Question

Hi i have the following code:

char msg[10000];
string mystr = "hello";
// stores mystr into msg
copy(mystr.begin(), mystr.end(), msg);

After the code copies, i want to clear the contents of char msg[10000]. How do i do that?

Answer 1

Using modern facilities

std::array<char, 10000> msg;

string mystr = "hello";
// stores mystr into msg
copy(mystr.begin(), mystr.end(), msg.begin());

// then clear it again
msg = {{}};

Not sure why you wanna copy it first and then clear it, but that’s how you can do it. Without C++11 generalized initializers, you can say

msg = std::array<char, 10000>();

Of course, you can always use boost::array instead std::array, it works the same.