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Merge pull request #5538 from Rageking8/structure-error-references-in-range-c2101-c2120
Structure error references in range [C2101, C2120]
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‎docs/error-messages/compiler-errors-1/compiler-error-c2101.md‎

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---
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description: "Learn more about: Compiler Error C2101"
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title: "Compiler Error C2101"
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ms.date: "03/04/2024"
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description: "Learn more about: Compiler Error C2101"
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ms.date: 03/04/2024
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f1_keywords: ["C2101"]
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helpviewer_keywords: ["C2101"]
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---
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# Compiler Error C2101
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'&' on constant
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> '&' on constant
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## Remarks
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The [address-of operator (**`&`**)](../../cpp/address-of-operator-amp.md) must have an l-value as operand.
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The following sample generates C2101:
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## Example
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The following example generates C2101:
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```cpp
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// C2101.cpp

‎docs/error-messages/compiler-errors-1/compiler-error-c2102.md‎

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---
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description: "Learn more about: Compiler Error C2102"
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title: "Compiler Error C2102"
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ms.date: "03/03/2024"
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description: "Learn more about: Compiler Error C2102"
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ms.date: 03/03/2024
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f1_keywords: ["C2102"]
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helpviewer_keywords: ["C2102"]
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---
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# Compiler Error C2102
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'&' requires l-value
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> '&' requires l-value
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## Remarks
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The [address-of operator (**`&`**)](../../cpp/address-of-operator-amp.md) must have an l-value as operand. Address of temporary values cannot be taken.
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The following sample generates C2102:
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## Example
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The following example generates C2102:
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```cpp
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// C2102.cpp

‎docs/error-messages/compiler-errors-1/compiler-error-c2103.md‎

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---
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description: "Learn more about: Compiler Error C2103"
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title: "Compiler Error C2103"
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ms.date: "03/04/2024"
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description: "Learn more about: Compiler Error C2103"
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ms.date: 03/04/2024
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f1_keywords: ["C2103"]
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helpviewer_keywords: ["C2103"]
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---
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# Compiler Error C2103
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'&' on register variable
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> '&' on register variable
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## Remarks
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You cannot take the address of a register.
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The following sample generates C2103:
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## Example
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The following example generates C2103:
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```c
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// C2103.c

‎docs/error-messages/compiler-errors-1/compiler-error-c2104.md‎

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---
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description: "Learn more about: Compiler Error C2104"
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title: "Compiler Error C2104"
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ms.date: "11/04/2016"
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description: "Learn more about: Compiler Error C2104"
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ms.date: 11/04/2016
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f1_keywords: ["C2104"]
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helpviewer_keywords: ["C2104"]
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ms.assetid: 2ea78896-72a6-4901-a1fa-f33ea88ad61b
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---
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# Compiler Error C2104
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'&' on bit field ignored
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> '&' on bit field ignored
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## Remarks
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You cannot take the address of a bit field.
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The following sample generates C2104:
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## Example
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The following example generates C2104:
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```cpp
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// C2104.cpp

‎docs/error-messages/compiler-errors-1/compiler-error-c2105.md‎

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---
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description: "Learn more about: Compiler Error C2105"
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title: "Compiler Error C2105"
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ms.date: "11/04/2016"
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description: "Learn more about: Compiler Error C2105"
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ms.date: 11/04/2016
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f1_keywords: ["C2105"]
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helpviewer_keywords: ["C2105"]
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ms.assetid: 19b7f7bc-a9da-4d23-8193-005b6d09274f
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---
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# Compiler Error C2105
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'operator' needs l-value
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> 'operator' needs l-value
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## Remarks
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The operator must have an l-value as operand.
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The following sample generates C2105:
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## Examples
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The following example generates C2105:
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```cpp
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// C2105.cpp
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}
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```
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The following sample generates C2105:
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The following example generates C2105:
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```cpp
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// C2105b.cpp

‎docs/error-messages/compiler-errors-1/compiler-error-c2106.md‎

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---
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description: "Learn more about: Compiler Error C2106"
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title: "Compiler Error C2106"
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ms.date: "11/04/2016"
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description: "Learn more about: Compiler Error C2106"
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ms.date: 11/04/2016
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f1_keywords: ["C2106"]
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helpviewer_keywords: ["C2106"]
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ms.assetid: d5c91a2e-04e4-4770-8478-788b98c52a53
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---
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# Compiler Error C2106
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'operator' : left operand must be l-value
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> 'operator' : left operand must be l-value
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## Remarks
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The operator must have an l-value as its left operand.
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The following sample generates C2106:
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## Example
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The following example generates C2106:
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```cpp
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// C2106.cpp

‎docs/error-messages/compiler-errors-1/compiler-error-c2107.md‎

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---
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description: "Learn more about: Compiler Error C2107"
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title: "Compiler Error C2107"
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ms.date: "11/04/2016"
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description: "Learn more about: Compiler Error C2107"
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ms.date: 11/04/2016
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f1_keywords: ["C2107"]
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helpviewer_keywords: ["C2107"]
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ms.assetid: 2866a121-884e-4bb5-8613-36de5817000e
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---
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# Compiler Error C2107
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illegal index, indirection not allowed
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> illegal index, indirection not allowed
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## Remarks
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A subscript is applied to an expression that does not evaluate to a pointer.
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## Example
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C2107 can occur if you incorrectly use the **`this`** pointer of a value type to access the type's default indexer. For more information, see [Semantics of the `this` pointer](../../dotnet/how-to-define-and-consume-classes-and-structs-cpp-cli.md#BKMK_Semantics_of_the_this_pointer).
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The following sample generates C2107.
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The following example generates C2107.
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```cpp
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// C2107.cpp

‎docs/error-messages/compiler-errors-1/compiler-error-c2108.md‎

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description: "Learn more about: Compiler Error C2108"
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title: "Compiler Error C2108"
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description: "Learn more about: Compiler Error C2108"
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ms.date: 06/03/2022
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f1_keywords: ["C2108"]
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helpviewer_keywords: ["C2108"]
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ms.assetid: c84f0b47-5e2c-47d2-8edb-427a40e17c36
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# Compiler Error C2108
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C2108 can occur if you incorrectly use the **`this`** pointer of a value type to access the type's default indexer. For more information, see [Semantics of the `this` pointer](../../dotnet/how-to-define-and-consume-classes-and-structs-cpp-cli.md#BKMK_Semantics_of_the_this_pointer).
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The following sample generates C2108.
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The following example generates C2108.
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```cpp
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// C2108.cpp

‎docs/error-messages/compiler-errors-1/compiler-error-c2109.md‎

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---
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description: "Learn more about: Compiler Error C2109"
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title: "Compiler Error C2109"
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description: "Learn more about: Compiler Error C2109"
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ms.date: 11/04/2016
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f1_keywords: ["C2109"]
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helpviewer_keywords: ["C2109"]
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# Compiler Error C2109
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subscript requires array or pointer type
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## Remarks
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The subscript was used on a variable that was not an array.
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The following sample generates C2109:
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## Example
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The following example generates C2109:
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```cpp
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// C2109.cpp

‎docs/error-messages/compiler-errors-1/compiler-error-c2110.md‎

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---
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# Compiler Error C2110
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'+' : cannot add two pointers
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## Remarks
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An attempt was made to add two pointer values using the plus (`+`) operator.
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The following sample generates C2110:
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## Example
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The following example generates C2110:
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```cpp
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// C2110.cpp

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