data-directives-and-operators-in-inline-assembly.md

description	Learn more about: Data Directives and Operators in Inline Assembly
title	Data Directives and Operators in Inline Assembly
ms.date	06/03/2022
helpviewer_keywords	data directives [C++] __asm keyword [C++], referencing limitations MASM (Microsoft Macro Assembler), directives directives [C++], MASM MASM (Microsoft Macro Assembler), structures operators [MASM] inline assembly, operators inline assembly, data directives MASM (Microsoft Macro Assembler), operators structures [C++], MASM
ms.assetid	fb7410c7-156a-4131-bcfc-211aa70533e3

Data directives and operators in inline assembly

Microsoft Specific

The inline assembler doesn't support all the data directives and operators available in MASM.

Remarks

Although an __asm block can reference C or C++ data types and objects, it can't define data objects with MASM directives or operators. Specifically, you can't use the definition directives DB, DW, DD, DQ, DT, and DF, or the operators DUP or THIS. MASM structures and records are also unavailable. The inline assembler doesn't accept the directives STRUC, RECORD, WIDTH, or MASK.

END Microsoft Specific

See also

Using Assembly Language in __asm blocks