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diff --git a/gnulib/lib/allocator.h b/gnulib/lib/allocator.h
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+/* Memory allocators such as malloc+free.
+
+ Copyright (C) 2011 Free Software Foundation, Inc.
+
+ 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, see <http://www.gnu.org/licenses/>. */
+
+/* Written by Paul Eggert. */
+
+#ifndef _GL_ALLOCATOR_H
+#define _GL_ALLOCATOR_H
+
+#include <stddef.h>
+
+/* An object describing a memory allocator family. */
+
+struct allocator
+{
+ /* Do not use GCC attributes such as __attribute__ ((malloc)) with
+ the function types pointed at by these members, because these
+ attributes do not work with pointers to functions. See
+ <http://lists.gnu.org/archive/html/bug-gnulib/2011-04/msg00007.html>. */
+
+ /* Call ALLOCATE to allocate memory, like 'malloc'. On failure ALLOCATE
+ should return NULL, though not necessarily set errno. When given
+ a zero size it may return NULL even if successful. */
+ void *(*allocate) (size_t);
+
+ /* If nonnull, call REALLOCATE to reallocate memory, like 'realloc'.
+ On failure REALLOCATE should return NULL, though not necessarily set
+ errno. When given a zero size it may return NULL even if
+ successful. */
+ void *(*reallocate) (void *, size_t);
+
+ /* Call FREE to free memory, like 'free'. */
+ void (*free) (void *);
+
+ /* If nonnull, call DIE (SIZE) if MALLOC (SIZE) or REALLOC (...,
+ SIZE) fails. DIE should not return. SIZE should equal SIZE_MAX
+ if size_t overflow was detected while calculating sizes to be
+ passed to MALLOC or REALLOC. */
+ void (*die) (size_t);
+};
+
+/* An allocator using the stdlib functions and a null DIE function. */
+extern struct allocator const stdlib_allocator;
+
+#endif /* _GL_ALLOCATOR_H */