a_base.h

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/*
         Copyright 2012-2020 Pierre SMARS (smars@yuntech.edu.tw)
         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, see <http://www.gnu.org/licenses/>.
*/
#ifndef _VE_BASE_H_
#define _VE_BASE_H_
 
#include <iostream>
 
class a_base
{
        public:
                a_base() {verysmall_=1.e-12;}
                virtual const std::string classname() { return "a_base";}
                static const std::string help();
 
                //: input/output
                virtual void read(std::istream &i) {};
                virtual void write(std::ostream &o) const {};
                void read(const std::string &file_in);
                void write(const std::string &file_out) const;
                void small(double tol) {verysmall_=tol;}
                double small() const {return verysmall_;}
                friend   std::istream&  operator>> (std::istream& in, a_base& o);
                friend   std::ostream&  operator<< (std::ostream& out, const a_base& o);
                friend   std::istream&  operator>> (std::istream& in, a_base* o);
                friend   std::ostream&  operator<< (std::ostream& out, const a_base* o);
 
                class file_open_error {};
                class file_read_error {};
                class file_write_error {};
        protected:
                /*a small number used as a tolerance limit */
                double verysmall_;
};
 
#endif