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merged 3 commits into from
Oct 31, 2023
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Add example to C3550 #4754

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8d566a0
Add example to C3550
Rageking8 Oct 6, 2023
c89da7c
Remove function body in example
Rageking8 Oct 6, 2023
6c6c176
Add example of correction
Rageking8 Oct 18, 2023
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18 changes: 17 additions & 1 deletion docs/error-messages/compiler-errors-2/compiler-error-c3550.md
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Expand Up @@ -10,7 +10,23 @@ ms.assetid: 9f2d5ffc-e429-41a1-89e3-7acc4fd47e14

only plain 'decltype(auto)' is allowed in this context

If `decltype(auto)` is used as a placeholder for the return type of a function, it must be used by itself. It cannot be used as part of a pointer declaration (`decltype(auto*)`), a reference declaration (`decltype(auto&)`), or any other such qualification.
If [`decltype(auto)`](../../cpp/decltype-cpp.md#decltype-and-auto) is used as a placeholder for the return type of a function, it must be used by itself. It cannot be used as part of a pointer declaration (`decltype(auto)*`), a reference declaration (`decltype(auto)&`), or any other such qualification.

## Example

The following sample generates C3550:

```cpp
// C3550.cpp
// compile with: /c
decltype(auto)* func1(); // C3550
decltype(auto)& func2(); // C3550
decltype(auto)&& func3(); // C3550

auto* func4(); // OK
```

To resolve the error remove all illegal qualification on `decltype(auto)`. For instance, `decltype(auto)* func1()` can be turned into `auto* func1()`.

## See also

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