/* -*- mode: C -*-  */
/* 
   IGraph library.
   Copyright (C) 2007-2012  Gabor Csardi <csardi.gabor@gmail.com>
   334 Harvard street, Cambridge, MA 02139 USA
   
   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 2 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

*/

/**
 * Double ended queue data type.
 * \ingroup internal
 */

typedef struct TYPE(igraph_dqueue) {
  BASE *begin;
  BASE *end;
  BASE *stor_begin;
  BASE *stor_end;
} TYPE(igraph_dqueue);

int FUNCTION(igraph_dqueue,init)    (TYPE(igraph_dqueue)* q, long int size);
void FUNCTION(igraph_dqueue,destroy) (TYPE(igraph_dqueue)* q);
igraph_bool_t FUNCTION(igraph_dqueue,empty)   (const TYPE(igraph_dqueue)* q);
void FUNCTION(igraph_dqueue,clear)   (TYPE(igraph_dqueue)* q);
igraph_bool_t FUNCTION(igraph_dqueue,full)    (TYPE(igraph_dqueue)* q);
long int FUNCTION(igraph_dqueue,size)    (const TYPE(igraph_dqueue)* q);
BASE FUNCTION(igraph_dqueue,pop)     (TYPE(igraph_dqueue)* q);
BASE FUNCTION(igraph_dqueue,pop_back)(TYPE(igraph_dqueue)* q);
BASE FUNCTION(igraph_dqueue,head)    (const TYPE(igraph_dqueue)* q);
BASE FUNCTION(igraph_dqueue,back)    (const TYPE(igraph_dqueue)* q);
int FUNCTION(igraph_dqueue,push)    (TYPE(igraph_dqueue)* q, BASE elem);
int FUNCTION(igraph_dqueue,print)(const TYPE(igraph_dqueue)* q);
int FUNCTION(igraph_dqueue,fprint)(const TYPE(igraph_dqueue)* q, FILE *file);
BASE FUNCTION(igraph_dqueue,e)(const TYPE(igraph_dqueue) *q, long int idx);
