Prefixing invalid variable definition with `struct` causes C template to compile-CodePudding

Home > database > Prefixing invalid variable definition with `struct` causes C template to compile

Prefixing invalid variable definition with `struct` causes C template to compile

Time：01-04

class Base {
  int i;
};

template <auto V>
struct Foo {
  int a;
};


int main()
{
    struct Foo<&Base::i> struct_foo;
    Foo<&Base::i> foo;
}

The fist line in main() compiles in gcc 12.2, but the second line doesn't compile. What is the reason?

CodePudding user response：

This seems to be a gcc bug as both statements should fail compilation(which they do with clang and msvc).