/** @file add.h
 *
 *  Interface to GiNaC's sums of expressions. */

#ifndef _ADD_H_
#define _ADD_H_

#include "expairseq.h"

/** Sum of expressions. */
class add : public expairseq
{
    friend class mul;
    friend class ncmul;
    friend class power;

// member functions

    // default constructor, destructor, copy constructor assignment operator and helpers
public:
    add();
    ~add();
    add(add const & other);
    add const & operator=(add const & other);
protected:
    void copy(add const & other);
    void destroy(bool call_parent);

    // other constructors
public:
    add(ex const & lh, ex const & rh);
    add(exvector const & v);
    add(epvector const & v);
    //add(epvector const & v, bool do_not_canonicalize=0);
    add(epvector const & v, ex const & oc);
    add(epvector * vp, ex const & oc);

    // functions overriding virtual functions from bases classes
public:
    basic * duplicate() const;
    void printraw(ostream & os) const;
    void print(ostream & os, unsigned upper_precedence=0) const;
    void printcsrc(ostream & os, unsigned type, unsigned upper_precedence=0) const;
    bool info(unsigned inf) const;
    int degree(symbol const & s) const;
    int ldegree(symbol const & s) const;
    ex coeff(symbol const & s, int const n=1) const;
    ex eval(int level=0) const;
    ex diff(symbol const & s) const;
    ex series(symbol const & s, ex const & point, int order) const;
    ex normal(lst &sym_lst, lst &repl_lst, int level=0) const;
    numeric integer_content(void) const;
    ex smod(numeric const &xi) const;
    numeric max_coefficient(void) const;
    exvector get_indices(void) const;
    ex simplify_ncmul(exvector const & v) const;
protected:
    int compare_same_type(basic const & other) const;
    bool is_equal_same_type(basic const & other) const;
    unsigned return_type(void) const;
    unsigned return_type_tinfo(void) const;
    ex thisexpairseq(epvector const & v, ex const & oc) const;
    ex thisexpairseq(epvector * vp, ex const & oc) const;
    void printpair(ostream & os, expair const & p,
                   unsigned upper_precedence) const;
    expair split_ex_to_pair(ex const & e) const;
    expair combine_ex_with_coeff_to_pair(ex const & e,
                                         ex const & c) const;
    expair combine_pair_with_coeff_to_pair(expair const & p,
                                           ex const & c) const;
    ex recombine_pair_to_ex(expair const & p) const;
    ex expand(unsigned options=0) const;
    
    // new virtual functions which can be overridden by derived classes
    // none
    
    // non-virtual functions in this class
    // none

// member variables

protected:
    static unsigned precedence;
};

// global constants

extern const add some_add;
extern type_info const & typeid_add;

#define ex_to_add(X) static_cast<add const &>(*(X).bp)

#endif // ndef _ADD_H_