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Update compiler-warnings-c4200-through-c4399.md
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‎docs/error-messages/compiler-warnings/c4371.md

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---
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description: "Learn more about: Compiler Warning (level 3) C4371"
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title: "Compiler Warning (level 3) C4371"
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description: "Learn more about: Compiler Warning (level 3, off) C4371"
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title: "Compiler Warning (level 3, off) C4371"
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ms.date: "01/31/2018"
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> '*classname*': layout of class may have changed from a previous version of the compiler due to better packing of member '*member*'
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If your code relies on a particular memory layout for a class, warning C4371 tells you that the layout created by the current compiler may be different from the layout generated by previous versions of the compiler. This may be significant for serialization operations or operating system interfaces that rely on a particular memory layout. In most other cases, this warning is safe to ignore.
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Warning C4371 tells you that the layout created by the current compiler may be different from the layout generated by previous versions of the compiler. This difference may be significant for serialization operations or operating system interfaces that rely on a particular memory layout. In most other cases, this warning is safe to ignore.
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Warning C4371 is off by default. For more information, see [Compiler Warnings That Are Off By Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md).

‎docs/error-messages/compiler-warnings/c4388.md

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---
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title: "Compiler Warning (level 4) C4388"
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description: "Microsoft C/C++ compiler warning C4388, its causes and resolution."
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title: "Compiler Warning (level 4, off) C4388"
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description: "Learn more about: Compiler Warning (level 4, off) C4388"
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# Compiler Warning (level 4) C4388
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# Compiler Warning (level 4, off) C4388
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> '*token*' : signed/unsigned mismatch
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‎docs/error-messages/compiler-warnings/compiler-warning-c4335.md

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description: "Learn more about: Compiler Warning C4335"
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title: "Compiler Warning C4335"
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description: "Learn more about: Compiler Warning (level 1) C4335"
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title: "Compiler Warning(level 1) C4335"
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# Compiler Warning C4335
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# Compiler Warning (level 1) C4335
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Mac file format detected: please convert the source file to either DOS or UNIX format
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> Mac file format detected: please convert the source file to either DOS or UNIX format
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The line termination character of the first line of a source file is Macintosh style ('\r') as opposed to UNIX ('\n') or DOS ('\r\n').
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The line termination character of the first line of a source file is the old Macintosh style ('\r') as opposed to UNIX ('\n') or DOS ('\r\n').
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This warning is always issued as an error. See [warning](../../preprocessor/warning.md) pragma for information about how to disable this warning. Also, this warning is only issued once per compiland. Therefore, if there are multiple `#include` directives that specify files in Macintosh format, C4335 will only be issued once.
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This warning is only issued once per translation unit. Therefore, if there are multiple `#include` directives that specify files in Macintosh format, C4335 is emitted once.
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One way to generate files in Macintosh format is by using the **Advanced Save Options** (on the **File** menu) in Visual Studio.
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‎docs/error-messages/compiler-warnings/compiler-warning-c4368.md

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---
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description: "Learn more about: Compiler Warning C4368"
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title: "Compiler Warning C4368"
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description: "Learn more about: Compiler Warning (level 1, Error) C4368"
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title: "Compiler Warning (level 1, Error) C4368"
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f1_keywords: ["C4368"]
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helpviewer_keywords: ["C4368"]
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# Compiler Warning C4368
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# Compiler Warning (level 1, Error) C4368
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cannot define 'member' as a member of managed 'type': mixed types are not supported
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> cannot define 'member' as a member of managed 'type': mixed types are not supported
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You cannot embed a native data member in a CLR type.
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You can't embed a native data member in a managed type.
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You can, however, declare a pointer to a native type and control its lifetime in the constructor and destructor and finalizer of your managed class. For more information see [Destructors and finalizers](../../dotnet/how-to-define-and-consume-classes-and-structs-cpp-cli.md#BKMK_Destructors_and_finalizers).
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You can, however, declare a pointer to a native type and control its lifetime in the constructor and destructor and finalizer of your managed class. For more information, see [Destructors and finalizers](../../dotnet/how-to-define-and-consume-classes-and-structs-cpp-cli.md#BKMK_Destructors_and_finalizers).
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This warning is always issued as an error. Use the [warning](../../preprocessor/warning.md) pragma to disable C4368.
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‎docs/error-messages/compiler-warnings/compiler-warning-c4394.md

