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+/* Run-time assert-like macros.
+
+ Copyright (C) 2014-2022 Free Software Foundation, Inc.
+
+ This file is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ This file 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 Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Paul Eggert. */
+
+#ifndef _GL_ASSURE_H
+#define _GL_ASSURE_H
+
+#include <assert.h>
+#include "verify.h"
+
+/* Evaluate an assertion E that is guaranteed to be true.
+ If NDEBUG is not defined, abort the program if E is false.
+ If NDEBUG is defined, the compiler can assume E and behavior is
+ undefined if E is false, fails to evaluate, or has side effects.
+
+ Unlike standard 'assert', this macro evaluates E even when NDEBUG
+ is defined, so as to catch typos, avoid some GCC warnings, and
+ improve performance when E is simple enough.
+
+ Also see the documentation for 'assume' in verify.h. */
+
+#ifdef NDEBUG
+# define affirm(E) assume (E)
+#else
+# define affirm(E) assert (E)
+#endif
+
+/* Check E's value at runtime, and report an error and abort if not.
+ However, do nothing if NDEBUG is defined.
+
+ Unlike standard 'assert', this macro compiles E even when NDEBUG
+ is defined, so as to catch typos and avoid some GCC warnings.
+ Unlike 'affirm', it is OK for E to use hard-to-optimize features,
+ since E is not executed if NDEBUG is defined. */
+
+#ifdef NDEBUG
+# define assure(E) ((void) (0 && (E)))
+#else
+# define assure(E) assert (E)
+#endif
+
+#endif