assignment operator
/// clone (required by the interface)
WrappedMemFunction * Clone() const {
return new WrappedMemFunction(*fObj,fMemFunc);
}
private:
virtual double DoEval (double x) const {
return ((*fObj).*fMemFunc)( x );
}
FuncObj * fObj;
MemFuncPtr fMemFunc;
}; // WrappedMemFunction
/**
Template class to wrap any C++ callable object
implementing operator() (const double * x) in a multi-dimensional function interface.
It provides a ROOT::Math::IGenMultiFunction-like signature
Note: If you want to wrap just the reference (to avoid copying) you need to use
Func& or const Func & as template parameter. The former should be used when the
operator() is not a const method of Func
@ingroup GenFunc
*/
template< typename Func = FreeMultiFunctionPtr >
class WrappedMultiFunction : public IMultiGenFunction {
public:
/**
construct from the pointer to the object and the member function
*/
WrappedMultiFunction( Func f , unsigned int dim = 1) :
fFunc( f ),
fDim( dim)
{ /* no op */ }
// use default copy contructor and assignment operator
/// clone (required by the interface)
WrappedMultiFunction * Clone() const {
return new WrappedMultiFunction(fFunc,fDim);
}
unsigned int NDim() const { return fDim; }
// virtual ~WrappedFunction() { /**/ }
private:
virtual double DoEval (const double * x) const {
return fFunc( x );
}
Func fFunc;
unsigned int fDim;
}; // WrappedMultiFunction
template<typename FuncObj, typename MemFuncPtr >
class WrappedMemMultiFunction : public IMultiGenFunction {
public:
/**
construct from the pointer to the object and the member function
*/
WrappedMemMultiFunction( FuncObj & obj, MemFuncPtr memFn, unsigned int dim = 1 ) :
fObj(&obj),
fMemFunc( memFn ),
fDim(dim)
{ /* no op */ }
// use default copy contructor and assignment operator
/// clone (required by the interface)
WrappedMemMultiFunction * Clone() const {
return new WrappedMemMultiFunction(*fObj,fMemFunc,fDim);
}
unsigned int NDim() const { return fDim; }
private:
virtual double DoEval (const double * x) const {
return ((*fObj).*fMemFunc)( x );
}
FuncObj * fObj;
MemFuncPtr fMemFunc;
unsigned int fDim;
}; // WrappedMemMultiFunction
} // namespace Math
} // namespace ROOT
#endif // ROOT_Math_WrappedFunction
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