The article doesn't go in to much detail about why that class is really necessary. Couldn't you just loop the vector of strings, work out the total memory, then

The article doesn't go in to much detail about why that class is really necessary. Couldn't you just loop the vector of strings, work out the total memory, then `reserve()` exactly the right amount? Then all the concatenations should be fast. Alternatively `std::ostringstream` is specially designed for this type of task as well... how does it compare? Is it better/worse? Looks like reinventing the wheel to me.