Error to convert to boost::asio::streambuf to raw buffer char *buffer - Boost - lists.stage.boost.cppalliance.org

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Error to convert to boost::asio::streambuf to raw buffer char *buffer

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hh h

16 Dec 2018 16 Dec '18

4:19 a.m.

boost::asio::streambuf sb; char *raw = sb; error: cannot convert ‘boost::asio::streambuf {aka boost::asio::basic_streambuf<>}’ to ‘char*’ in initialization I've checked the boost::asio::streambuf reference, but could not find anything to fix it, appreciate any clues.

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Steven Watanabe

18 Dec 18 Dec

12:41 a.m.

AMDG On 12/15/2018 09:19 PM, hh h via Boost wrote:

boost::asio::streambuf sb; char *raw = sb;

error: cannot convert ‘boost::asio::streambuf {aka boost::asio::basic_streambuf<>}’ to ‘char*’ in initialization

I've checked the boost::asio::streambuf reference, but could not find anything to fix it, appreciate any clues.

asio::streambuf doesn't necessarily store contiguous data, so this can't work as is. The closest approximation to what you're asking for is: https://www.boost.org/doc/html/boost_asio/reference/basic_streambuf/data.htm... In Christ, Steven Watanabe

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Vinnie Falco

12:57 a.m.

On Mon, Dec 17, 2018 at 4:41 PM Steven Watanabe via Boost wrote:

asio::streambuf doesn't necessarily store contiguous data, so this can't work as is.

Actually it does, and you can simply write: boost::beast::buffers_front(streambuf.data()); To retrieve a const_buffer to the first (and only) buffer in the data. Thanks

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hh h

10:08 a.m.

The beast does not seem included in 1.65 which I am running on Ubuntu 18, looks like a simple alternative is to use array as I know the packet size to read from the async_read, the msgpack::unpack should be happy with the array. Thank you very much. On 12/18/18, Vinnie Falco via Boost wrote:

On Mon, Dec 17, 2018 at 4:41 PM Steven Watanabe via Boost wrote:

...
asio::streambuf doesn't necessarily store contiguous data, so this can't work as is.

Actually it does, and you can simply write:

boost::beast::buffers_front(streambuf.data());

To retrieve a const_buffer to the first (and only) buffer in the data.

Thanks

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hh h
Steven Watanabe
Vinnie Falco