I am trying to initialise a std::map of std::set using boost::assign, as follows: typedef std::set< uint32_t > the_set_t; typedef std::map< uint32_t, the_set_t > the_map_t; the_map_t data = boost::assign::map_list_of< uint32_t, the_set_t > > // bad line ( 1, boost::assign::list_of(10)(20)(30) ) Unfortunately this is rejected by GCC 4.4.6, and results in a large amount of errors, (attached below). The problem is caused by the use of the typedef the_set_t. If the typedef is replaced with std::set the code compiles and works correctly. the_map_t data = boost::assign::map_list_of< uint32_t, std::set< uint32_t > > The error produced is as follows: map-assign.cpp:19: error: conversion from ‘bool’ to non-scalar type ‘the_map_t’ requested In file included from /opt/boost_1_51_0/boost/assign/list_of.hpp:397, from map-assign.cpp:7: /opt/boost_1_51_0/boost/preprocessor/iteration/detail/local.hpp: In member function ‘boost::assign_detail::generic_list<T>& boost::assign_detail::generic_list<T>::operator() (const U&, const U0&) [with U = int, U0 = boost::assign_detail::generic_list<int>, T = int]’: map-assign.cpp:17: instantiated from here /opt/boost_1_51_0/boost/preprocessor/iteration/detail/local.hpp:37: error: functional cast expression list treated as compound expression In file included from /opt/boost_1_51_0/boost/iterator/iterator_categories.hpp:15, from /opt/boost_1_51_0/boost/iterator/detail/facade_iterator_category.hpp:7, from /opt/boost_1_51_0/boost/iterator/iterator_facade.hpp:14, from /opt/boost_1_51_0/boost/range/iterator_range_core.hpp:23, from /opt/boost_1_51_0/boost/range/iterator_range.hpp:13, from /opt/boost_1_51_0/boost/assign/list_of.hpp:20, from map-assign.cpp:7: /opt/boost_1_51_0/boost/mpl/eval_if.hpp: At global scope: /opt/boost_1_51_0/boost/mpl/eval_if.hpp: In instantiation of ‘boost::mpl::eval_if_c, std::allocator<unsigned int> > > > (const unsigned int&, const std::set&)>, boost::range_mutable_iterator< boost::assign_detail::generic_list< std::pair, std::allocator<unsigned int> > > > (const unsigned int&, const std::set&)> >’: /opt/boost_1_51_0/boost/range/iterator.hpp:63: instantiated from ‘boost::range_iterator< boost::assign_detail::generic_list< std::pair, std::allocator<unsigned int> > > > (const unsigned int&, const std::set&)>’ /opt/boost_1_51_0/boost/range/iterator_range_core.hpp:72: instantiated from ‘bool boost::iterator_range_detail::less_than(const Left&, const Right&) [with Left = boost::assign_detail::converter< boost::assign_detail::generic_list<int>, std::_Deque_iterator >, Right = boost::assign_detail::generic_list< std::pair, std::allocator<unsigned int> > > > (const unsigned int&, const std::set&)]’ /opt/boost_1_51_0/boost/assign/list_of.hpp:274: instantiated from ‘bool boost::assign_detail::operator<(const boost::assign_detail::converter&, const Range&) [with T = boost::assign_detail::generic_list<int>, I = std::_Deque_iterator, Range = boost::assign_detail::generic_list< std::pair, std::allocator<unsigned int> > > > (const unsigned int&, const std::set&)]’ /opt/boost_1_51_0/boost/assign/list_of.hpp:292: instantiated from ‘bool boost::assign_detail::operator>(const Range&, const boost::assign_detail::converter&) [with T = boost::assign_detail::generic_list<int>, I = std::_Deque_iterator, Range = boost::assign_detail::generic_list< std::pair, std::allocator<unsigned int> > > > (const unsigned int&, const std::set&)]’ map-assign.cpp:19: instantiated from here /opt/boost_1_51_0/boost/mpl/eval_if.hpp:60: error: no type named ‘type’ in ‘struct boost::range_mutable_iterator< boost::assign_detail::generic_list< std::pair, std::allocator<unsigned int> > > > (const unsigned int&, const std::set&)>’ In file included from /opt/boost_1_51_0/boost/range/iterator_range.hpp:13, from /opt/boost_1_51_0/boost/assign/list_of.hpp:20, from map-assign.cpp:7: /opt/boost_1_51_0/boost/range/iterator_range_core.hpp: In function ‘bool boost::iterator_range_detail::less_than(const Left&, const Right&) [with Left = boost::assign_detail::converterboost::assign_detail::generic_list<int, std::_Deque_iterator >, Right = boost::assign_detail::generic_list, std::allocator<unsigned int> > > > (const unsigned int&, const std::set&)]’: /opt/boost_1_51_0/boost/assign/list_of.hpp:274: instantiated from ‘bool boost::assign_detail::operator<(const boost::assign_detail::converter&, const Range&) [with T = boost::assign_detail::generic_list<int>, I = std::_Deque_iterator, Range = boost::assign_detail::generic_list< std::pair, std::allocator<unsigned int> > > > (const unsigned int&, const std::set&)]’ /opt/boost_1_51_0/boost/assign/list_of.hpp:292: instantiated from ‘bool boost::assign_detail::operator>(const Range&, const boost::assign_detail::converter&) [with T = boost::assign_detail::generic_list<int>, I = std::_Deque_iterator, Range = boost::assign_detail::generic_list, std::allocator<unsigned int> > > > (const unsigned int&, const std::set&)]’ map-assign.cpp:19: instantiated from here /opt/boost_1_51_0/boost/range/iterator_range_core.hpp:72: error: no matching function for call to ‘begin(boost::assign_detail::generic_list< std::pair, std::allocator<unsigned int> > > > (&) (const unsigned int&, const std::set&))’ /opt/boost_1_51_0/boost/range/iterator_range_core.hpp:72: error: no matching function for call to ‘end(boost::assign_detail::generic_list< std::pair, std::allocator<unsigned int> > > > (&) (const unsigned int&, const std::set&))’ In file included from map-assign.cpp:7: /opt/boost_1_51_0/boost/assign/list_of.hpp: In member function ‘Container boost::assign_detail::converter::convert( const Container*, boost::assign_detail::default_type_tag) const [with Container = int, DerivedTAssign = boost::assign_detail::generic_list<int>, Iterator = std::_Deque_iterator]’: /opt/boost_1_51_0/boost/assign/list_of.hpp:142: instantiated from ‘Container boost::assign_detail::converter::convert_to_container() const [with Container = int, DerivedTAssign = boost::assign_detail::generic_list<int>, Iterator = std::_Deque_iterator]’ /opt/boost_1_51_0/boost/assign/list_of.hpp:436: instantiated from ‘boost::assign_detail::generic_list<T>::operator Container() const [with Container = int, T = int]’ /opt/boost_1_51_0/boost/preprocessor/iteration/detail/local.hpp:37: instantiated from ‘boost::assign_detail::generic_list<T>& boost::assign_detail::generic_list<T>::operator()(const U&, const U0&) [with U = int, U1 = boost::assign_detail::generic_list<int>, T = int]’ map-assign.cpp:17: instantiated from here /opt/boost_1_51_0/boost/assign/list_of.hpp:163: error: functional cast expression list treated as compound expression /opt/boost_1_51_0/boost/assign/list_of.hpp:163: error: invalid cast from type ‘std::_Deque_iterator’ to type ‘int’ What is wrong with using a typedef or is this a known limitation of `boost::assign`? -- View this message in context: http://boost.2283326.n4.nabble.com/Typedef-rejected-when-disambiguating-a-ca... 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