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#include <iostream>
using namespace std;
 
template <typename T, std::size_t... Sizes>
class Foo {
public:
	const std::size_t rank = sizeof...(Sizes);
	const std::size_t dimensions[sizeof...(Sizes)] = {Sizes...};
};
 
int main() {
 
	Foo<int, 1, 2, 3> foo;
 
	std::cout << "Rank: " << foo.rank << std::endl;
 
	return 0;
}

prog.cpp:7:27: error: expected ‘;’ at end of member declaration
  const std::size_t rank = sizeof...(Sizes);
                           ^
prog.cpp:7:33: error: expected unqualified-id before ‘...’ token
  const std::size_t rank = sizeof...(Sizes);
                                 ^
prog.cpp:7:27: error: expected primary-expression at end of input
  const std::size_t rank = sizeof...(Sizes);
                           ^

Standard output is empty