https://github.com/neobrain/nihstro/issues/55

Scanning dependencies of target nihstro-assemble
[  4%] Building CXX object CMakeFiles/nihstro-assemble.dir/src/assembler.cpp.o
In file included from /home/liam/nihstro/include/nihstro/parser_assembly.h:39:0,
                 from /home/liam/nihstro/src/assembler.cpp:40:
/home/liam/nihstro/include/nihstro/source_tree.h: In member function ‘void nihstro::SourceTreeIterator::UpdateChildIterator()’:
/home/liam/nihstro/include/nihstro/source_tree.h:296:68: error: no match for ‘operator=’ (operand types are ‘boost::optional<boost::recursive_wrapper<nihstro::SourceTreeIterator> >’ and ‘nihstro::SourceTreeIterator’)
             child_iterator = SourceTreeIterator(node_iterator->tree);
                                                                    ^
In file included from /usr/local/include/boost/optional.hpp:15:0,
                 from /home/liam/nihstro/include/nihstro/parser_assembly.h:36,
                 from /home/liam/nihstro/src/assembler.cpp:40:
/usr/local/include/boost/optional/optional.hpp:902:5: note: candidate: template<class Expr> typename boost::enable_if<boost::optional_detail::is_optional_val_init_candidate<T, Expr>, boost::optional<T>&>::type boost::optional<T>::operator=(Expr&&) [with Expr = Expr; T = boost::recursive_wrapper<nihstro::SourceTreeIterator>]
     operator= ( Expr&& expr )
     ^~~~~~~~
/usr/local/include/boost/optional/optional.hpp:902:5: note:   template argument deduction/substitution failed:
/usr/local/include/boost/optional/optional.hpp: In substitution of ‘template<class Expr> typename boost::enable_if<boost::optional_detail::is_optional_val_init_candidate<T, Expr>, boost::optional<T>&>::type boost::optional<T>::operator=(Expr&&) [with Expr = nihstro::SourceTreeIterator]’:
/home/liam/nihstro/include/nihstro/source_tree.h:296:68:   required from here
/usr/local/include/boost/optional/optional.hpp:902:5: error: no type named ‘type’ in ‘struct boost::enable_if<boost::optional_detail::is_optional_val_init_candidate<boost::recursive_wrapper<nihstro::SourceTreeIterator>, nihstro::SourceTreeIterator>, boost::optional<boost::recursive_wrapper<nihstro::SourceTreeIterator> >&>’
/usr/local/include/boost/optional/optional.hpp:922:15: note: candidate: template<class U> boost::optional<T>& boost::optional<T>::operator=(const boost::optional<U>&) [with U = U; T = boost::recursive_wrapper<nihstro::SourceTreeIterator>]
     optional& operator= ( optional<U> const& rhs )
               ^~~~~~~~
/usr/local/include/boost/optional/optional.hpp:922:15: note:   template argument deduction/substitution failed:
In file included from /home/liam/nihstro/include/nihstro/parser_assembly.h:39:0,
                 from /home/liam/nihstro/src/assembler.cpp:40:
/home/liam/nihstro/include/nihstro/source_tree.h:296:68: note:   ‘nihstro::SourceTreeIterator’ is not derived from ‘const boost::optional<T>’
             child_iterator = SourceTreeIterator(node_iterator->tree);
                                                                    ^
In file included from /usr/local/include/boost/optional.hpp:15:0,
                 from /home/liam/nihstro/include/nihstro/parser_assembly.h:36,
                 from /home/liam/nihstro/src/assembler.cpp:40:
/usr/local/include/boost/optional/optional.hpp:933:15: note: candidate: template<class U> boost::optional<T>& boost::optional<T>::operator=(boost::optional<U>&&) [with U = U; T = boost::recursive_wrapper<nihstro::SourceTreeIterator>]
     optional& operator= ( optional<U> && rhs )
               ^~~~~~~~
