Hello.

I'm currently porting some Orocos 1.12.1 component code to 2.6. In the
original component we had a BufferPort with a variant type. This let us
pass multiple types through the same port. However when porting the
component to orocos 2.6 really strange (and long) compilation errors arise.
I've been scratching my head for a while now and I can't figure out what's
wrong with my code.

I managed to reproduce the error in a very simple test component. (See
attachment)

#ifndef OROCOS_VARIANTTEST_COMPONENT_HPP
#define OROCOS_VARIANTTEST_COMPONENT_HPP

#include <string>
#include <boost/variant/variant.hp

#include <rtt/RTT.hp

class VariantTest : public RTT::TaskContext{

public:
VariantTest(std::string const& name)
: RTT::TaskContext(name)
, _myPort()
{ }

private:
typedef boost::variant<int, std::string> MyVariant;
RTT::OutputPort<MyVariant> _myPort;
};
#endif

This throws the following compilation error... brace youselves! (Also
attached)

>In file included from
/home/jordanpalacios/oroComps/variantTest/src/variantTest-component.hpp:6:0,
from
/home/jordanpalacios/oroComps/variantTest/src/variantTest-component.cpp:1:
/usr/include/boost/variant/variant.hpp: In member function ‘void
boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13,
T14, T15, T16, T17, T18, T19>::convert_construct(T&, int, mpl_::false_)
[with T = const RTT::internal::RStore<boost::variant std::basic_string boost::detail::variant::void_, T3 = boost::detail::variant::void_, T4 =
boost::detail::variant::void_, T5 = boost::detail::variant::void_, T6 =
boost::detail::variant::void_, T7 = boost::detail::variant::void_, T8 =
boost::detail::variant::void_, T9 = boost::detail::variant::void_, T10 =
boost::detail::variant::void_, T11 = boost::detail::variant::void_, T12 =
boost::detail::variant::void_, T13 = boost::detail::variant::void_, T14 =
boost::detail::variant::void_, T15 = boost::detail::variant::void_, T16 =
boost::detail::variant::void_, T17 = boost::detail::variant::void_, T18 =
boost::detail::variant::void_, T19 = boost::detail::variant::void_,
mpl_::false_ = mpl_::bool_<false>]’:
/usr/include/boost/variant/variant.hpp:1373:9: instantiated from
‘boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13,
T14, T15, T16, T17, T18, T19>::variant(const T&) [with T =
RTT::internal::RStore<boost::variant = int, T1 = std::basic_string<char>, T2 = boost::detail::variant::void_, T3
= boost::detail::variant::void_, T4 = boost::detail::variant::void_, T5 =
boost::detail::variant::void_, T6 = boost::detail::variant::void_, T7 =
boost::detail::variant::void_, T8 = boost::detail::variant::void_, T9 =
boost::detail::variant::void_, T10 = boost::detail::variant::void_, T11 =
boost::detail::variant::void_, T12 = boost::detail::variant::void_, T13 =
boost::detail::variant::void_, T14 = boost::detail::variant::void_, T15 =
boost::detail::variant::void_, T16 = boost::detail::variant::void_, T17 =
boost::detail::variant::void_, T18 = boost::detail::variant::void_, T19 =
boost::detail::variant::void_]’
/usr/include/boost/variant/variant.hpp:1616:29: instantiated from ‘void
boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13,
T14, T15, T16, T17, T18, T19>::assign(const T&) [with T =
RTT::internal::RStore<boost::variant = int, T1 = std::basic_string<char>, T2 = boost::detail::variant::void_, T3
= boost::detail::variant::void_, T4 = boost::detail::variant::void_, T5 =
boost::detail::variant::void_, T6 = boost::detail::variant::void_, T7 =
boost::detail::variant::void_, T8 = boost::detail::variant::void_, T9 =
boost::detail::variant::void_, T10 = boost::detail::variant::void_, T11 =
boost::detail::variant::void_, T12 = boost::detail::variant::void_, T13 =
boost::detail::variant::void_, T14 = boost::detail::variant::void_, T15 =
boost::detail::variant::void_, T16 = boost::detail::variant::void_, T17 =
boost::detail::variant::void_, T18 = boost::detail::variant::void_, T19 =
boost::detail::variant::void_]’
/usr/include/boost/variant/variant.hpp:1626:9: instantiated from
‘boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13,
T14, T15, T16, T17, T18, T19>& boost::variant<T0, T1, T2, T3, T4, T5, T6,
