Thanks for your input. Unfortunately; no dice. It still doesn't compile (below), and the error(also below) provides little insight in my relatively inexperienced assessment. I have a feeling that the enable_if mechanism is not behaving properly on my particular system. (the fact that others have successfully compiled this implies that the boost::function must have the correct signature to satisfy the enable_if....) ----error /usr/local/include/boost/asio/read_until.hpp: In instantiation of `boost::asio::detail::has_result_type<boost::function<std::pair<boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, bool> ()(boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>)> >': /usr/local/include/boost/asio/read_until.hpp:75: instantiated from `boost::asio::is_match_condition<boost::function<std::pair<boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, bool> ()(boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>)> >' /usr/local/include/boost/utility/enable_if.hpp:36: instantiated from `boost::enable_if<boost::asio::is_match_condition<boost::function<std::pair<boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, bool> ()(boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>)> >, void>' ../src/temp.cpp:56: instantiated from here /usr/local/include/boost/asio/read_until.hpp:60: error: call of overloaded `helper(const boost::function<std::pair<boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, bool> ()(boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>)>&)' is ambiguous /usr/local/include/boost/asio/read_until.hpp:57: note: candidates are: static boost::asio::detail::has_result_type<T>::big boost::asio::detail::has_result_type<T>::helper(U, ...) [with U = boost::function<std::pair<boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, bool> ()(boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>)>, T = boost::function<std::pair<boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, bool> ()(boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>)>] /usr/local/include/boost/asio/read_until.hpp:58: note: static char boost::asio::detail::has_result_type<T>::helper(U, typename U::result_type*) [with U = boost::function<std::pair<boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, bool> ()(boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>)>, T = boost::function<std::pair<boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, bool> ()(boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>)>] /usr/local/include/boost/asio/read_until.hpp:60: error: enumerator value for `value' not integer constant ../src/temp.cpp: In constructor `MyClass::MyClass()': ../src/temp.cpp:56: error: no matching function for call to `read_until(boost::asio::serial_port&, boost::asio::streambuf&, boost::function<std::pair<boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, bool> ()(boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>, boost::asio::buffers_iterator<boost::asio::const_buffers_1, char>)>&)' ----temp.cpp #include <boost/asio.hpp> #include <boost/bind.hpp> #include <boost/function.hpp> using namespace std; class MyClass { private: boost::asio::serial_port _port; boost::asio::io_service _service; boost::asio::streambuf _readBuffer; typedef boost::asio::buffers_iterator<boost::asio::streambuf::const_buffers_type> t_Iterator; typedef std::pair<t_Iterator, bool> t_ConditionPair; t_ConditionPair customCondition(t_Iterator i1, t_Iterator i2) { t_ConditionPair cond; return cond; } public: MyClass() : _port(_service, "/dev/ttyS0") { boost::function<t_ConditionPair(t_Iterator,t_Iterator)> cond = boost::bind( &MyClass::customCondition, this, _1, _2 ); boost::asio::read_until( _port, _readBuffer, cond ); }; virtual ~MyClass() { }; };
On Sat, Feb 20, 2010 at 10:56 AM, Igor R <boost.lists@gmail.com <mailto:boost.lists@gmail.com>> wrote:
> I'm having some trouble resolving the call to read_until > (see snippet below) > > Is there some reason I am not be able to use a boost::function > as the MatchCondition object?
It compiles well with MSVC9.0
As a workaround, try assigning the result of the bind to a boost::function<> object of the appropriate type first, and then passing that boost::function<> object by value into the asio method
Not sure if it will work, but if nothing else it might get the compiler to give you a different error and you can figure something out.
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