Reading directly from an std::istream into an std::string

Question

Is there anyway to read a known number of bytes, directly into an std::string, without creating a temporary buffer to do so?

eg currently I can do it by

Answer 1

An easy way would be:

std::istream& data
const size_t dataSize(static_cast(data.rdbuf()->in_avail()));
std::string content;
content.reserve( dataSize);
data.read(&content[0], dataSize);