T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18,
T19>::operator=(const T&) [with T =
RTT::internal::RStore<boost::variant = int, T1 = std::basic_string<char>, T2 = boost::detail::variant::void_, T3
= boost::detail::variant::void_, T4 = boost::detail::variant::void_, T5 =
boost::detail::variant::void_, T6 = boost::detail::variant::void_, T7 =
boost::detail::variant::void_, T8 = boost::detail::variant::void_, T9 =
boost::detail::variant::void_, T10 = boost::detail::variant::void_, T11 =
boost::detail::variant::void_, T12 = boost::detail::variant::void_, T13 =
boost::detail::variant::void_, T14 = boost::detail::variant::void_, T15 =
boost::detail::variant::void_, T16 = boost::detail::variant::void_, T17 =
boost::detail::variant::void_, T18 = boost::detail::variant::void_, T19 =
boost::detail::variant::void_, boost::variant<T0, T1, T2, T3, T4, T5, T6,
T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19> =
boost::variant<int, std::basic_string /usr/include/boost/fusion/container/vector/detail/vector_n.hpp:127:1:
instantiated from ‘typename
boost::disable_if<boost::is_convertible boost::fusion::vector1<T0>&>::type
boost::fusion::vector1<T0>::operator=(const Sequence&) [with Sequence =
boost::fusion::filter_view<const
boost::fusion::vector std::basic_string boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_>,
RTT::internal::is_arg_return<boost::remove_reference > > >, T0 = boost::variant<int, std::basic_string boost::disable_if<boost::is_convertible boost::fusion::vector1<T0>&>::type =
boost::fusion::vector1<boost::variant /usr/include/boost/fusion/container/vector/vector.hpp:86:13: instantiated
from ‘boost::fusion::vector<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>&
boost::fusion::vector<T0, T1, T2, T3, T4, T5, T6, T7, T8,
T9>::operator=(const T&) [with T = boost::fusion::filter_view<const
boost::fusion::vector std::basic_string boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_>,
RTT::internal::is_arg_return<boost::remove_reference > > >, T0 = boost::variant<int, std::basic_string boost::fusion::void_, T2 = boost::fusion::void_, T3 = boost::fusion::void_,
T4 = boost::fusion::void_, T5 = boost::fusion::void_, T6 =
boost::fusion::void_, T7 = boost::fusion::void_, T8 = boost::fusion::void_,
T9 = boost::fusion::void_, boost::fusion::vector<T0, T1, T2, T3, T4, T5,
T6, T7, T8, T9> = boost::fusion::vector<boost::variant std::basic_string boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_>]’
/opt/orocos/install/include/rtt/internal/../internal/LocalOperationCaller.hpp:224:21:
instantiated from ‘RTT::SendStatus
RTT::internal::LocalOperationCallerImpl<FunctionT>::collectIfDone_impl(T1&)
[with T1 = boost::variant<int, std::basic_string boost::variant<int, std::basic_string /opt/orocos/install/include/rtt/internal/../internal/Collect.hpp:116:55:
instantiated from ‘RTT::SendStatus RTT::internal::CollectImpl<1, Ft,
BaseImpl>::collectIfDone(RTT::internal::CollectImpl<1, Ft,
BaseImpl>::arg1_type) [with Ft = boost::variant<int,
std::basic_string BaseImpl = RTT::internal::LocalOperationCallerImpl<boost::variant std::basic_string BaseImpl>::arg1_type = boost::variant<int, std::basic_string /home/jordanpalacios/oroComps/variantTest/src/variantTest-component.cpp:16:1:
instantiated from here
/usr/include/boost/variant/variant.hpp:1300:9: error: no matching function
for call to
‘boost::detail::variant::make_initializer_node::apply<boost::mpl::pair mpl_::int_<0> >, boost::mpl::l_iter<boost::mpl::list2 std::basic_string RTT::internal::RStore<boost::variant /usr/include/boost/variant/detail/initializer.hpp:89:24: note: candidates
are: static int
boost::detail::variant::make_initializer_node::apply<BaseIndexPair,
Iterator>::initializer_node::initialize(void*,
boost::detail::variant::make_initializer_node::apply<BaseIndexPair,
Iterator>::initializer_node::param_T) [with BaseIndexPair =
boost::mpl::pair<boost::detail::variant::make_initializer_node::apply mpl_::int_<0> >, boost::mpl::l_iter<boost::mpl::list2 std::basic_string = boost::mpl::l_iter<boost::mpl::list1 boost::detail::variant::make_initializer_node::apply<BaseIndexPair,
