sw_maker.H

#ifndef _SW_MAKER_H_
#define _SW_MAKER_H_

#include "exp_classes.H"
#include "ftwo.H"
#include "my_gmp.H"
#include "repring.H"
#include "algebras.H"
using namespace std;


class SW_Maker : public Exponentiator<F_2> {
private:
  //silly thing to extract "xx" from "toto(xx)"
  string name_of_rep(const string& name_chern);
  //silly thing to extract i from "toto_i(xx)"
  long index_of_chern_class(const string& name_chern);
  // this returns n! / i!(n-i)! mod 2, even if n < 0.
  F_2 comb(long n, long i);//used in Wu's formula !

public:
  GradedAlgebra<F_2> *chern_ring;
  AbstractHomomorphism<F_2> chern_sw;
  void start(RealRepresentationRing *thesource, 
             GradedAlgebra<F_2> *thetarget,
             GradedAlgebra<F_2> *the_chern_ring=0);

  virtual void create_regular_variables(string prefix);

  void add_complex_relations();

  AffineHomomorphism<F_2> translate_homomorphism(const AffineHomomorphism<QQ>& r,
                                                 SW_Maker& sw);
};



#endif

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