b-minmax.h

/* SPDX-License-Identifier: BSD-3-Clause */
/*
 * Copyright (c) 2018 NetApp, Inc. All rights reserved.
 *
 * See module.c for LICENSE details.
 *
 * min()/max() macros that also do
 * strict type-checking.. See the
 * "unnecessary" pointer comparison.
 */
#define ___PASTE(a, b) a##b
#define __PASTE(a, b) ___PASTE(a, b)

#ifndef __UNIQUE_ID
# define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __LINE__)
#endif

#define __min(t1, t2, min1, min2, x, y) ({		\
	t1 min1 = (x);					\
	t2 min2 = (y);					\
	(void) (&min1 == &min2);			\
	min1 < min2 ? min1 : min2; })
#define min(x, y)					\
	__min(typeof(x), typeof(y),			\
	      __UNIQUE_ID(min1_), __UNIQUE_ID(min2_),	\
	      x, y)

#define __max(t1, t2, max1, max2, x, y) ({		\
	t1 max1 = (x);					\
	t2 max2 = (y);					\
	(void) (&max1 == &max2);			\
	max1 > max2 ? max1 : max2; })
#define max(x, y)					\
	__max(typeof(x), typeof(y),			\
	      __UNIQUE_ID(max1_), __UNIQUE_ID(max2_),	\
	      x, y)

#define min_t(type, x, y)				\
	__min(type, type,				\
	      __UNIQUE_ID(min1_), __UNIQUE_ID(min2_),	\
	      x, y)

#define max_t(type, x, y)				\
	__max(type, type,				\
	      __UNIQUE_ID(min1_), __UNIQUE_ID(min2_),	\
	      x, y)