/usr/local/include/boost/optional/optional.hpp:933:15: note:   template argument deduction/substitution failed:
In file included from /home/liam/nihstro/include/nihstro/parser_assembly.h:39:0,
                 from /home/liam/nihstro/src/assembler.cpp:40:
/home/liam/nihstro/include/nihstro/source_tree.h:296:68: note:   ‘nihstro::SourceTreeIterator’ is not derived from ‘boost::optional<T>’
             child_iterator = SourceTreeIterator(node_iterator->tree);
                                                                    ^
In file included from /usr/local/include/boost/optional.hpp:15:0,
                 from /home/liam/nihstro/include/nihstro/parser_assembly.h:36,
                 from /home/liam/nihstro/src/assembler.cpp:40:
/usr/local/include/boost/optional/optional.hpp:943:15: note: candidate: boost::optional<T>& boost::optional<T>::operator=(const boost::optional<T>&) [with T = boost::recursive_wrapper<nihstro::SourceTreeIterator>]
     optional& operator= ( optional const& rhs )
               ^~~~~~~~
/usr/local/include/boost/optional/optional.hpp:943:15: note:   no known conversion for argument 1 from ‘nihstro::SourceTreeIterator’ to ‘const boost::optional<boost::recursive_wrapper<nihstro::SourceTreeIterator> >&’
/usr/local/include/boost/optional/optional.hpp:951:15: note: candidate: boost::optional<T>& boost::optional<T>::operator=(boost::optional<T>&&) [with T = boost::recursive_wrapper<nihstro::SourceTreeIterator>]
     optional& operator= ( optional && rhs )
               ^~~~~~~~
/usr/local/include/boost/optional/optional.hpp:951:15: note:   no known conversion for argument 1 from ‘nihstro::SourceTreeIterator’ to ‘boost::optional<boost::recursive_wrapper<nihstro::SourceTreeIterator> >&&’
/usr/local/include/boost/optional/optional.hpp:964:5: note: candidate: template<class T_> typename boost::enable_if<boost::is_same<T, typename boost::decay<T_>::type>, boost::optional<T>&>::type boost::optional<T>::operator=(T_&&) [with T_ = T_; T = boost::recursive_wrapper<nihstro::SourceTreeIterator>]
     operator= ( T_&& val )
     ^~~~~~~~
/usr/local/include/boost/optional/optional.hpp:964:5: note:   template argument deduction/substitution failed:
/usr/local/include/boost/optional/optional.hpp: In substitution of ‘template<class T_> typename boost::enable_if<boost::is_same<T, typename boost::decay<T_>::type>, boost::optional<T>&>::type boost::optional<T>::operator=(T_&&) [with T_ = nihstro::SourceTreeIterator]’:
/home/liam/nihstro/include/nihstro/source_tree.h:296:68:   required from here
/usr/local/include/boost/optional/optional.hpp:964:5: error: no type named ‘type’ in ‘struct boost::enable_if<boost::is_same<boost::recursive_wrapper<nihstro::SourceTreeIterator>, nihstro::SourceTreeIterator>, boost::optional<boost::recursive_wrapper<nihstro::SourceTreeIterator> >&>’
/usr/local/include/boost/optional/optional.hpp:994:15: note: candidate: boost::optional<T>& boost::optional<T>::operator=(boost::none_t) [with T = boost::recursive_wrapper<nihstro::SourceTreeIterator>]
     optional& operator= ( none_t none_ ) BOOST_NOEXCEPT
               ^~~~~~~~
/usr/local/include/boost/optional/optional.hpp:994:15: note:   no known conversion for argument 1 from ‘nihstro::SourceTreeIterator’ to ‘boost::none_t’
CMakeFiles/nihstro-assemble.dir/build.make:62: recipe for target 'CMakeFiles/nihstro-assemble.dir/src/assembler.cpp.o' failed
make[2]: *** [CMakeFiles/nihstro-assemble.dir/src/assembler.cpp.o] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/nihstro-assemble.dir/all' failed
make[1]: *** [CMakeFiles/nihstro-assemble.dir/all] Error 2
Makefile:138: recipe for target 'all' failed
make: *** [all] Error 2