Directly write into char* buffer of std::string

Question

So I have an std::string and have a function which takes char* and writes into it. Since std::string::c_str() and std::string::data(

Answer 1

I don't know what you intend to do with that string, but if
all you need is a buffer of chars which frees its own memory automatically,
then I usually use vector or vector or whatever type
of buffer you need.

With v being the vector, it's guaranteed that &v[0] points to
a sequential memory which you can use as a buffer.