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description: "Learn more about: Compiler Warning C4394"
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title: "Compiler Warning C4394"
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description: "Learn more about: Compiler Warning (level 1, Error) C4394"
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title: "Compiler Warning (level 1, Error) C4394"
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# Compiler Warning C4394
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# Compiler Warning (level 1, Error) C4394
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'function' : per-appdomain symbol should not be marked with __declspec(dllexport)
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> 'function' : per-appdomain symbol should not be marked with __declspec(dllexport)
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A function marked with the [appdomain](../../cpp/appdomain.md) **`__declspec`** modifier is compiled to MSIL (not to native), and export tables ([export](../../windows/attributes/export.md) **`__declspec`** modifier) are not supported for managed functions.
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A function marked with the [appdomain](../../cpp/appdomain.md) **`__declspec`** modifier is compiled to MSIL (not native), and export tables ([export](../../windows/attributes/export.md) **`__declspec`** modifier) aren't supported for managed functions.
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You can declare a managed function to have public accessibility. For more information, see [Type visibility](../../dotnet/how-to-define-and-consume-classes-and-structs-cpp-cli.md#BKMK_Type_visibility) and [Member visibility](../../dotnet/how-to-define-and-consume-classes-and-structs-cpp-cli.md#BKMK_Member_visibility).
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C4394 is always issued as an error. You can turn off this warning with the `#pragma warning` or **/wd**; see [warning](../../preprocessor/warning.md) or [/w, /W0, /W1, /W2, /W3, /W4, /w1, /w2, /w3, /w4, /Wall, /wd, /we, /wo, /Wv, /WX (Warning Level)](../../build/reference/compiler-option-warning-level.md) for more information.
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C4394 is always issued as an error. You can turn off this warning or change its level with `#pragma warning` or **/wd**. For more information, see [warning](../../preprocessor/warning.md) or [/w, /W0, /W1, /W2, /W3, /W4, /w1, /w2, /w3, /w4, /Wall, /wd, /we, /wo, /Wv, /WX (Warning Level)](../../build/reference/compiler-option-warning-level.md).
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## Example
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‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4264.md

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description: "Learn more about: Compiler Warning (level 1) C4264"
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title: "Compiler Warning (level 1) C4264"
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description: "Learn more about: Compiler Warning (level 4, off) C4264"
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title: "Compiler Warning (level 4, off) C4264"
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# Compiler Warning (level 1) C4264
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# Compiler Warning (level 4, off) C4264
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> 'virtual_function' : no override available for virtual member function from base 'class'; function is hidden
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C4264 is always generated after [C4263](../../error-messages/compiler-warnings/compiler-warning-level-4-c4263.md).
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This warning is off by default. See [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md) for more information.
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This warning is off by default. For more information, see [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md).

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4392.md

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description: "Learn more about: Compiler Warning (level 1) C4392"
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title: "Compiler Warning (level 1) C4392"
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description: "Learn more about: Compiler Warning (level 1, Error) C4392"
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title: "Compiler Warning (level 1, Error) C4392"
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# Compiler Warning (level 1) C4392
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# Compiler Warning (level 1, Error) C4392
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'signature' : incorrect number of arguments for intrinsic function, expected 'number' arguments
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> 'signature' : incorrect number of arguments for intrinsic function, expected 'number' arguments
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A function declaration for a compiler intrinsic had the wrong number of arguments. The resulting image may not run correctly.
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A function declaration for a compiler intrinsic had the wrong number of arguments. The resulting image may not run correctly. To fix this warning, either correct the declaration or delete the declaration and `#include` the appropriate header file.
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To fix this warning, either correct the declaration or delete the declaration and simply #include the appropriate header file.
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This warning is always issued as an error. Use the [warning](../../preprocessor/warning.md) pragma to disable or change the warning level.
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The following sample generates C4392:
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‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4399.md

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description: "Learn more about: Compiler Warning (level 1) C4399"
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title: "Compiler Warning (level 1) C4399"
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description: "Learn more about: Compiler Warning (level 1, Error) C4399"
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title: "Compiler Warning (level 1, Error) C4399"
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# Compiler Warning (level 1) C4399
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# Compiler Warning (level 1, Error) C4399
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> '*symbol*' : per-process symbol should not be marked with __declspec(dllimport) when compiled with /clr:pure
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## Remarks
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The **/clr:pure** compiler option is deprecated in Visual Studio 2015 and unsupported in Visual Studio 2017.
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Data from a native image or an image with native and CLR constructs can not be imported into a pure image. To resolve this warning, compile with **/clr** (not **/clr:pure**) or delete `__declspec(dllimport)`.
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Data from a native image or an image with native and common language runtime (CLR) constructs can't be imported into a pure image. To resolve this warning, compile with **/clr** (not **/clr:pure**) or delete `__declspec(dllimport)`.
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This warning can be issued as an error. Use the [warning](../../preprocessor/warning.md) pragma to disable or change the warning level.
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## Example
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‎docs/error-messages/compiler-warnings/compiler-warning-level-3-c4265.md

