getting error expression must have class type in c++ -

i getting following intellisense error:

expression must have class type f:\c++\prj\map1\map1\testmap1.cpp 11

which referring following line in code (shown in full below):

themap.insert(1, "one");

i cannot figure out issue is. not seem related declaration of themap, every time try call method on themap error. here code:

map1.h

#ifndef map_h     #define map_h     #include <list>     #include <utility>     using namespace std;  //pair class definition template<typename f, typename s> class pair { public: pair(const f& a, const s& b); f get_first() const; s get_second() const; private: f first; s second; };  template<typename f, typename s> inline pair<f, s>::pair(const f& a, const s& b):first(a),second(b){}  template<typename f, typename s> inline f pair<f, s>::get_first() const {     return first; }  template<typename f, typename s> inline s pair<f, s>::get_second() const {     return second; }  template<typename k, typename v> class map { public:     map();     void insert(const k& key, const v& value);     bool contain_key(const k& key);     v value_of(const k& key);     void remove_key(const k& key);     void print();  private:     list<pair<k, v>> thelist; };  template<typename k, typename v> inline map<k, v>::map():{}  template<typename k, typename v> inline void map<k, v>::insert(const k& key, const v& value) {     bool notthere = true;     if(contain_key(key))     {         notthere = false;     }     if(notthere)     {     thelist.push_back<pair<key, value>>     } }  template<typename k, typename v> inline bool map<k, v>::contain_key(const k& key) {     iterator iter = thelist.begin();     k temp;     for(int x=0 : x< thelist.size() ; x++)     {         temp = iter->first;         if(temp == key)         {             return true;         }         iter.advance();     }      return false; }  template<typename k, typename v> inline v map<k, v>::value_of(const k& key) {     iterator iter = thelist.begin();     k temp;     for(int x=0; x < thelist.size() ; x++)     {         temp = iter->first;             if(temp == key)             {                 return iter->second;             }     }     cout << “we don’t have key " << key << " in map” "\n";     return 0; }  template<typename k, typename v> inline void map<k, v>::remove_key(const k& key) {     iterator iter = thelist.begin();     k temp;     for(int x=0; x < thelist.size() ; x++)     {         temp = iter->first;         if(temp == key)         {             thelist.erase(iter)         }      } }  template<typename k, typename v> inline void map<k, v>::print() {     iterator iter = thelist.begin;     k temp;     v temp2;     for(int x=0; x < thelist.size() ; x++)     {         temp = iter->first;         temp2 = iter->second;         cout << "key:" << temp << " value:" << temp2 << "\n";     }    }  #endif; 

testmap1.cpp

#include "map1.h" #include <string> #include <iostream>  using namespace std;   int main() {     map<int, string> themap();     themap.insert(1, "one");     themap.insert(2, "two");     themap.insert(2, "double");     themap.insert(3, "three");      themap.print();      themap.remove_key(3);      cout << "please enter number" << "\n";     int temp;     cin >> temp;      bool contains = themap.contain_key(temp);     if(contains)     {         cout << themap.value_of(temp);     }     else     {         cout << "we don’t have key " << temp << " in map" << "\n";     }       return 0; } 

map<int, string> themap(); 

this declaring function themap not invoke default constructor of map

remove ()

map<int, string> themap/*()*/;