c++ - recursive permutations using vector -

i have function suppose return possible permutation of integers inside vector. code based existing code permutation of strings, tried remodeled work on vectors apparently, dont work thought.. i'll appreciate offer thanks;

vector<vector<int>> permute(vector<int> &v1, vector<int> &v2){     vector<vector<int>> v;     if( v1.empty() )     {         v.push_back(v2);         return v;     }     for(auto = v1.begin(); != v1.end(); it++){         vector<int> temp1 = v1;         temp1.erase(it);          //there's runtime error on line         vector<int> temp2 = v2;         temp2.push_back(*it);          permute(temp1, temp2);     }       return v; } 

this original code permutes string.

void string_permutation( std::string& orig, std::string& perm )     {         if( orig.empty() )         {             std::cout<<perm<<std::endl;             return;         }          for(int i=0;i<orig.size();++i)         {             std::string orig2 = orig;              orig2.erase(i,1);              std::string perm2 = perm;              perm2 += orig.at(i);              string_permutation(orig2,perm2);         }      } 

here go:

   template < typename t>    void vec_permute( std::vector<t> &orig, std::vector<t> &perm)    {        if(orig.empty())        {             for( auto &x : perm)                 std::cout<<x;             std::cout<<"\n";             return;        }        for(typename std::vector<t>::size_type i=0;i <orig.size();++i)        {             std::vector<t> orig2(orig);             orig2.erase(std::find(orig2.begin(),orig2.end(),orig.at(i)));             std::vector<t> perm2(perm);             perm2.push_back(orig.at(i));             vec_permute(orig2,perm2);                    }    } 

demo: http://coliru.stacked-crooked.com/a/01ded4b778aa4165