How about operator<<

[akimd]

Hi!

Well, this is not a feature request, it's just that I'm not sure what's the preferred place for discussions about hash_append.

I was wondering if you had considered using a stream-like syntax for hash_append. We are already familiar with it.

Thanks!

[HowardHinnant]

That syntax would make it more difficult for the class author to write the hash support for their class. They would have to do enable_if to restrict the HashAlgorithm template parameter from being a std::ostream-derived type, lest it get confused with the stream insertion code for their class.