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description: "Learn more about: Compiler Warning (level 3) C4265"
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description: "Learn more about: Compiler Warning (level 3, off) C4265"
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title: "Compiler Warning (level 3, off) C4265"
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# Compiler Warning (level 3) C4265
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# Compiler Warning (level 3, off) C4265
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This warning is off by default. See [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md) for more information.
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This warning is off by default. For more information, see [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md).
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The following sample generates C4265:
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‎docs/error-messages/compiler-warnings/compiler-warning-level-3-c4278.md

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description: "Learn more about: Compiler Warning (level 3) C4278"
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description: "Learn more about: Compiler Warning (level 3 and level 4) C4278"
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title: "Compiler Warning (level 3 and level 4) C4278"
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# Compiler Warning (level 3) C4278
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# Compiler Warning (level 3 and level 4) C4278
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The [`#import`](../../preprocessor/hash-import-directive-cpp.md) is attempting to import an identifier into the translation unit. However, there's already a symbol with that name. Use the `#import` **rename** attribute to assign an alias to the symbol in the type library.

‎docs/error-messages/compiler-warnings/compiler-warning-level-3-c4287.md

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description: "Learn more about: Compiler Warning (level 3) C4287"
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description: "Learn more about: Compiler Warning (level 3, off) C4287"
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title: "Compiler Warning (level 3, off) C4287"
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# Compiler Warning (level 3) C4287
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# Compiler Warning (level 3, off) C4287
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This warning is off by default. See [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md) for more information.
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This warning is off by default. For more information, see [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md).
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## Example
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‎docs/error-messages/compiler-warnings/compiler-warning-level-3-c4359.md

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description: "Learn more about: Compiler Warning (level 3) C4359"
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description: "Learn more about: Compiler Warning (level 1 and level 3) C4359"
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title: "Compiler Warning (level 1 and level 3) C4359"
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# Compiler Warning (level 3) C4359
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# Compiler Warning (level 1 and level 3) C4359
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The alignment specified for a type is less than the alignment of the type of one of its data members. For more information, see [align](../../cpp/align-cpp.md).
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‎docs/error-messages/compiler-warnings/compiler-warning-level-3-c4373.md

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description: "Learn more about: Compiler Warning (level 3) C4373"
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description: "Learn more about: Compiler Warning (level 4) C4373"
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# Compiler Warning (level 3) C4373
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# Compiler Warning (level 4) C4373
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Your application contains a method in a derived class that overrides a virtual method in a base class, and the parameters in the overriding method differ by only a [const](../../cpp/const-cpp.md) or [volatile](../../cpp/volatile-cpp.md) qualifier from the parameters of the virtual method. This means the compiler must bind a function reference to the method in either the base or derived class.
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Your application contains a method in a derived class that overrides a virtual method in a base class. The parameters in the overriding method differ by a [`const`](../../cpp/const-cpp.md) or [`volatile`](../../cpp/volatile-cpp.md) qualifier from the parameters of the virtual method.
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Versions of the compiler prior to Visual Studio 2008 bind the function to the method in the base class, then issue a warning message. Later versions of the compiler ignore the **`const`** or **`volatile`** qualifier, bind the function to the method in the derived class, then issue warning **C4373**. The later behavior conforms to the C++ standard.
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Before Visual Studio 2008, the compiler would bind the function to the method in the base class. Later versions of the compiler ignore the **`const`** or **`volatile`** qualifier, bind the function to the method in the derived class, then issue warning **C4373**. The latter behavior conforms to the C++ standard.
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## Example
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The following code example generates warning C4373. To resolve this issue, you can either make the override use the same CV-qualifiers as the base member function, or if you did not intend to create an override, you can give the function in the derived class a different name.
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The following code example generates warning C4373. To resolve this issue, make the override use the same CV-qualifiers as the base member function. If you didn't intend to create an override, rename the function in the derived class.
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```cpp
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// c4373.cpp

‎docs/error-messages/compiler-warnings/compiler-warning-level-4-c4255.md

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description: "Learn more about: Compiler Warning (level 4) C4255"
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description: "Learn more about: Compiler Warning (level 4, off) C4255"
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title: "Compiler Warning (level 4, off) C4255"
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# Compiler Warning (level 4) C4255
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# Compiler Warning (level 4, off) C4255
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The compiler didn't find an explicit list of arguments to a function. This warning is for the C compiler only.
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This warning is off by default. See [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md) for more information.
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This warning is off by default. For more information, see [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md).
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The following sample generates C4255:
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‎docs/error-messages/compiler-warnings/compiler-warning-level-4-c4263.md

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description: "Learn more about: Compiler Warning (level 4) C4263"
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description: "Learn more about: Compiler Warning (level 4, off) C4263"
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title: "Compiler Warning (level 4, off) C4263"
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# Compiler Warning (level 4) C4263
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# Compiler Warning (level 4, off) C4263
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> 'function' : member function does not override any base class virtual member function
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This warning is off by default. See [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md) for more information.
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This warning is off by default. For more information, see [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md).
1615

1716
The following sample generates C4263:
1817

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