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Merge pull request #5706 from Rageking8/structure-warning-references-in-range-c4000-c4040
Structure warning references in range [C4000, C4040]
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‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4002.md‎

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---
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description: "Learn more about: Compiler Warning (level 1, Error) C4002"
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title: "Compiler Warning (level 1, Error) C4002"
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ms.date: "11/04/2016"
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description: "Learn more about: Compiler Warning (level 1, Error) C4002"
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ms.date: 11/04/2016
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f1_keywords: ["C4002"]
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helpviewer_keywords: ["C4002"]
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---
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# Compiler Warning (level 1, Error) C4002
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> too many arguments for function-like macro invocation '*identifier*'
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## Remarks
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The number of actual parameters in the macro exceeds the number of formal parameters in the macro definition. The preprocessor collects the extra parameters but ignores them during macro expansion.
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C4002 can occur when incorrectly using [variadic macros](../../preprocessor/variadic-macros.md).
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The following sample generates C4002:
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## Example
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The following example generates C4002:
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```cpp
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// C4002.cpp

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4003.md‎

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---
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description: "Learn more about: Compiler Warning (level 1, Error) C4003"
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title: "Compiler Warning (level 1, Error) C4003"
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ms.date: "11/04/2016"
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description: "Learn more about: Compiler Warning (level 1, Error) C4003"
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ms.date: 11/04/2016
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f1_keywords: ["C4003"]
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helpviewer_keywords: ["C4003"]
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---
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# Compiler Warning (level 1, Error) C4003
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> not enough arguments for function-like macro invocation '*identifier*'
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## Remarks
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The number of formal parameters in the macro definition exceeds the number of actual parameters in the macro. Macro expansion substitutes empty text for the missing parameters.
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The following sample generates C4003:
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## Example
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The following example generates C4003:
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```cpp
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// C4003.cpp

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4005.md‎

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description: "Learn more about: Compiler Warning (level 1) C4005"
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title: "Compiler Warning (level 1) C4005"
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ms.date: "11/04/2016"
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description: "Learn more about: Compiler Warning (level 1) C4005"
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ms.date: 11/04/2016
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f1_keywords: ["C4005"]
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helpviewer_keywords: ["C4005"]
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ms.assetid: 7f2dc79a-9fcb-4d5b-be61-120d9cb487ad
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---
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# Compiler Warning (level 1) C4005
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'identifier' : macro redefinition
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> 'identifier' : macro redefinition
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## Remarks
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The macro identifier is defined twice. The compiler uses the second macro definition.
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1. Use an [#undef](../../preprocessor/hash-undef-directive-c-cpp.md) directive before the second definition.
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The following sample generates C4005:
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## Example
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The following example generates C4005:
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```cpp
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// C4005.cpp

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4006.md‎

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---
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description: "Learn more about: Compiler Warning (level 1) C4006"
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title: "Compiler Warning (level 1) C4006"
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ms.date: "11/04/2016"
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description: "Learn more about: Compiler Warning (level 1) C4006"
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ms.date: 11/04/2016
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f1_keywords: ["C4006"]
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helpviewer_keywords: ["C4006"]
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ms.assetid: f1a59819-0fd2-4361-8e3a-99e4b514b8e1
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---
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# Compiler Warning (level 1) C4006
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\#undef expected an identifier
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> #undef expected an identifier
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## Remarks
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The `#undef` directive did not specify an identifier to undefine. The directive is ignored. To resolve the warning, be sure to specify an identifier.
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## Example
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The `#undef` directive did not specify an identifier to undefine. The directive is ignored. To resolve the warning, be sure to specify an identifier. The following sample generates C4006:
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The following example generates C4006:
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```cpp
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// C4006.cpp

