help with boost function in std map

Hello

Why will the following code produce error:

Quote:

---

error C2664: 'std::_Tree<_Traits>::iterator std::_Tree<_Traits>::insert(std::_Tree<_Traits>::i terator,const std::pair<_Ty1,_Ty2> &)' : cannot convert parameter 1 from 'std::string' to 'std::_Tree<_Traits>::iterator'
1> with
1> [
1> _Traits=std::_Tmap_traits<std::string,user_input:: command_handler,std::less<std::string>,std::alloca tor<std::pair<const std::string,user_input::command_handler>>,false>,
1> _Ty1=const std::string,
1> _Ty2=user_input::command_handler
1> ]
1> and
1> [
1> _Traits=std::_Tmap_traits<std::string,user_input:: command_handler,std::less<std::string>,std::alloca tor<std::pair<const std::string,user_input::command_handler>>,false>
1> ]
1> No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called

---

Code:

---

class user_input {
public:
        user_input() {

        }

        class command_handler {
        public:
                command_handler() { }
                command_handler(
                        boost::program_options::options_description desc,
                        boost::function<void (boost::program_options::variables_map vars)> f) :
                                m_desc(desc), m_func(f) {
                                }


        private:
                boost::program_options::options_description m_desc;
                boost::function<void (variables_map vars)> m_func;
        };


        void add_function(std::string name, boost::program_options::options_description desc,
                boost::function<void (boost::program_options::variables_map vars)> func)
        {
                m_handlers.insert(name, command_handler(desc, func) );
        }

private:
        std::map<std::string, command_handler> m_handlers;
};

---

Many thanks for help!

The insert member function takes a single pair<string,command_handler> object as an argument, not separate/individual string/command_handler objects. Probably something like:

Code:

---

#include <utility>
...
m_handlers.insert( std::make_pair(name,command_handler(desc,func)) );

---

[edit]Or maybe you could have just done:

Code:

---

m_handlers[name] = command_handler(desc,func);

---

[/edit]