Arbitrary byte padding with C++ TMP

padding.cpp

#include <type_traits>

template <typename T, size_t Amount, typename = void>
struct PaddedValImpl {
	PaddedValImpl(T&& t) : val(std::forward<T>(t)) {}
	T val;
};

template <typename T, size_t Amount>
struct PaddedValImpl <T, Amount
	, typename std::enable_if<Amount != 0>::type>
{
	PaddedValImpl(T&& t) : val(std::forward<T>(t)) {}
	T val;
	char padding[Amount] = {};
};

template <typename T, size_t PaddedTo>
struct PaddedVal : public PaddedValImpl<T, 63 - ((sizeof(T) - 1) % 64)> {
	operator T&() {
		return this->val;
	};
};

template <typename T> using Pad64 = PaddedVal<T, 64>;

#include <iostream>

int main() {

	std::cout << "sizeof(Pad64<char[0]>) == " << sizeof(Pad64<char[0]>) << std::endl;
	std::cout << "sizeof(Pad64<char[1]>) == " << sizeof(Pad64<char[1]>) << std::endl;
	std::cout << "sizeof(Pad64<char[31]>) == " << sizeof(Pad64<char[30]>) << std::endl;
	std::cout << "sizeof(Pad64<char[63]>) == " << sizeof(Pad64<char[63]>) << std::endl;
	std::cout << "sizeof(Pad64<char[64]>) == " << sizeof(Pad64<char[64]>) << std::endl;
	std::cout << "sizeof(Pad64<char[65]>) == " << sizeof(Pad64<char[65]>) << std::endl;

}