ScalarFunctionCFunction.hpp

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//  This file is part of ff3d - http://www.freefem.org/ff3d
//  Copyright (C) 2001, 2002, 2003 Stéphane Del Pino

//  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, 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.  

//  $Id: ScalarFunctionCFunction.hpp,v 1.4 2007/02/26 01:12:21 delpinux Exp $

#ifndef SCALAR_FUNCTION_CFUNCTION_HPP
#define SCALAR_FUNCTION_CFUNCTION_HPP

#include <ScalarFunctionBase.hpp>
#include <iostream>
#include <string>

class ScalarFunctionCFunction
  : public ScalarFunctionBase
{
private:
  const std::string __cFunctionName; 
  ConstReferenceCounting<ScalarFunctionBase>
  __function;                   
  real_t (*__cfunction)(real_t x); 
  std::ostream& __put(std::ostream& os) const
  {
    os << __cFunctionName << '(' << *__function << ')';
    return os;
  }

public:
  real_t operator()(const TinyVector<3, real_t>& X) const
  {
    const ScalarFunctionBase& function = *__function;
    return __cfunction(function(X));
  }

  bool canBeSimplified() const
  {
    return false;
  }

  ScalarFunctionCFunction(const std::string& cfunction,
                          ConstReferenceCounting<ScalarFunctionBase> function)
    : ScalarFunctionBase(ScalarFunctionBase::cfunction),
      __cFunctionName(cfunction),
      __function(function)
  {
    if (__cFunctionName == "abs") {
      __cfunction = &std::abs;
      return;
    }
    if (__cFunctionName == "sin") {
      __cfunction = &std::sin;
      return;
    }
    if (__cFunctionName == "cos") {
      __cfunction = &std::cos;
      return;
    }
    if (__cFunctionName == "tan") {
      __cfunction = &std::tan;
      return;
    }
    if (__cFunctionName == "asin") {
      __cfunction = &std::asin;
      return;
    }
    if (__cFunctionName == "acos") {
      __cfunction = &std::acos;
      return;
    }
    if (__cFunctionName == "atan") {
      __cfunction = &std::atan;
      return;
    }
    if (__cFunctionName == "sqrt") {
      __cfunction = &std::sqrt;
      return;
    }
    if (__cFunctionName == "exp") {
      __cfunction = &std::exp;
      return;
    }
    if (__cFunctionName == "log") {
      __cfunction = &std::log;
      return;
    }
    throw ErrorHandler(__FILE__,__LINE__,
                       "not implemented",
                       ErrorHandler::unexpected);
  }

  ScalarFunctionCFunction(const ScalarFunctionCFunction& f)
    : ScalarFunctionBase(f),
      __cFunctionName(f.__cFunctionName),
      __function(f.__function),
      __cfunction(f.__cfunction)
  {
    ;
  }

  ~ScalarFunctionCFunction()
  {
    ;
  }
};

#endif // SCALAR_FUNCTION_CFUNCTION_HPP

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