---
description: "Learn more about the C26477 USE_NULLPTR_NOT_CONSTANT C++ Core Guidelines Checker warning. The nullptr value allows overloads with special null handling."
title: Warning C26477
ms.date: 04/29/2022
f1_keywords: ["C26477", "USE_NULLPTR_NOT_CONSTANT"]
helpviewer_keywords: ["C26477"]
ms.assetid: d5395efc-5eb2-4e82-9b45-fcd5ff4577bf
author: kylereedmsft
ms.author: kylereed
ms.custom: kr2b-contr-experiment
---
# Warning C26477

> Use '`nullptr`' rather than 0 or NULL (es.47)

## Remarks

`nullptr` has a special type `nullptr_t` that allows overloads with special null handling. Using `0` or `NULL` in place of `nullptr` bypasses the type safety and deduction that `nullptr` provides.

Code analysis name: `USE_NULLPTR_NOT_CONSTANT`

## See also

[C++ Core Guideline ES.47](https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Res-nullptr)