From 82ba818ff456bcd6d56a06226e3f27e98fbb55c3 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Thu, 14 Aug 2025 22:58:58 -0500 Subject: removing all downloaded devdocs files --- devdocs/c/language%2F_alignof.html | 51 -------------------------------------- 1 file changed, 51 deletions(-) delete mode 100644 devdocs/c/language%2F_alignof.html (limited to 'devdocs/c/language%2F_alignof.html') diff --git a/devdocs/c/language%2F_alignof.html b/devdocs/c/language%2F_alignof.html deleted file mode 100644 index 1a478589..00000000 --- a/devdocs/c/language%2F_alignof.html +++ /dev/null @@ -1,51 +0,0 @@ -

_Alignof operator (since C11) -

Queries the alignment requirement of its operand type.

-

Syntax

- - -
_Alignof( type-name ) (since C11)
alignof( type-name ) (since C23)
- -

This operator is typically used through the convenience macro alignof, which is provided in the header <stdalign.h>

-		 (until C23)

Explanation

Returns the alignment requirement of the type named by type-name. If type-name is an array type, the result is the alignment requirement of the array element type. The type-name cannot be function type or an incomplete type.

-

The result is an integer constant of type size_t.

-

The operand is not evaluated (so external identifiers used in the operand do not have to be defined).

-

If type-name is a VLA type, its size expression is not evaluated.

-

Notes

The use of _Alignof(until C23)alignof(since C23) with expressions is allowed by some C compilers as a non-standard extension.

-

Keywords

alignof, _Alignof

-

Example

#include <stdalign.h>
-#include <stddef.h>
-#include <stdio.h>
- 
-int main(void)
-{
-    printf("Alignment of char = %zu\n", alignof(char));
-    printf("Alignment of max_align_t = %zu\n", alignof(max_align_t));
-    printf("alignof(float[10]) = %zu\n", alignof(float[10]));
-    printf("alignof(struct{char c; int n;}) = %zu\n",
-            alignof(struct {char c; int n;}));
-}

Possible output:

-
Alignment of char = 1
-Alignment of max_align_t = 16
-alignof(float[10]) = 4
-alignof(struct{char c; int n;}) = 4

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C standards.

- - - -
DR Applied to Behavior as published Correct behavior
-DR 494 C11 whether the size expression in a VLA is evaluated in _Alignof was unspecified it is unevaluated

References

See also

- - -
-
(C11)
 a type with alignment requirement as great as any other scalar type
(typedef)
_Alignas specifier(C11) sets alignment requirements of an object
C++ documentation for alignof operator
-

- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/language/_Alignof -

-
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