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-.\" Copyright (c) 2022 by Alejandro Colomar <alx@kernel.org>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH static_assert 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-static_assert, _Static_assert \- fail compilation if assertion is false
-.SH LIBRARY
-Standard C library
-.RI ( libc )
-.SH SYNOPSIS
-.nf
-.B #include <assert.h>
-.PP
-.BI "void static_assert(scalar " constant-expression ", const char *" msg );
-.PP
-/* Since C23: */
-.BI "void static_assert(scalar " constant-expression );
-.fi
-.SH DESCRIPTION
-This macro is similar to
-.BR \%assert (3),
-but it works at compile time,
-generating a compilation error (with an optional message)
-when the input is false (i.e., compares equal to zero).
-.PP
-If the input is nonzero,
-no code is emitted.
-.PP
-.I msg
-must be a string literal.
-Since C23, this argument is optional.
-.PP
-There's a keyword,
-.BR \%_Static_assert (),
-that behaves identically,
-and can be used without including
-.IR <assert.h> .
-.SH RETURN VALUE
-No value is returned.
-.SH VERSIONS
-In C11,
-the second argument
-.RI ( msg )
-was mandatory;
-since C23,
-it can be omitted.
-.SH STANDARDS
-C11 and later.
-.SH EXAMPLES
-.BR static_assert ()
-can't be used in some places,
-like for example at global scope.
-For that,
-a macro
-.BR \%must_be ()
-can be written in terms of
-.BR \%static_assert ().
-The following program uses the macro to get the size of an array safely.
-.PP
-.in +4n
-.\" SRC BEGIN (must_be.c)
-.EX
-#include <assert.h>
-#include <stddef.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-\&
-/*
- * This macro behaves like static_assert(), failing to
- * compile if its argument is not true.  However, it always
- * returns 0, which allows using it everywhere an expression
- * can be used.
- */
-#define must_be(e)                                        \e
-(                                                         \e
-    0 * (int) sizeof(                                     \e
-        struct {                                          \e
-            static_assert(e);                             \e
-            int  ISO_C_forbids_a_struct_with_no_members;  \e
-        }                                                 \e
-    )                                                     \e
-)
-\&
-#define is_same_type(a, b)  \e
-    __builtin_types_compatible_p(typeof(a), typeof(b))
-\&
-#define is_array(arr)       (!is_same_type((arr), &*(arr)))
-#define must_be_array(arr)  must_be(is_array(arr))
-\&
-#define sizeof_array(arr)   (sizeof(arr) + must_be_array(arr))
-#define nitems(arr)         (sizeof((arr)) / sizeof((arr)[0]) \e
-                             + must_be_array(arr))
-\&
-int     foo[10];
-int8_t  bar[sizeof_array(foo)];
-\&
-int
-main(void)
-{
-    for (size_t i = 0; i < nitems(foo); i++) {
-        foo[i] = i;
-    }
-\&
-    memcpy(bar, foo, sizeof_array(bar));
-\&
-    for (size_t i = 0; i < nitems(bar); i++) {
-        printf("%d,", bar[i]);
-    }
-\&
-    exit(EXIT_SUCCESS);
-}
-.EE
-.\" SRC END
-.in
-.SH SEE ALSO
-.BR assert (3)