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Merge pull request #4123 from corob-msft/docs/corob/C5054
Add C5054, C5055, C5056 warnings
2 parents 081f7c8 + 18b28c9 commit 0668927

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‎docs/error-messages/compiler-warnings/c5054.md‎

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---
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title: "Compiler Warning C5054"
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description: Compiler warning C5054 description and solution.
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ms.date: 02/22/2022
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f1_keywords: ["C5054"]
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helpviewer_keywords: ["C5054"]
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---
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# Compiler warning (level 4) C5054
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> operator '*operator-name*': deprecated between enumerations of different types
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## Remarks
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C++20 has deprecated the usual arithmetic conversions on operands, where one operand is of enumeration type and the other is of a different enumeration type. For more information, see C++ Standard proposal [P1120R0](https://wg21.link/p1120r0).
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In Visual Studio 2019 version 16.2 and later, an implicit conversion between enumeration types produces a level 4 warning when the **`/std:c++latest`** compiler option is enabled. In Visual Studio 2019 version 16.11 and later, it also produces a warning under **`/std:c++20`**.
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## Example
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In Visual Studio 2019 version 16.2 and later, the following code produces a level 4 warning when the **`/std:c++latest`** compiler option is enabled. In Visual Studio 2019 version 16.11 and later, it also produces a warning under **`/std:c++20`**:
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```cpp
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// C5054.cpp
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// Compile using: cl /EHsc /W4 /std:c++latest C5054.cpp
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enum E1 { a };
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enum E2 { b };
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int main() {
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int i = a | b; // warning C5054: operator '|': deprecated between enumerations of different types
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}
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```
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To avoid the warning, use [`static_cast`](../../cpp/static-cast-operator.md) to convert the second operand:
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```cpp
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// C5054_fixed.cpp
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// Compile using: cl /EHsc /W4 /std:c++latest C5054_fixed.cpp
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enum E1 { a };
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enum E2 { b };
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int main() {
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int i = a | static_cast<int>(b);
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}
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```

‎docs/error-messages/compiler-warnings/c5055.md‎

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---
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title: "Compiler Warning C5055"
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description: Compiler warning C5055 description and solution.
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ms.date: 02/22/2022
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f1_keywords: ["C5055"]
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helpviewer_keywords: ["C5055"]
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---
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# Compiler warning (level 1) C5055
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> operator '*operator-name*': deprecated between enumerations and floating-point types
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## Remarks
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C++20 has deprecated the usual arithmetic conversions on operands, where one operand is of enumeration type and the other is of floating-point type. For more information, see C++ Standard proposal [P1120R0](https://wg21.link/p1120r0).
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In Visual Studio 2019 version 16.2 and later, an implicit conversion between enumeration types and floating-point types produces a level 1 warning when the **`/std:c++latest`** compiler option is enabled. In Visual Studio 2019 version 16.11 and later, it also produces a warning under **`/std:c++20`**.
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## Example
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In Visual Studio 2019 version 16.2 and later, a binary operation between an enumeration and a floating-point type produces a level 1 warning when the **`/std:c++latest`** compiler option is enabled. In Visual Studio 2019 version 16.11 and later, it also produces a warning under **`/std:c++20`**:
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```cpp
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// C5055.cpp
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// Compile using: cl /EHsc /W4 /std:c++latest C5055.cpp
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enum E1 { a };
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int main() {
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double i = a * 1.1; // Warning C5055: operator '*': deprecated between enumerations and floating-point types
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}
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```
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To avoid the warning, use [`static_cast`](../../cpp/static-cast-operator.md) to convert the second operand:
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```cpp
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// C5055_fixed.cpp
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// Compile using: cl /EHsc /W4 /std:c++latest C5055_fixed.cpp
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enum E1 { a };
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int main() {
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double i = static_cast<int>(a) * 1.1;
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}
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```

