| 1 | g++ concept.cpp -o concept
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| 2 | /usr/include/boost/concept_check.hpp: In instantiation of 'boost::CopyConstructible<<unnamed>::MyVisitorAnon>':
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| 3 | /usr/include/boost/concept/detail/has_constraints.hpp:40: instantiated from 'const bool boost::concept::not_satisfied<boost::CopyConstructible<<unnamed>::MyVisitorAnon> >::value'
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| 4 | /usr/include/boost/concept/detail/has_constraints.hpp:43: instantiated from 'boost::concept::not_satisfied<boost::CopyConstructible<<unnamed>::MyVisitorAnon> >'
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| 5 | /usr/include/boost/mpl/if.hpp:67: instantiated from 'boost::mpl::if_<boost::concept::not_satisfied<boost::CopyConstructible<<unnamed>::MyVisitorAnon> >, boost::concept::constraint<boost::CopyConstructible<<unnamed>::MyVisitorAnon> >, boost::concept::requirement<boost::CopyConstructible<<unnamed>::MyVisitorAnon> > >'
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| 6 | /usr/include/boost/concept/detail/general.hpp:19: instantiated from 'boost::concept::requirement_<void (*)(boost::CopyConstructible<<unnamed>::MyVisitorAnon>)>'
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| 7 | /usr/include/boost/concept_check.hpp:43: instantiated from 'void boost::function_requires(Model*) [with Model = boost::CopyConstructible<<unnamed>::MyVisitorAnon>]'
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| 8 | concept.cpp:11: instantiated from here
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| 9 | /usr/include/boost/concept_check.hpp:156: error: 'boost::concept::requirement<Model>::failed [with Model = boost::concept::usage_requirements<boost::CopyConstructible<<unnamed>::MyVisitorAnon> >]' is not a valid template argument for type 'void (*)()' because function 'static void boost::concept::requirement<Model>::failed() [with Model = boost::concept::usage_requirements<boost::CopyConstructible<<unnamed>::MyVisitorAnon> >]' has not external linkage
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| 10 | /usr/include/boost/concept_check.hpp: In function 'void boost::function_requires(Model*) [with Model = boost::CopyConstructible<<unnamed>::MyVisitorAnon>]':
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| 11 | concept.cpp:11: instantiated from here
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| 12 | /usr/include/boost/concept_check.hpp:43: error: 'boost::concept::requirement<Model>::failed [with Model = boost::CopyConstructible<<unnamed>::MyVisitorAnon>]' is not a valid template argument for type 'void (*)()' because function 'static void boost::concept::requirement<Model>::failed() [with Model = boost::CopyConstructible<<unnamed>::MyVisitorAnon>]' has not external linkage
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| 13 | make: *** [concept] Error 1
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