constant.h

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/*
 *  GiNaC Copyright (C) 1999-2026 Johannes Gutenberg University Mainz, Germany
 *
 *  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 <https://www.gnu.org/licenses/>.
 */
 
#ifndef GINAC_CONSTANT_H
#define GINAC_CONSTANT_H
 
#include "basic.h"
#include "ex.h"
#include "archive.h"
 
#include <string>
 
namespace GiNaC {
 
typedef ex (*evalffunctype)();
    
class constant : public basic
{
    GINAC_DECLARE_REGISTERED_CLASS(constant, basic)
    // other constructors
public:
    constant(const std::string & initname, evalffunctype efun = nullptr, const std::string & texname = std::string(), unsigned domain = domain::complex);
    constant(const std::string & initname, const numeric & initnumber, const std::string & texname = std::string(), unsigned domain = domain::complex);
    
    // functions overriding virtual functions from base classes
public:
    bool info(unsigned inf) const override;
    ex evalf() const override;
    bool is_polynomial(const ex & var) const override;
    ex conjugate() const override;
    ex real_part() const override;
    ex imag_part() const override;
    void archive(archive_node& n) const override;
    void read_archive(const archive_node& n, lst& syms) override;
protected:
    ex derivative(const symbol & s) const override;
    bool is_equal_same_type(const basic & other) const override;
    unsigned calchash() const override;
    
    // non-virtual functions in this class
public:
    std::string get_name() const { return name; }
    std::string get_TeX_name() const { return TeX_name; }
protected:
    void do_print(const print_context & c, unsigned level) const;
    void do_print_tree(const print_tree & c, unsigned level) const;
    void do_print_latex(const print_latex & c, unsigned level) const;
    void do_print_python_repr(const print_python_repr & c, unsigned level) const;
 
// member variables
private:
    std::string name;     
    std::string TeX_name; 
    evalffunctype ef;
    ex number;            
    unsigned serial;      
    static unsigned next_serial;
    unsigned domain;      
};
GINAC_DECLARE_UNARCHIVER(constant); 
 
extern const constant Pi;
extern const constant Catalan;
extern const constant Euler;
 
} // namespace GiNaC
 
#endif // ndef GINAC_CONSTANT_H