‎docs/error-messages/compiler-warnings/c5056.md‎

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---
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title: "Compiler Warning C5056"
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description: Compiler warning C5056 description and solution.
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ms.date: 02/22/2022
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f1_keywords: ["C5056"]
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helpviewer_keywords: ["C5056"]
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---
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# Compiler warning (level 1) C5056
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> operator '*operator-name*': deprecated for array types
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## Remarks
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Equality and relational comparisons between two operands of array type are deprecated in C++20. For more information, see C++ Standard proposal [P1120R0](https://wg21.link/p1120r0).
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In Visual Studio 2019 version 16.2 and later, a comparison operation between two arrays (despite rank and extent similarities) now produces a level 1 C5056 warning when the **`/std:c++latest`** compiler option is enabled. In Visual Studio 2019 version 16.11 and later, it also produces a warning under **`/std:c++20`**.
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## Example
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In Visual Studio 2019 version 16.2 and later, the following code produces warning C5056 when the **`/std:c++latest`** compiler option is enabled. In Visual Studio 2019 version 16.11 and later, it also produces a warning under **`/std:c++20`**:
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```cpp
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// C5056.cpp
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// Compile using: cl /EHsc /W4 /std:c++latest C5056.cpp
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int main() {
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int a[] = { 1, 2, 3 };
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int b[] = { 1, 2, 3 };
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if (a == b) { return 1; } // warning C5056: operator '==': deprecated for array types
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}
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```
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To avoid the warning, you can compare the addresses of the first elements:
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```cpp
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// C5056_fixed.cpp
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// Compile using: cl /EHsc /W4 /std:c++latest C5056_fixed.cpp
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int main() {
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int a[] = { 1, 2, 3 };
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int b[] = { 1, 2, 3 };
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if (&a[0] == &b[0]) { return 1; }
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}
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```
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To determine whether the contents of two arrays are equal, use the [`std::equal`](../../standard-library/algorithm-functions.md#equal) function:
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```cpp
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std::equal(std::begin(a), std::end(a), std::begin(b), std::end(b));
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```

