(Caveat: I've been unable to find anything about this; hopefully
haven't missed anything obvious.)
(Apology: I'm aware Coroutine has a new interface as of 1.55; I
haven't determined whether it is also affected.)
Given the following code:
#include <cassert>
#include
#include
using coro_t = boost::coroutines::coroutine< bool() >;
void get_a_bool( coro_t::caller_type& yield )
{
while (true)
yield(true);
}
int main()
{
coro_t producer( boost::bind(&get_a_bool, _1) );
assert( producer );
}
I get this error on compilation (g++ 4.8.2, Boost 1.54):
rob{code 0} 839# clear && g++ boost-coroutine-bool-return.cpp -g -W
-Wall --std=c++11 -L. -lboost_context -lboost_coroutine -o
boost-coroutine-bool-return
In file included from
/usr/include/boost/coroutine/v1/detail/coroutine_base_resume.hpp:26:0,
from
/usr/include/boost/coroutine/v1/detail/coroutine_base.hpp:21,
from /usr/include/boost/coroutine/v1/coroutine.hpp:30,
from /usr/include/boost/coroutine/coroutine.hpp:13,
from boost-coroutine-bool-return.cpp:11:
/usr/include/boost/coroutine/detail/holder.hpp: In instantiation of
‘struct boost::coroutines::detail::holder<bool>’:
/usr/include/boost/coroutine/v1/detail/coroutine_base_resume.hpp:103:28:
required from ‘void
boost::coroutines::detail::coroutine_base_resume::resume(boost::coroutines::detail::coroutine_base_resume::arg_type) [with Signature = void(bool); D =
boost::coroutines::detail::coroutine_base;
boost::coroutines::detail::coroutine_base_resume::arg_type = bool]’
/usr/include/boost/coroutine/v1/detail/coroutine_op.hpp:268:9:
required from ‘D& boost::coroutines::detail::coroutine_op::operator()(boost::coroutines::detail::coroutine_op::arg_type) [with Signature = void(bool); D =
boost::coroutines::coroutine;
boost::coroutines::detail::coroutine_op::arg_type = bool]’
boost-coroutine-bool-return.cpp:29:13: required from here
/usr/include/boost/coroutine/detail/holder.hpp:39:14: error:
‘boost::coroutines::detail::holder<Data>::holder(boost::coroutines::detail::coroutine_context*,
bool) [with Data = bool]’ cannot be overloaded
explicit holder( coroutine_context * ctx_, bool force_unwind_) :
^
/usr/include/boost/coroutine/detail/holder.hpp:35:14: error: with
‘boost::coroutines::detail::holder<Data>::holder(boost::coroutines::detail::coroutine_context*,
Data) [with Data = bool]’
explicit holder( coroutine_context * ctx_, Data data_) :
At a glance it looks like there's no way a coroutine-function could
possibly return bool due to the overload collision. Is this right? Did
I miss something completely obvious in the docs?
It's easy enough to work around with a transparent bool wrapper, I
just want to be sure I'm not being a muppet :-D
TIA -- rob
--
Rob Desbois
http://theotherbranch.wordpress.com/
