product_function.h

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//
// Copyright (c) 2015 by François Mauger <mauger@lpccaen.in2p3.fr>
//
// This file is part of Bayeux.
//
// Bayeux 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 3 of the License, or
// (at your option) any later version.
//
// Bayeux 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 Bayeux. If not, see <http://www.gnu.org/licenses/>.

#ifndef MYGSL_PRODUCT_FUNCTION_H
#define MYGSL_PRODUCT_FUNCTION_H

// This project:
#include <mygsl/i_unary_function.h>

namespace mygsl {


  class product_function : public i_unary_function
  {
  public:

    product_function();

    product_function(const i_unary_function & f_, const i_unary_function & g_);

    virtual ~product_function();

    virtual bool is_initialized() const;

    virtual void initialize(const datatools::properties & config_,
                            const unary_function_dict_type & functors_);

    void reset();

    void set_f(const i_unary_function &);

    void set_g(const i_unary_function &);

    bool has_f() const;

    bool has_g() const;

    /* virtual */ bool has_explicit_domain_of_definition() const;

    /* virtual */ bool is_in_domain_of_definition(double x_) const;

    /* virtual */ double get_non_zero_domain_min() const;

    /* virtual */ double get_non_zero_domain_max() const;

    virtual void tree_dump(std::ostream & out_ = std::clog,
                           const std::string & title_  = "",
                           const std::string & indent_ = "",
                           bool inherit_ = false) const;

  protected :

    double _eval(double x_) const;

  private:

    void _at_init();

  private:

    unary_function_handle _f_; 
    unary_function_handle _g_; 

    MYGSL_UNARY_FUNCTOR_REGISTRATION_INTERFACE(product_function)
  };

} // end of namespace mygsl

#endif // MYGSL_PRODUCT_FUNCTION_H

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