---
description: "Learn more about the vtordisp pragma in Microsoft C++"
title: "vtordisp pragma"
ms.date: 01/22/2021
f1_keywords: ["vc-pragma.vtordisp", "vtordisp_CPP"]
helpviewer_keywords: ["pragma, vtordisp", "vtordisp pragma"]
no-loc: ["pragma"]
---
# `vtordisp` pragma

Controls the addition of the hidden `vtordisp` construction/destruction displacement member. The `vtordisp` pragma is C++-specific.

## Syntax

> **`#pragma vtordisp(`** [ **`push,`** ] *n* **`)`**\
> **`#pragma vtordisp(pop)`**\
> **`#pragma vtordisp()`**\
> **`#pragma vtordisp(`** [ **`push,`** ] { **`on`** | **`off`** } **`)`**

### Parameters

**`push`**\
Pushes the current `vtordisp` setting on the internal compiler stack, and sets the new `vtordisp` setting to *n*.  If *n* isn't specified, the current `vtordisp` setting is unchanged.

**`pop`**\
Removes the top record from the internal compiler stack, and restores the `vtordisp` setting to the removed value.

*n*\
Specifies the new value for the `vtordisp` setting. Possible values are **`0`**, **`1`**, or **`2`**, corresponding to the **`/vd0`**, **`/vd1`**, and **`/vd2`** compiler options. For more information, see [`/vd` (Disable Construction Displacements)](../build/reference/vd-disable-construction-displacements.md).

**`on`**\
Equivalent to `#pragma vtordisp(1)`.

**`off`**\
Equivalent to `#pragma vtordisp(0)`.

## Remarks

The **`vtordisp`** pragma is applicable only to code that uses virtual bases. If a derived class overrides a virtual function that it inherits from a virtual base class, and if a constructor or destructor for the derived class calls that function using a pointer to the virtual base class, the compiler might introduce extra hidden `vtordisp` fields into classes with virtual bases.

The **`vtordisp`** pragma affects the layout of classes that follow it. The **`/vd0`**, **`/vd1`**, and **`/vd2`** compiler options specify the same behavior for complete modules. Specifying **`0`** or **`off`** suppresses the hidden `vtordisp` members. Turn off **`vtordisp`** only if there's no possibility that the class's constructors and destructors call virtual functions on the object pointed to by the **`this`** pointer.

Specifying **`1`** or **`on`**, the default, enables the hidden `vtordisp` members where they're necessary.

Specifying **`2`** enables the hidden `vtordisp` members for all virtual bases with virtual functions. `#pragma vtordisp(2)` might be necessary to ensure correct performance of **`dynamic_cast`** on a partially constructed object. For more information, see [Compiler Warning (level 1) C4436](../error-messages/compiler-warnings/compiler-warning-level-1-c4436.md).

`#pragma vtordisp()`, with no arguments, restores the `vtordisp` setting to its initial setting.

```cpp
#pragma vtordisp(push, 2)
class GetReal : virtual public VBase { ... };
#pragma vtordisp(pop)
```

## See also

[Pragma directives and the `__pragma` and `_Pragma` keywords](./pragma-directives-and-the-pragma-keyword.md)