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---
title: "noinline | Microsoft Docs"
ms.custom: ""
ms.date: "11/04/2016"
ms.reviewer: ""
ms.suite: ""
ms.technology: ["cpp-language"]
ms.tgt_pltfrm: ""
ms.topic: "language-reference"
f1_keywords: ["noinline", "noinline_cpp"]
dev_langs: ["C++"]
helpviewer_keywords: ["[""noinline __declspec keyword [C++]"", ""__declspec keyword [C++], noinline""]"]
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author: "mikeblome"
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---__declspec(noinline) tells the compiler to never inline a particular member function (function in a class).
It may be worthwhile to not inline a function if it is small and not critical to the performance of your code. That is, if the function is small and not likely to be called often, such as a function that handles an error condition.
Keep in mind that if a function is marked noinline, the calling function will be smaller and thus, itself a candidate for compiler inlining.
class X {
__declspec(noinline) int mbrfunc() {
return 0;
} // will not inline
};
END Microsoft Specific