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4010.md‎

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---
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description: "Learn more about: Compiler Warning (level 1) C4010"
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title: "Compiler Warning (level 1) C4010"
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ms.date: "11/04/2016"
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description: "Learn more about: Compiler Warning (level 1) C4010"
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ms.date: 11/04/2016
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f1_keywords: ["C4010"]
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helpviewer_keywords: ["C4010"]
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ms.assetid: d607a9ff-8f8f-45c0-b07b-3b2f439e5485
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---
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# Compiler Warning (level 1) C4010
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single-line comment contains line-continuation character
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> single-line comment contains line-continuation character
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## Remarks
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A single-line comment, which is introduced by //, contains a backslash (\\) that serves as a line-continuation character. The compiler considers the next line to be a continuation and treats it as a comment.
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Some syntax-directed editors do not indicate the line following the continuation character as a comment. Ignore syntax coloring on any lines that cause this warning.
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The following sample generates C4010:
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## Example
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The following example generates C4010:
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```cpp
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// C4010.cpp

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4015.md‎

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---
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description: "Learn more about: Compiler Warning (level 1) C4015"
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title: "Compiler Warning (level 1) C4015"
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description: "Learn more about: Compiler Warning (level 1) C4015"
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ms.date: 11/04/2016
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f1_keywords: ["C4015"]
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helpviewer_keywords: ["C4015"]
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ms.assetid: 7242ab90-c869-482f-8152-46728575837e
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---
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# Compiler Warning (level 1) C4015
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'identifier' : type of bit field must be integral
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> 'identifier' : type of bit field must be integral
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## Remarks
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The bit field is not declared as an integer type. The compiler assumes the base type of the bit field to be unsigned. Bit fields must be declared as unsigned integer types.

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4020.md‎

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description: "Learn more about: Compiler Warning (level 1) C4020"
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title: "Compiler Warning (level 1) C4020"
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description: "Learn more about: Compiler Warning (level 1) C4020"
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ms.date: 11/04/2016
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f1_keywords: ["C4020"]
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helpviewer_keywords: ["C4020"]
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ms.assetid: 8c4cd6be-9371-4c8c-b0ff-a5ad367bbab0
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---
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# Compiler Warning (level 1) C4020
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'function' : too many actual parameters
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> 'function' : too many actual parameters
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## Remarks
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The number of actual parameters in a function call exceeds the number of formal parameters in the function prototype or definition. The compiler passes the extra actual parameters according to the calling convention of the function.
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The following sample generates C4020:
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## Example
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The following example generates C4020:
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```c
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// C4020.c

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4022.md‎

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---
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description: "Learn more about: Compiler Warning (level 1) C4022"
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title: "Compiler Warning (level 1) C4022"
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description: "Learn more about: Compiler Warning (level 1) C4022"
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ms.date: 11/04/2016
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f1_keywords: ["C4022"]
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helpviewer_keywords: ["C4022"]
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---
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# Compiler Warning (level 1) C4022
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'function' : pointer mismatch for actual parameter 'number'
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> 'function' : pointer mismatch for actual parameter 'number'
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## Remarks
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The pointer type of the actual parameter differs from the pointer type of the corresponding formal parameter. The actual parameter is passed without change.

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4024.md‎

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description: "Learn more about: Compiler Warning (level 1) C4024"
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title: "Compiler Warning (level 1) C4024"
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description: "Learn more about: Compiler Warning (level 1) C4024"
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ms.date: 11/04/2016
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f1_keywords: ["C4024"]
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helpviewer_keywords: ["C4024"]
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---
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# Compiler Warning (level 1) C4024
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'function' : different types for formal and actual parameter 'number'
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> 'function' : different types for formal and actual parameter 'number'
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## Remarks
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Corresponding formal and actual parameters have different types. The compiler passes the actual parameter without change. The receiving function converts the parameter type to the type expected.

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4025.md‎

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description: "Learn more about: Compiler Warning (level 1) C4025"
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title: "Compiler Warning (level 1) C4025"
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description: "Learn more about: Compiler Warning (level 1) C4025"
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ms.date: 11/04/2016
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f1_keywords: ["C4025"]
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helpviewer_keywords: ["C4025"]
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---
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# Compiler Warning (level 1) C4025
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> 'number' : based pointer passed to function with variable arguments: parameter number
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## Remarks
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Passing a based pointer to a function with variable arguments causes the pointer to be normalized, with unpredictable results. Do not pass based pointers to functions with variable arguments.

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