Iterator>::initializer_node::param_T = const std::basic_string<char>&]
/usr/include/boost/variant/detail/initializer.hpp:122:17: note:
static void boost::detail::variant::initializer_root::initialize()
/usr/include/boost/variant/detail/initializer.hpp:89:24: note:
static int
boost::detail::variant::make_initializer_node::apply<BaseIndexPair,
Iterator>::initializer_node::initialize(void*,
boost::detail::variant::make_initializer_node::apply<BaseIndexPair,
Iterator>::initializer_node::param_T) [with BaseIndexPair =
boost::mpl::pair<boost::detail::variant::initializer_root, mpl_::int_<0> >,
Iterator = boost::mpl::l_iter<boost::mpl::list2 std::basic_string boost::detail::variant::make_initializer_node::apply<BaseIndexPair,
Iterator>::initializer_node::param_T = const int]
/usr/include/boost/variant/variant.hpp: In member function ‘void
boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13,
T14, T15, T16, T17, T18, T19>::convert_construct(T&, int, mpl_::false_)
[with T = const RTT::internal::AStore<boost::variant std::basic_string boost::detail::variant::void_, T3 = boost::detail::variant::void_, T4 =
boost::detail::variant::void_, T5 = boost::detail::variant::void_, T6 =
boost::detail::variant::void_, T7 = boost::detail::variant::void_, T8 =
boost::detail::variant::void_, T9 = boost::detail::variant::void_, T10 =
boost::detail::variant::void_, T11 = boost::detail::variant::void_, T12 =
boost::detail::variant::void_, T13 = boost::detail::variant::void_, T14 =
boost::detail::variant::void_, T15 = boost::detail::variant::void_, T16 =
boost::detail::variant::void_, T17 = boost::detail::variant::void_, T18 =
boost::detail::variant::void_, T19 = boost::detail::variant::void_,
mpl_::false_ = mpl_::bool_<false>]’:
/usr/include/boost/variant/variant.hpp:1373:9: instantiated from
‘boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13,
T14, T15, T16, T17, T18, T19>::variant(const T&) [with T =
RTT::internal::AStore<boost::variant = int, T1 = std::basic_string<char>, T2 = boost::detail::variant::void_, T3
= boost::detail::variant::void_, T4 = boost::detail::variant::void_, T5 =
boost::detail::variant::void_, T6 = boost::detail::variant::void_, T7 =
boost::detail::variant::void_, T8 = boost::detail::variant::void_, T9 =
boost::detail::variant::void_, T10 = boost::detail::variant::void_, T11 =
boost::detail::variant::void_, T12 = boost::detail::variant::void_, T13 =
boost::detail::variant::void_, T14 = boost::detail::variant::void_, T15 =
boost::detail::variant::void_, T16 = boost::detail::variant::void_, T17 =
boost::detail::variant::void_, T18 = boost::detail::variant::void_, T19 =
boost::detail::variant::void_]’
/usr/include/boost/variant/variant.hpp:1616:29: instantiated from ‘void
boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13,
T14, T15, T16, T17, T18, T19>::assign(const T&) [with T =
RTT::internal::AStore<boost::variant = int, T1 = std::basic_string<char>, T2 = boost::detail::variant::void_, T3
= boost::detail::variant::void_, T4 = boost::detail::variant::void_, T5 =
boost::detail::variant::void_, T6 = boost::detail::variant::void_, T7 =
boost::detail::variant::void_, T8 = boost::detail::variant::void_, T9 =
boost::detail::variant::void_, T10 = boost::detail::variant::void_, T11 =
boost::detail::variant::void_, T12 = boost::detail::variant::void_, T13 =
boost::detail::variant::void_, T14 = boost::detail::variant::void_, T15 =
boost::detail::variant::void_, T16 = boost::detail::variant::void_, T17 =
boost::detail::variant::void_, T18 = boost::detail::variant::void_, T19 =
boost::detail::variant::void_]’
/usr/include/boost/variant/variant.hpp:1626:9: instantiated from
‘boost::variant<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13,
T14, T15, T16, T17, T18, T19>& boost::variant<T0, T1, T2, T3, T4, T5, T6,
T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18,
T19>::operator=(const T&) [with T =
RTT::internal::AStore<boost::variant = int, T1 = std::basic_string<char>, T2 = boost::detail::variant::void_, T3
= boost::detail::variant::void_, T4 = boost::detail::variant::void_, T5 =
