/usr/include/madness/misc/phandler.h is in libmadness-dev 0.10-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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This file is part of MADNESS.
Copyright (C) 2007,2010 Oak Ridge National Laboratory
This program 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 program 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 program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
For more information please contact:
Robert J. Harrison
Oak Ridge National Laboratory
One Bethel Valley Road
P.O. Box 2008, MS-6367
email: harrisonrj@ornl.gov
tel: 865-241-3937
fax: 865-572-0680
*/
#ifndef MADNESS_MISC_PHANDLER_H__INCLUDED
#define MADNESS_MISC_PHANDLER_H__INCLUDED
/// \file misc/phandler.h
/// \brief Interface for the muParser library for turning user-defined functions into bytecode.
/* Example:
#include <madness/misc/phandler.h>
typedef FunctionFactory<double,3> factoryT;
typedef std::shared_ptr< FunctionFunctorInterface<double, 3> > functorT;
Function<double,3> pFunc = factoryT(world).functor(functorT(
new ParserHandler<double,3>("exp(-abs(r))")));
pfunc.compress();
...
*/
#include <madness/external/muParser/muParser.h>
#include <string>
#include <madness/mra/mra.h>
//using namespace madness;
//using namespace mu;
// T can be double or complex, but muParser results will always be real
// NDIM can be 1 to 6
// Varables allowed in strings are x,y,z,u,v,w, and r
// "r" will always mean magnitude of given vector
template <typename T, int NDIM>
class ParserHandler : public madness::FunctionFunctorInterface<T, NDIM> {
private:
mu::Parser parser; // the string-to-function parser
static const int MAX_DIM = 6;
mutable double vars[MAX_DIM]; // variables used in expression
mutable double r; // distance to origin
typedef madness::Vector<double, NDIM> coordT;
public:
ParserHandler(std::string expr) {
if (NDIM > MAX_DIM) MADNESS_EXCEPTION("too many dim for parser!",0);
try {
if (NDIM >= 1) parser.DefineVar("x", &vars[0]);
if (NDIM >= 2) parser.DefineVar("y", &vars[1]);
if (NDIM >= 3) parser.DefineVar("z", &vars[2]);
if (NDIM >= 4) parser.DefineVar("u", &vars[3]);
if (NDIM >= 5) parser.DefineVar("v", &vars[4]);
if (NDIM >= 6) parser.DefineVar("w", &vars[5]);
parser.DefineVar("r", &r);
parser.SetExpr(expr);
} catch (mu::Parser::exception_type &e) {
std::cout << "muParser: " << e.GetMsg() << std::endl;
}
}
virtual T operator() (const coordT &vals_in) const {
r = 0;
for (int i = 0; i < NDIM; ++i) {
vars[i] = vals_in[i];
r += vals_in[i]*vals_in[i];
}
r = sqrt(r);
try {
return parser.Eval();
} catch (mu::Parser::exception_type &e) {
std::cout << "muParser: " << e.GetMsg() << std::endl;
return 0.0;
}
} // end operator()
void changeExpr(const std::string newExpr) {
try {
parser.SetExpr(newExpr);
} catch (mu::Parser::exception_type &e) {
std::cout << "muParser: " << e.GetMsg() << std::endl;
}
}
}; // end class parserhandler
#endif // MADNESS_MISC_PHANDLER_H__INCLUDED
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