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/*
igraph library.
Copyright (C) 2007-2025 The igraph development team <igraph@igraph.org>
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, see <https://www.gnu.org/licenses/>.
*/
/**
* 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);
IGRAPH_EXPORT igraph_error_t FUNCTION(igraph_dqueue, init)(TYPE(igraph_dqueue)* q, igraph_int_t capacity);
IGRAPH_EXPORT void FUNCTION(igraph_dqueue, destroy)(TYPE(igraph_dqueue)* q);
IGRAPH_EXPORT IGRAPH_FUNCATTR_PURE igraph_bool_t FUNCTION(igraph_dqueue, empty)(const TYPE(igraph_dqueue)* q);
IGRAPH_EXPORT void FUNCTION(igraph_dqueue, clear)(TYPE(igraph_dqueue)* q);
IGRAPH_EXPORT IGRAPH_FUNCATTR_PURE igraph_bool_t FUNCTION(igraph_dqueue, full)(TYPE(igraph_dqueue)* q);
IGRAPH_EXPORT IGRAPH_FUNCATTR_PURE igraph_int_t FUNCTION(igraph_dqueue, size)(const TYPE(igraph_dqueue)* q);
IGRAPH_EXPORT BASE FUNCTION(igraph_dqueue, pop)(TYPE(igraph_dqueue)* q);
IGRAPH_EXPORT BASE FUNCTION(igraph_dqueue, pop_back)(TYPE(igraph_dqueue)* q);
IGRAPH_EXPORT IGRAPH_FUNCATTR_PURE BASE FUNCTION(igraph_dqueue, head)(const TYPE(igraph_dqueue)* q);
IGRAPH_EXPORT IGRAPH_FUNCATTR_PURE BASE FUNCTION(igraph_dqueue, back)(const TYPE(igraph_dqueue)* q);
IGRAPH_EXPORT igraph_error_t FUNCTION(igraph_dqueue, push)(TYPE(igraph_dqueue)* q, BASE elem);
IGRAPH_EXPORT igraph_error_t FUNCTION(igraph_dqueue, print)(const TYPE(igraph_dqueue)* q);
IGRAPH_EXPORT igraph_error_t FUNCTION(igraph_dqueue, fprint)(const TYPE(igraph_dqueue)* q, FILE *file);
IGRAPH_EXPORT BASE FUNCTION(igraph_dqueue, get)(const TYPE(igraph_dqueue) *q, igraph_int_t idx);
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