StringSource is using "new" operator. Should be deleting the memory or is it auto destroyed?

Hello,

I note an example code sample for b64encode(..).   I note that there are 
"new" calls inside the constructor(..).

The result is returned in the encoded string.

Do I need to do anything to delete the memory from the new calls ?

What happens to the memory in the variable "encoded", if the variable is 
passed up to another function and the StringSink is destroyed.

Should I make a copy of encoded and send it on to be safe ?


std::string b64encode(std::string str)
{
std::string encoded;
CryptoPP::StringSource(str, true,
new CryptoPP::Base64Encoder(
new CryptoPP::StringSink(encoded),
false 
)
);
return encoded;
}

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