c++ - Boost Multiindex: Example compiles in cpp files but not in header -


i trying compile boost multiindex example

i have project consisting of multiple header , source files. when put following code source file works well, give me errors below, when code header file. both header , cpp include required boost header files , boost works fine otherwise.

i have never encountered such problem , quite confused reason be. 

// define multiply indexed set indices id , name typedef multi_index_container<   employee,   indexed_by<     // sort employee::operator<     ordered_unique<identity<employee> >,      // sort less<string> on name     ordered_non_unique<member<employee,std::string,&employee::name> >   >  > employee_set;

where employee simple struct.

void print_out_by_name(const employee_set& es)     {       // view index #1 (name)      const employee_set::nth_index<1>::type& name_index=es.get<1>();       // use name_index regular std::set     }

missing 'typename' prior dependent type name 'employee_set::nth_index' const employee_set::nth_index<1>::type& name_index=es.get<1>();

expected unqualified-id const employee_set::nth_index<1>::type& name_index=es.get<1>();

try

const typename employee_set::nth_index<1>::type& name_index=es.get<1>();

nth_index<1>::type called depended type. compiler doesn't know whether type of value or whatever. , writing typename tells him indeed type.


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