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+/* permutation/gsl_permutation.h
+ *
+ * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2004, 2007 Brian Gough
+ *
+ * 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 3 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GSL_PERMUTATION_H__
+#define __GSL_PERMUTATION_H__
+
+#include <stdlib.h>
+#include <gsl/gsl_types.h>
+#include <gsl/gsl_errno.h>
+#include <gsl/gsl_inline.h>
+#include <gsl/gsl_check_range.h>
+
+#undef __BEGIN_DECLS
+#undef __END_DECLS
+#ifdef __cplusplus
+# define __BEGIN_DECLS extern "C" {
+# define __END_DECLS }
+#else
+# define __BEGIN_DECLS /* empty */
+# define __END_DECLS /* empty */
+#endif
+
+__BEGIN_DECLS
+
+struct gsl_permutation_struct
+{
+ size_t size;
+ size_t *data;
+};
+
+typedef struct gsl_permutation_struct gsl_permutation;
+
+gsl_permutation *gsl_permutation_alloc (const size_t n);
+gsl_permutation *gsl_permutation_calloc (const size_t n);
+void gsl_permutation_init (gsl_permutation * p);
+void gsl_permutation_free (gsl_permutation * p);
+int gsl_permutation_memcpy (gsl_permutation * dest, const gsl_permutation * src);
+
+int gsl_permutation_fread (FILE * stream, gsl_permutation * p);
+int gsl_permutation_fwrite (FILE * stream, const gsl_permutation * p);
+int gsl_permutation_fscanf (FILE * stream, gsl_permutation * p);
+int gsl_permutation_fprintf (FILE * stream, const gsl_permutation * p, const char *format);
+
+size_t gsl_permutation_size (const gsl_permutation * p);
+size_t * gsl_permutation_data (const gsl_permutation * p);
+
+int gsl_permutation_swap (gsl_permutation * p, const size_t i, const size_t j);
+
+int gsl_permutation_valid (const gsl_permutation * p);
+void gsl_permutation_reverse (gsl_permutation * p);
+int gsl_permutation_inverse (gsl_permutation * inv, const gsl_permutation * p);
+int gsl_permutation_next (gsl_permutation * p);
+int gsl_permutation_prev (gsl_permutation * p);
+int gsl_permutation_mul (gsl_permutation * p, const gsl_permutation * pa, const gsl_permutation * pb);
+
+int gsl_permutation_linear_to_canonical (gsl_permutation * q, const gsl_permutation * p);
+int gsl_permutation_canonical_to_linear (gsl_permutation * p, const gsl_permutation * q);
+
+size_t gsl_permutation_inversions (const gsl_permutation * p);
+size_t gsl_permutation_linear_cycles (const gsl_permutation * p);
+size_t gsl_permutation_canonical_cycles (const gsl_permutation * q);
+
+INLINE_DECL size_t gsl_permutation_get (const gsl_permutation * p, const size_t i);
+
+#ifdef HAVE_INLINE
+
+INLINE_FUN
+size_t
+gsl_permutation_get (const gsl_permutation * p, const size_t i)
+{
+#if GSL_RANGE_CHECK
+ if (GSL_RANGE_COND(i >= p->size))
+ {
+ GSL_ERROR_VAL ("index out of range", GSL_EINVAL, 0);
+ }
+#endif
+ return p->data[i];
+}
+
+#endif /* HAVE_INLINE */
+
+__END_DECLS
+
+#endif /* __GSL_PERMUTATION_H__ */