_Generic in C++ doesn't allow an elaborated type specifier as an association · Issue #55562 · llvm/llvm-project (original) (raw)

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Description

Clang supports _Generic as an extension in C++ mode, but the following C++ code doesn't parse when it should:

struct S { int i; };

void func(struct S s) { (void)_Generic(s, struct S : 1); // error: 'S' cannot be defined in a type specifier
error: expected class name
error: expected '{' after base class list

}

This use is not defining a new type specifier, it's attempting to use an elaborated type specifier for referencing the type.