source: git/factory/int_int.h @ 194f5e5

/* emacs edit mode for this file is -*- C++ -*- */
/* $Id: int_int.h,v 1.8 1998-03-17 15:56:18 schmidt Exp $ */

#ifndef INCL_INT_INT_H
#define INCL_INT_INT_H

#include <config.h>

#ifndef NOSTREAMIO
#include <iostream.h>
#endif /* NOSTREAMIO */

#include "assert.h"

#include "int_cf.h"
#include "cf_gmp.h"
#include "gmpext.h"

class InternalInteger : public InternalCF
{
private:
    MP_INT thempi;

    // auxilliary methods
    inline InternalCF * normalizeMyself ();
    inline InternalCF * uiNormalizeMyself ();

    static inline InternalCF * normalizeMPI ( MP_INT & );
    static inline InternalCF * uiNormalizeMPI ( MP_INT & );

    static inline MP_INT & MPI ( const InternalCF * const c );

public:
    InternalInteger();
    InternalInteger( const InternalCF& )
    {
        ASSERT( 0, "ups there is something wrong in your code" );
    }
    InternalInteger( const int i );
    InternalInteger( const char * str );
    InternalInteger( const MP_INT & );
    ~InternalInteger();
    InternalCF* deepCopyObject() const;
    const char * const classname() const { return "InternalInteger"; }
#ifndef NOSTREAMIO
    void print( ostream&, char* );
#endif /* NOSTREAMIO */
    bool isZero() const;
    bool isOne() const;
    InternalCF* genZero();
    InternalCF* genOne();

    bool is_imm() const;

    int levelcoeff() const { return IntegerDomain; }
    InternalCF* neg();

    int comparesame( InternalCF* );

    InternalCF* addsame( InternalCF* );
    InternalCF* subsame( InternalCF* );
    InternalCF* mulsame( InternalCF* );
    InternalCF* dividesame( InternalCF* );
    InternalCF* modulosame( InternalCF* );
    InternalCF* divsame( InternalCF* );
    InternalCF* modsame( InternalCF* );
    void divremsame( InternalCF*, InternalCF*&, InternalCF*& );
    bool divremsamet( InternalCF*, InternalCF*&, InternalCF*& );

    int comparecoeff( InternalCF* );

    InternalCF* addcoeff( InternalCF* );
    InternalCF* subcoeff( InternalCF*, bool );
    InternalCF* mulcoeff( InternalCF* );
    InternalCF* dividecoeff( InternalCF*, bool );
    InternalCF* modulocoeff( InternalCF*, bool );
    InternalCF* divcoeff( InternalCF*, bool );
    InternalCF* modcoeff( InternalCF*, bool );
    void divremcoeff( InternalCF*, InternalCF*&, InternalCF*&, bool );
    bool divremcoefft( InternalCF*, InternalCF*&, InternalCF*&, bool );

    InternalCF * bgcdsame ( const InternalCF * const ) const;
    InternalCF * bgcdcoeff ( const InternalCF * const );

    InternalCF * bextgcdsame ( InternalCF *, CanonicalForm &, CanonicalForm & );
    InternalCF * bextgcdcoeff ( InternalCF *, CanonicalForm &, CanonicalForm & );

    int intval() const;

    int intmod( int p ) const;

    int sign() const;

    InternalCF* sqrt();

    int ilog2();
    
    friend class InternalRational;
#ifdef SINGULAR
    friend MP_INT gmp_numerator ( const CanonicalForm & f );
    friend MP_INT gmp_denominator ( const CanonicalForm & f );
#endif /* SINGULAR */
    friend MP_INT getmpi ( InternalCF * value, bool symmetric );
};

//{{{ inline InternalCF * InternalInteger::normalizeMyself, uiNormalizeMyself ()
//{{{ docu
//
// normalizeMyself(), uiNormalizeMyself() - normalize CO.
//
// If CO fits into an immediate integer, delete CO and return the
// immediate.  Otherwise, return a pointer to CO.
//
// `uiNormalizeMyself()' is the same as `normalizeMyself()'
// except that CO is expected to be non-begative.  In this case,
// we may use `mpz_get_ui()' to convert the underlying mpi into
// an immediate which is slightly faster than the signed variant.
//
// Note: We do not mind reference counting at this point!  CO is
// deleted unconditionally!
//
//}}}
inline InternalCF *
InternalInteger::normalizeMyself ()
{
    ASSERT( getRefCount() == 1, "internal error: must not delete CO" );

    if ( mpz_is_imm( &thempi ) ) {
        InternalCF * result = int2imm( mpz_get_si( &thempi ) );
        delete this;
        return result;
    } else
        return this;
}

inline InternalCF *
InternalInteger::uiNormalizeMyself ()
{
    ASSERT( getRefCount() == 1, "internal error: must not delete CO" );

    if ( mpz_is_imm( &thempi ) ) {
        InternalCF * result = int2imm( mpz_get_ui( &thempi ) );
        delete this;
        return result;
    } else
        return this;
}
//}}}

//{{{ static inline InternalCF * InternalInteger::normalizeMPI, uiNormalizeMPI ( MP_INT & aMpi )
//{{{ docu
//
// normalizeMPI(), uiNormalizeMPI() - normalize a mpi.
//
// If `aMpi' fits into an immediate integer, clear `aMpi' and
// return the immediate.  Otherwise, return a new
// `InternalInteger' with `aMpi' as underlying mpi.
//
// `uiNormalizeMPI()' is the same as `normalizeMPI()' except that
// `aMpi' is expected to be non-begative.  In this case, we may
// use `mpz_get_ui()' to convert `aMpi' into an immediate which
// is slightly faster than the signed variant.
//
//}}}
inline InternalCF *
InternalInteger::normalizeMPI ( MP_INT & aMpi )
{
    if ( mpz_is_imm( &aMpi ) ) {
        InternalCF * result = int2imm( mpz_get_si( &aMpi ) );
        mpz_clear( &aMpi );
        return result;
    } else
        return new InternalInteger( aMpi );
}

inline InternalCF *
InternalInteger::uiNormalizeMPI ( MP_INT & aMpi )
{
    if ( mpz_is_imm( &aMpi ) ) {
        InternalCF * result = int2imm( mpz_get_ui( &aMpi ) );
        mpz_clear( &aMpi );
        return result;
    } else
        return new InternalInteger( aMpi );
}
//}}}

//{{{ inline MP_INT & InternalInteger::MPI ( const InternalCF * const c )
//{{{ docu
//
// MPI() - return underlying mpi of `c'.
//
// `c' is expected to be an `InternalInteger *'.  `c's underlying
// mpi is returned.
//
//}}}
inline MP_INT &
InternalInteger::MPI ( const InternalCF * const c )
{
    return (((InternalInteger*)c)->thempi);
}
//}}}

#endif /* ! INCL_INT_INT_H */