c++ - How to print the multimap elements having vector? -


i have created multimap.

multimap<int, std::vector<string> > mt;.

also have inserted elements using:

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

how print elements in multimap using key , value pair?

you can overwrite operator<< vector , multimap. printing code looked easier:

#include <iostream> #include <map> #include <vector> #include <string>  template< class t > std::ostream & operator << ( std::ostream & os, const std::vector< t > & v ) {     ( const auto & : v ) {         os << << std::endl;     }     return os; }  template< class k, class v > std::ostream & operator << ( std::ostream & os, const std::multimap< k, v > & m ) {     ( const auto & : m ) {         os << i.first << " : " << std::endl;         os << i.second << std::endl;     }     return os; }  int main() {     std::multimap<int, std::vector< std::string > > m;      m.insert(std::make_pair( 1, std::vector< std::string >( {"one", "two", "three" } ) ) );     m.insert(std::make_pair( 10, std::vector< std::string >( {"ten", "twenty", "thirty" } ) ) );     m.insert(std::make_pair( 42, std::vector< std::string >( {"foutry", "two" } ) ) );      std::cout << m; }

http://ideone.com/lkdptx

if don't want overwrite operator << (i'm wondering why...) can in place:

int main() {     std::multimap<int, std::vector< std::string > > m;      m.insert(std::make_pair( 1, std::vector< std::string >( {"one", "two", "three" } ) ) );     m.insert(std::make_pair( 10, std::vector< std::string >( {"ten", "twenty", "thirty" } ) ) );     m.insert(std::make_pair( 42, std::vector< std::string >( {"foutry", "two" } ) ) );      ( const auto & : m ) {         std::cout << i.first << " : " << std::endl;         ( const auto & i_v : i.second ) {             std::cout << i_v << std::endl;         }     } }

at last, if can't use c++11 (i'm wondering why...) can change code this:

int main() {     typedef std::vector< std::string > strings_t;     typedef std::multimap<int, strings_t > map_t;     map_t m;      {         strings_t v;         v.push_back( "one" ); v.push_back( "two" ); v.push_back( "three" );         m.insert( std::make_pair( 1, v ) );     }     {         strings_t v;         v.push_back( "ten" ); v.push_back( "twenty" ); v.push_back( "thirty" );         m.insert( std::make_pair( 10, v ) );     }     {         strings_t v;         v.push_back( "foutry" ); v.push_back( "two" );         m.insert( std::make_pair( 42, v ) );     }      ( map_t::const_iterator = m.begin(), e = m.end(); != e; ++i ) {         std::cout << i->first << " : " << std::endl;         ( strings_t::const_iterator i_v = i->second.begin(), e_v = i->second.end(); i_v != e_v; ++i_v ) {             std::cout << (*i_v) << std::endl;         }     } }

http://ideone.com/s80nlj


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