1 files changed, 32 insertions, 0 deletions
diff --git a/lib/heap.h b/lib/heap.h
new file mode 100644
index 0000000..895c375
--- /dev/null
+++ b/lib/heap.h
@@ -0,0 +1,32 @@
+/* Barebones heap implementation supporting only insert and pop.
+
+   Copyright (C) 2010-2022 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 <https://www.gnu.org/licenses/>.  */
+
+/* Full implementation: GDSL (http://gna.org/projects/gdsl/) by Nicolas
+   Darnis <ndarnis@free.fr>. Adapted by Gene Auyeung. */
+
+#include <stddef.h>
+
+struct heap;
+
+void heap_free (struct heap *) _GL_ATTRIBUTE_NONNULL ();
+
+struct heap *heap_alloc (int (*) (void const *, void const *), size_t)
+  _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC (heap_free, 1)
+  _GL_ATTRIBUTE_RETURNS_NONNULL;
+
+int heap_insert (struct heap *heap, void *item) _GL_ATTRIBUTE_NONNULL ();
+void *heap_remove_top (struct heap *heap) _GL_ATTRIBUTE_NONNULL ();