toptions.hh - pism - [fork] customized build of PISM, the parallel ice sheet model (tillflux branch)
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       toptions.hh (1602B)
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            1 /* Copyright (C) 2014, 2015 PISM Authors
            2  *
            3  * This file is part of PISM.
            4  *
            5  * PISM is free software; you can redistribute it and/or modify it under the
            6  * terms of the GNU General Public License as published by the Free Software
            7  * Foundation; either version 3 of the License, or (at your option) any later
            8  * version.
            9  *
           10  * PISM is distributed in the hope that it will be useful, but WITHOUT ANY
           11  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
           12  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
           13  * details.
           14  *
           15  * You should have received a copy of the GNU General Public License
           16  * along with PISM; if not, write to the Free Software
           17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
           18  */
           19 
           20 #ifndef _OPTIONS_H_
           21 #define _OPTIONS_H_
           22 
           23 namespace pism {
           24 namespace options {
           25 
           26 //! Template base class used by PISM's option-processing classes.
           27 /*! (Ensures API consistency and helps code reuse.)
           28  */
           29 template <typename T>
           30 class Option {
           31 public:
           32   Option() {
           33     m_is_set = false;
           34   }
           35   bool is_set() const {
           36     return m_is_set;
           37   }
           38   T value() const {
           39     return m_value;
           40   }
           41   operator T() const {
           42     return m_value;
           43   }
           44   const T* operator->() const {
           45     return &m_value;
           46   }
           47   T* operator->() {
           48     return &m_value;
           49   }
           50   bool operator==(const T& other) const {
           51     return m_value == other;
           52   }
           53 protected:
           54   T    m_value;
           55   bool m_is_set;
           56   void set(T new_value, bool new_flag) {
           57     m_value  = new_value;
           58     m_is_set = new_flag;
           59   }
           60 };
           61 
           62 } // end of namespace options
           63 } // end of namespace pism
           64 
           65 
           66 #endif /* _OPTIONS_H_ */