Asynchronious IO and HTTP response streams use incompatible types

Question

I've been trying out the response streams but I'm vexed by the fact that stream returned by open_istream() isn't compatible with http_request::set_response_stream().

Here's what I currently do:

void get(http::http_request request) {
	http::http_response response(http::status_codes::OK);

	auto opened = async::fstream::open_istream(L"foo.txt");

	opened.then([=] (async::istream stream) mutable {

		static_assert(sizeof(char) == sizeof(async::byte),
			"We can only do the following cast if these "
			"two types match");

		auto byteStream = reinterpret_cast<async::basic_istream<async::byte>&>(stream);

		response.set_response_stream(byteStream);

		request.reply(response);
	});
}

Am I doing this wrong, or will this be cleaned up in a future release?

Answer 1

Hi Philip,

Yes, we are looking into the issue around byte streams and char streams.

For now, the following code could be used to hide the reinterpret cast (the library essentially does what you did above)

auto bytestream = async::basic_istream<async::byte>(stream.rdbuf());

Thank you,

--Krishnan (Microsoft)

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--Krishnan (Microsoft)

Answer 2

Thanks.

I am really enjoying using Casablanca! Keep up the great work :D