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Compiler Error C3550

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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.

Example

The following sample generates C3550:

// 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

auto