‎docs/error-messages/compiler-warnings/compiler-warnings-c4800-through-c4999.md‎

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title: "Compiler warnings C4800 Through C5999"
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description: "Table of Microsoft C/C++ compiler warnings C4800 through C5999."
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ms.date: 02/22/2022
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f1_keywords: ["C4808", "C4809", "C4825", "C4827", "C4837", "C4842", "C4844", "C4845", "C4846", "C4847", "C4848", "C4854", "C4855", "C4856", "C4857", "C4872", "C4880", "C4881", "C4882", "C4916", "C4921", "C4934", "C4954", "C4955", "C4963", "C4966", "C4970", "C4971", "C4973", "C4974", "C4981", "C4987", "C4988", "C4989", "C4990", "C4991", "C4992", "C4998", "C5022", "C5023", "C5024", "C5025", "C5026", "C5027", "C5028", "C5029", "C5030", "C5031", "C5032", "C5034", "C5035", "C5036", "C5039", "C5040", "C5041", "C5042", "C5043", "C5044", "C5047", "C5048", "C5049", "C5051", "C5052", "C5053", "C5054", "C5055", "C5056", "C5057", "C5058", "C5059", "C5060", "C5061", "C5062", "C5063", "C5100", "C5101", "C5102", "C5103", "C5104", "C5106", "C5107", "C5108", "C5200", "C5201", "C5202", "C5203", "C5204", "C5205", "C5206", "C5207", "C5209", "C5210", "C5211", "C5212", "C5213", "C5214", "C5215", "C5216", "C5217", "C5218", "C5219", "C5220", "C5221", "C5222", "C5223", "C5224", "C5225", "C5226", "C5227", "C5228", "C5229", "C5230", "C5231", "C5232", "C5233", "C5234", "C5235", "C5236", "C5237", "C5238", "C5239", "C5241", "C5242", "C5244", "C5245", "C5246", "C5249", "C5250", "C5251", "C5252", "C5253", "C5254"]
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helpviewer_keywords: ["C4808", "C4809", "C4825", "C4827", "C4837", "C4842", "C4844", "C4845", "C4846", "C4847", "C4848", "C4854", "C4855", "C4856", "C4857", "C4872", "C4880", "C4881", "C4882", "C4916", "C4921", "C4934", "C4954", "C4955", "C4963", "C4966", "C4970", "C4971", "C4973", "C4974", "C4981", "C4987", "C4988", "C4989", "C4990", "C4991", "C4992", "C4998", "C5022", "C5023", "C5024", "C5025", "C5026", "C5027", "C5028", "C5029", "C5030", "C5031", "C5032", "C5034", "C5035", "C5036", "C5039", "C5040", "C5041", "C5042", "C5043", "C5044", "C5047", "C5048", "C5049", "C5051", "C5052", "C5053", "C5054", "C5055", "C5056", "C5057", "C5058", "C5059", "C5060", "C5061", "C5062", "C5063", "C5100", "C5101", "C5102", "C5103", "C5104", "C5106", "C5107", "C5108", "C5200", "C5201", "C5202", "C5203", "C5204", "C5205", "C5206", "C5207", "C5209", "C5210", "C5211", "C5212", "C5213", "C5214", "C5215", "C5216", "C5217", "C5218", "C5219", "C5220", "C5221", "C5222", "C5223", "C5224", "C5225", "C5226", "C5227", "C5228", "C5229", "C5230", "C5231", "C5232", "C5233", "C5234", "C5235", "C5236", "C5237", "C5238", "C5239", "C5241", "C5242", "C5244", "C5245", "C5246", "C5249", "C5250", "C5251", "C5252", "C5253", "C5254"]
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f1_keywords: ["C4808", "C4809", "C4825", "C4827", "C4837", "C4842", "C4844", "C4845", "C4846", "C4847", "C4848", "C4854", "C4855", "C4856", "C4857", "C4872", "C4880", "C4881", "C4882", "C4916", "C4921", "C4934", "C4954", "C4955", "C4963", "C4966", "C4970", "C4971", "C4973", "C4974", "C4981", "C4987", "C4988", "C4989", "C4990", "C4991", "C4992", "C4998", "C5022", "C5023", "C5024", "C5025", "C5026", "C5027", "C5028", "C5029", "C5030", "C5031", "C5032", "C5034", "C5035", "C5036", "C5039", "C5040", "C5041", "C5042", "C5043", "C5044", "C5047", "C5048", "C5049", "C5051", "C5052", "C5053", "C5057", "C5058", "C5059", "C5060", "C5061", "C5062", "C5063", "C5100", "C5101", "C5102", "C5103", "C5104", "C5106", "C5107", "C5108", "C5200", "C5201", "C5202", "C5203", "C5204", "C5205", "C5206", "C5207", "C5209", "C5210", "C5211", "C5212", "C5213", "C5214", "C5215", "C5216", "C5217", "C5218", "C5219", "C5220", "C5221", "C5222", "C5223", "C5224", "C5225", "C5226", "C5227", "C5228", "C5229", "C5230", "C5231", "C5232", "C5233", "C5234", "C5235", "C5236", "C5237", "C5238", "C5239", "C5241", "C5242", "C5244", "C5245", "C5246", "C5249", "C5250", "C5251", "C5252", "C5253", "C5254"]
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helpviewer_keywords: ["C4808", "C4809", "C4825", "C4827", "C4837", "C4842", "C4844", "C4845", "C4846", "C4847", "C4848", "C4854", "C4855", "C4856", "C4857", "C4872", "C4880", "C4881", "C4882", "C4916", "C4921", "C4934", "C4954", "C4955", "C4963", "C4966", "C4970", "C4971", "C4973", "C4974", "C4981", "C4987", "C4988", "C4989", "C4990", "C4991", "C4992", "C4998", "C5022", "C5023", "C5024", "C5025", "C5026", "C5027", "C5028", "C5029", "C5030", "C5031", "C5032", "C5034", "C5035", "C5036", "C5039", "C5040", "C5041", "C5042", "C5043", "C5044", "C5047", "C5048", "C5049", "C5051", "C5052", "C5053", "C5057", "C5058", "C5059", "C5060", "C5061", "C5062", "C5063", "C5100", "C5101", "C5102", "C5103", "C5104", "C5106", "C5107", "C5108", "C5200", "C5201", "C5202", "C5203", "C5204", "C5205", "C5206", "C5207", "C5209", "C5210", "C5211", "C5212", "C5213", "C5214", "C5215", "C5216", "C5217", "C5218", "C5219", "C5220", "C5221", "C5222", "C5223", "C5224", "C5225", "C5226", "C5227", "C5228", "C5229", "C5230", "C5231", "C5232", "C5233", "C5234", "C5235", "C5236", "C5237", "C5238", "C5239", "C5241", "C5242", "C5244", "C5245", "C5246", "C5249", "C5250", "C5251", "C5252", "C5253", "C5254"]
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---
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# Compiler warnings C4800 through C5999
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| Compiler warning (level 1) C5051 | attribute 'attribute-name' requires at least 'standard-level'; ignored |
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| Compiler warning (level 3, off) C5052 | Keyword 'keyword-name' was introduced in C++\<version> and requires use of the 'option-name' command-line option |
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| Compiler warning (level 1) C5053 | support for '`explicit(<expr>)`' in C++17 and earlier is a vendor extension |
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| Compiler warning (level 4) C5054 | operator 'operator-name': deprecated between enumerations of different types |
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| Compiler warning (level 1) C5055 | operator 'operator-name': deprecated between enumerations and floating-point types |
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| Compiler warning (level 1) C5056 | operator 'operator-name': deprecated for array types |
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| [Compiler warning (level 4) C5054](c5054.md) | operator 'operator-name': deprecated between enumerations of different types |
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| [Compiler warning (level 1) C5055](c5055.md) | operator 'operator-name': deprecated between enumerations and floating-point types |
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| [Compiler warning (level 1) C5056](c5056.md) | operator 'operator-name': deprecated for array types |
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| Compiler warning (level 1) C5057 | header unit reference to 'name' already exists. Ignoring header unit 'header-name' |
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| Compiler warning (level 1) C5058 | file system error: cannot find header file 'file-name' for header unit 'unit-name' |
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| Compiler warning C5059 | runtime checks and address sanitizer is not currently supported - disabling runtime checks |
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## See also
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[C/C++ Compiler and build tools errors and warnings](../compiler-errors-1/c-cpp-build-errors.md) \
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[C/C++ Compiler and build tools errors and warnings](../compiler-errors-1/c-cpp-build-errors.md)\
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[Compiler warnings C4000 - C5999](compiler-warnings-c4000-c5999.md)

