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%2Fnullptr.html | 59 --------------------------------------- 1 file changed, 59 deletions(-) delete mode 100644 devdocs/c/language%2Fnullptr.html (limited to 'devdocs/c/language%2Fnullptr.html') diff --git a/devdocs/c/language%2Fnullptr.html b/devdocs/c/language%2Fnullptr.html deleted file mode 100644 index 9c5d8a87..00000000 --- a/devdocs/c/language%2Fnullptr.html +++ /dev/null @@ -1,59 +0,0 @@ -

Predefined null pointer constant (since C23) -

Syntax

- -
nullptr (since C23)

Explanation

The keyword nullptr denotes a predefined null pointer constant. It is a non-lvalue of type nullptr_t. nullptr can be converted to a pointer types or bool, where the result is the null pointer value of that type or false respectively.

-

Keywords

nullptr

-

Example

-

Demonstrates that a copy of nullptr can also be used as a null pointer constant.

-
#include <stddef.h>
-#include <stdio.h>
- 
-void g(int*)
-{
-    puts("Function g called");
-}
- 
-#define DETECT_NULL_POINTER_CONSTANT(e) \
-    _Generic(e,                         \
-        void* : puts("void*"),          \
-        nullptr_t : puts("nullptr_t"),  \
-        default : puts("integer")       \
-    )
- 
-int main()
-{
-    g(nullptr); // OK
-    g(NULL); // OK
-    g(0); // OK
- 
-    auto cloned_nullptr = nullptr;
-    g(cloned_nullptr); // OK
- 
-    [[maybe_unused]] auto cloned_NULL = NULL;
-//  g(cloned_NULL); // implementation-defined: maybe OK
- 
-    [[maybe_unused]] auto cloned_zero = 0;
-//  g(cloned_zero); // Error
- 
-    DETECT_NULL_POINTER_CONSTANT(((void*)0));
-    DETECT_NULL_POINTER_CONSTANT(0);
-    DETECT_NULL_POINTER_CONSTANT(nullptr);
-    DETECT_NULL_POINTER_CONSTANT(NULL); // implementation-defined
-}

Possible output:

-
Function g called
-Function g called
-Function g called
-Function g called
-void*
-integer
-nullptr_t
-void*

See also

- - -
implementation-defined null pointer constant
(macro constant)
-
(C23)
 the type of the predefined null pointer constant nullptr
(typedef)
C++ documentation for nullptr
-

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

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