<commit_before>sockstream
==========<commit_msg>Add content to README.md.<commit_after>sockstream
==========

A C++ iostream implemented with a socket.

I created this to demonstrate polymorphism of C++ iostreams, which I had
always heard of as an advantage but not seen examples of. Most of the work is
in sockstreambuf, to override the various buffer and I/O methods. Then
sockstream just uses the sockstreambuf by passing it to init. It also exposes
a few socket-specific operations.
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