Encrypting / obfuscating a string literal at compile-time

I want to encrypt/encode a string at compile time so that the original string does not appear in the compiled executable.

I've seen several examples but they can't take a string literal as argument. See the following example:

template<char c> struct add_three {
    enum { value = c+3 };
};

template <char... Chars> struct EncryptCharsA {
    static const char value[sizeof...(Chars) + 1];
};

template<char... Chars>
char const EncryptCharsA<Chars...>::value[sizeof...(Chars) + 1] = {
    add_three<Chars>::value...
};

int main() {   
    std::cout << EncryptCharsA<'A','B','C'>::value << std::endl;
    // prints "DEF"
}

I don't want to provide each character separately like it does. My goal is to pass a string literal like follows:

EncryptString<"String to encrypt">::value

There's also some examples like this one:

#define CRYPT8(str) { CRYPT8_(str "\0\0\0\0\0\0\0\0") }
#define CRYPT8_(str) (str)[0] + 1, (str)[1] + 2, (str)[2] + 3, (str)[3] + 4, (str)[4] + 5, (str)[5] + 6, (str)[6] + 7, (str)[7] + 8, '\0'

// calling it
const char str[] = CRYPT8("ntdll");

But it limits the size of the string.

Is there any way to achieve what I want?