id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13291	read_until won't compile with Visual Studio 2017 using regex	Ville-Pekka Vahteala <vahtis@…>	chris_kohlhoff	"Compiling following code will produce compiler error
{{{
#include <boost/asio/io_service.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/read_until.hpp>
#include <boost/asio/streambuf.hpp>
#include <boost/regex.hpp>

int main() {
	boost::asio::io_service ios;
	boost::asio::ip::tcp::socket s(ios);
	boost::asio::streambuf b;
	boost::system::error_code e;
	boost::asio::read_until(s, b, boost::regex(""i am just a regex""), e);
}
}}}


{{{
1>d:\source\boost\boost\asio\impl\read_until.hpp(273): error C2664: 'size_t boost::asio::basic_streambuf<std::allocator<char>>::read_size_helper(boost::asio::basic_streambuf<std::allocator<char>> &,::size_t)': cannot convert argument 1 from 'boost::asio::basic_streambuf_ref<Allocator>' to 'boost::asio::basic_streambuf<std::allocator<char>> &'
1>        with
1>        [
1>            Allocator=std::allocator<char>
1>        ]
1>d:\source\boost\boost\asio\impl\read_until.hpp(404): note: see reference to function template instantiation 'size_t boost::asio::read_until<SyncReadStream,boost::asio::basic_streambuf_ref<Allocator>>(SyncReadStream &,DynamicBuffer &&,const boost::regex &,boost::system::error_code &)' being compiled
1>        with
1>        [
1>            SyncReadStream=boost::asio::ip::tcp::socket,
1>            Allocator=std::allocator<char>,
1>            DynamicBuffer=boost::asio::basic_streambuf_ref<std::allocator<char>>
1>        ]
1>c:\users\????\error.cpp(12): note: see reference to function template instantiation 'size_t boost::asio::read_until<boost::asio::ip::tcp::socket,std::allocator<char>>(SyncReadStream &,boost::asio::basic_streambuf<std::allocator<char>> &,const boost::regex &,boost::system::error_code &)' being compiled
1>        with
1>        [
1>            SyncReadStream=boost::asio::ip::tcp::socket
1>        ]
}}}

This can be solved by using same calculation as other methods use

{{{
    // Need more data.
	std::size_t bytes_to_read = std::min<std::size_t>(
		std::max<std::size_t>(512, b.capacity() - b.size()),
		std::min<std::size_t>(65536, b.max_size() - b.size()));

}}}

instead of

{{{
    std::size_t bytes_to_read = read_size_helper(b, 65536);

}}}
"	Bugs	new	To Be Determined	asio	Boost 1.66.0	Showstopper		asio, regex