c++ - error:cannot appear in constant expression while using multimap -

i writng program backtrace of process having multiple threads. using multimapping backtrace of each thread can mapped corresponding threadid.

here code:

     multimap<int,std::vector<strings >frames>> mt;

............ ............

mt.insert(pair<int,std::vector<string>(threadid,funcname));

when compiling getting error error:'threadid' cannot appear in constant expression error:'funcname' cannot appear in constant expression.

please me in assigning values multimap.

one obvious error missing 1 closing angular bracket. replace this:

mt.insert(pair<int,std::vector<string>(threadid,funcname));

with this:

mt.insert(pair<int,std::vector<string> >(threadid,funcname)); //                                     ^ here

you can simplify using std::make_pair function template:

mt.insert(std::make_pair(threadid, funcname));

DIs