boost::detail::variant::void_, T6 = boost::detail::variant::void_, T7 =
boost::detail::variant::void_, T8 = boost::detail::variant::void_, T9 =
boost::detail::variant::void_, T10 = boost::detail::variant::void_, T11 =
boost::detail::variant::void_, T12 = boost::detail::variant::void_, T13 =
boost::detail::variant::void_, T14 = boost::detail::variant::void_, T15 =
boost::detail::variant::void_, T16 = boost::detail::variant::void_, T17 =
boost::detail::variant::void_, T18 = boost::detail::variant::void_, T19 =
boost::detail::variant::void_, boost::variant<T0, T1, T2, T3, T4, T5, T6,
T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19> =
boost::variant<int, std::basic_string /usr/include/boost/fusion/container/vector/detail/vector_n.hpp:127:1:
instantiated from ‘typename
boost::disable_if<boost::is_convertible boost::fusion::vector1<T0>&>::type
boost::fusion::vector1<T0>::operator=(const Sequence&) [with Sequence =
boost::fusion::filter_view<const
boost::fusion::vector RTT::internal::AStore<boost::variant boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_, boost::fusion::void_>,
RTT::internal::is_out_arg<boost::remove_reference > > >, T0 = boost::variant<int, std::basic_string boost::disable_if<boost::is_convertible boost::fusion::vector1<T0>&>::type =
boost::fusion::vector1<boost::variant /opt/orocos/install/include/rtt/internal/../internal/LocalOperationCaller.hpp:513:21:
instantiated from
‘RTT::internal::LocalOperationCallerImpl<FunctionT>::result_type
RTT::internal::LocalOperationCallerImpl<FunctionT>::ret_impl(T1) [with T1 =
boost::variant<int, std::basic_string RTT::FlowStatus(boost::variant<int, std::basic_string RTT::internal::LocalOperationCallerImpl<FunctionT>::result_type =
RTT::FlowStatus]’
/opt/orocos/install/include/rtt/internal/../internal/Invoker.hpp:100:67:
instantiated from ‘RTT::internal::InvokerImpl<1, F, BaseImpl>::result_type
RTT::internal::InvokerImpl<1, F,
BaseImpl>::ret(RTT::internal::InvokerImpl<1, F, BaseImpl>::arg1_type) [with
F = RTT::FlowStatus(boost::variant<int, std::basic_string BaseImpl =
RTT::internal::LocalOperationCallerImpl<RTT::FlowStatus(boost::variant std::basic_string BaseImpl>::result_type = RTT::FlowStatus, RTT::internal::InvokerImpl<1, F,
BaseImpl>::arg1_type = boost::variant<int, std::basic_string /home/jordanpalacios/oroComps/variantTest/src/variantTest-component.cpp:16:1:
instantiated from here
/usr/include/boost/variant/variant.hpp:1300:9: error: no matching function
for call to
‘boost::detail::variant::make_initializer_node::apply<boost::mpl::pair mpl_::int_<0> >, boost::mpl::l_iter<boost::mpl::list2 std::basic_string RTT::internal::AStore<boost::variant /usr/include/boost/variant/detail/initializer.hpp:89:24: note: candidates
are: static int
boost::detail::variant::make_initializer_node::apply<BaseIndexPair,
Iterator>::initializer_node::initialize(void*,
boost::detail::variant::make_initializer_node::apply<BaseIndexPair,
Iterator>::initializer_node::param_T) [with BaseIndexPair =
boost::mpl::pair<boost::detail::variant::make_initializer_node::apply mpl_::int_<0> >, boost::mpl::l_iter<boost::mpl::list2 std::basic_string = boost::mpl::l_iter<boost::mpl::list1 boost::detail::variant::make_initializer_node::apply<BaseIndexPair,
Iterator>::initializer_node::param_T = const std::basic_string<char>&]
/usr/include/boost/variant/detail/initializer.hpp:122:17: note:
static void boost::detail::variant::initializer_root::initialize()
/usr/include/boost/variant/detail/initializer.hpp:89:24: note:
static int
boost::detail::variant::make_initializer_node::apply<BaseIndexPair,
Iterator>::initializer_node::initialize(void*,
boost::detail::variant::make_initializer_node::apply<BaseIndexPair,
Iterator>::initializer_node::param_T) [with BaseIndexPair =
boost::mpl::pair<boost::detail::variant::initializer_root, mpl_::int_<0> >,
Iterator = boost::mpl::l_iter<boost::mpl::list2 std::basic_string boost::detail::variant::make_initializer_node::apply<BaseIndexPair,
Iterator>::initializer_node::param_T = const int]

Any help will be appreciated. Thanks for you time.

Jordán.