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/usr/include/polylib/Lattice.h is in libpolylib64-dev 5.22.5-3+dfsgubuntu1.

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/*
    This file is part of PolyLib.

    PolyLib 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 3 of the License, or
    (at your option) any later version.

    PolyLib 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 PolyLib.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef _Lattice_h_
#define _Lattice_h_

#if defined(__cplusplus)
extern "C" {
#endif

extern void AffineHermite ( Lattice *A, Lattice **H, Matrix **U );
extern void AffineSmith ( Lattice *A, Lattice **U, Lattice **V, Lattice
                          **Diag );
extern Lattice *ChangeLatticeDimension ( Lattice *A, int dimension );
extern Lattice *EmptyLattice ( int dimension );
extern Lattice *ExtractLinearPart ( Lattice *A );
extern int FindHermiteBasisofDomain ( Polyhedron *A, Matrix **B );
extern Lattice *Homogenise ( Lattice *A, Bool Forward );
extern int intcompare ( const void *a, const void *b );
extern Bool isEmptyLattice ( Lattice *A );
extern Bool isfulldim ( Matrix *m );
extern Bool IsLattice ( Matrix *m );
extern Bool isLinear ( Lattice *A );
extern LatticeUnion *LatticeDifference ( Lattice *A, Lattice *B );
extern Lattice *LatticeImage ( Lattice *A, Matrix *M );
extern Bool LatticeIncludes ( Lattice *A, Lattice *B );
extern Lattice *LatticeIntersection ( Lattice *X, Lattice *Y );
extern Lattice *LatticePreimage ( Lattice *L, Matrix *G );
extern LatticeUnion *LatticeSimplify ( LatticeUnion *latlist );
extern LatticeUnion *LatticeUnion_Alloc ( void );
extern void LatticeUnion_Free ( LatticeUnion *Head );
extern void PrintLatticeUnion ( FILE *fp, char *format, LatticeUnion
                                *Head );
extern Bool sameAffinepart ( Lattice *A, Lattice *B );
extern Bool sameLattice ( Lattice *A, Lattice *B );
extern LatticeUnion *Lattice2LatticeUnion(Lattice *X,Lattice *Y);

#if defined(__cplusplus)
}
#endif

#endif /* _Lattice_h_ */