‎docs/error-messages/toc.yml‎

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href: compiler-warnings/c5046.md
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- name: Compiler warning C5050
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href: compiler-warnings/c5050.md
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- name: Compiler warning (level 4) C5054
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href: compiler-warnings/c5054.md
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- name: Compiler warning (level 1) C5055
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href: compiler-warnings/c5055.md
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- name: Compiler warning (level 1) C5056
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- name: Compiler warning (level 1) C5105
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- name: Compiler warning (level 1) C5208

‎docs/overview/cpp-conformance-improvements-2019.md‎

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---
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title: "C++ conformance improvements in Visual Studio 2019"
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description: "Microsoft C++ in Visual Studio is progressing toward full conformance with the C++20 language standard."
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ms.date: 02/22/2022
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ms.technology: "cpp-language"
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---
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# C++ Conformance improvements, behavior changes, and bug fixes in Visual Studio 2019
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For more information, see [P1120R0](https://wg21.link/p1120r0).
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In Visual Studio 2019 version 16.2 and later, the following code produces a level 4 warning when the **`/std:c++latest`** compiler option is enabled (**`/std:c++20`** starting in Visual Studio 2019 version 16.11):
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In Visual Studio 2019 version 16.2 and later, the following code produces a level 4 C5054 warning when the **`/std:c++latest`** compiler option is enabled (**`/std:c++20`** starting in Visual Studio 2019 version 16.11):
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```cpp
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enum E1 { a };
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}
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```
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Using a binary operation between an enumeration and a floating-point type is now a warning when the **`/std:c++latest`** compiler option is enabled (**`/std:c++20`** starting in Visual Studio 2019 version 16.11):
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Using a binary operation between an enumeration and a floating-point type is now a level 1 C5055 warning when the **`/std:c++latest`** compiler option is enabled (**`/std:c++20`** starting in Visual Studio 2019 version 16.11):
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```cpp
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### Equality and relational comparisons of arrays
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Equality and relational comparisons between two operands of array type are deprecated in C++20 ([P1120R0](https://wg21.link/p1120r0)). In other words, a comparison operation between two arrays (despite rank and extent similarities) is now a warning. Starting in Visual Studio 2019 version 16.2, the following code produces C5056 when the **`/std:c++latest`** compiler option is enabled (**`/std:c++20`** starting in Visual Studio 2019 version 16.11):
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Equality and relational comparisons between two operands of array type are deprecated in C++20 ([P1120R0](https://wg21.link/p1120r0)). In other words, a comparison operation between two arrays (despite rank and extent similarities) is now a warning. Starting in Visual Studio 2019 version 16.2, the following code produces level 1 warning C5056 when the **`/std:c++latest`** compiler option is enabled (**`/std:c++20`** starting in Visual Studio 2019 version 16.11):
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```cpp
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int main() {

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